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Say “hi”
to
zsmb.co zsmb13
Márton Braun
Moshi
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@zsmb13
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Serialization
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JSON
Serialization
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JSON
Serialization
on the JVM
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Gson
github.com/google/gson
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Gson 101
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Gson 101
val burger: Burger = Gson().fromJson("{...}", Burger::class.java)
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Gson 101
val burger: Burger = Gson().fromJson("{...}", Burger::class.java)
val json: String = Gson().toJson(Burger())
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Gson 101
val burger: Burger = Gson().fromJson("{...}", Burger::class.java)
val json: String = Gson().toJson(Burger())
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Gson 101
val burger: Burger = Gson().fromJson("{...}", Burger::class.java)
val json: String = Gson().toJson(Burger())
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Gson 101
val gson = Gson()
val burger: Burger = Gson().fromJson("{...}", Burger::class.java)
val json: String = Gson().toJson(Burger())
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Gson 101
val gson = Gson()
val burger: Burger = gson.fromJson("{...}", Burger::class.java)
val json: String = gson.toJson(Burger())
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Gson
val gson = Gson()
val burger: Burger = gson.fromJson("{...}", Burger::class.java)
val json: String = gson.toJson(Burger())
101
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Gson
val gson = Gson()
: built-in types
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Gson
val gson = Gson()
gson.toJson(Date())
: built-in types
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"Oct 29, 2021 : : PM"
04 08
9
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Gson
val gson = Gson()
gson.toJson(Date())
"Oct 29, 2021 : : PM"
: built-in types
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9
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Gson
val gson = Gson()
gson.toJson(Date())
"Oct 29, 2021 : : PM"
: built-in types
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gson.toJson(Calendar.getInstance())
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{"year":2021,"month":9,"dayOfMonth":29,"hourOfDay":
"minute": ,"second": }
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Gson
val gson = Gson()
gson.toJson(Date())
"Oct 29, 2021 : : PM"
gson.toJson(Calendar.getInstance())
{"year":2021,"month":9,"dayOfMonth":29,"hourOfDay":
"minute": ,"second": }
: built-in types
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,
21
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Gson
val gson = Gson()
gson.toJson(Date())
"Oct 29, 2021 : : PM"
gson.toJson(Calendar.getInstance())
{"year":2021,"month":9,"dayOfMonth":29,"hourOfDay":
"minute": ,"second": }
: built-in types
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,
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gson.toJson(Random())
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Gson
val gson = Gson()
gson.toJson(Date())
"Oct 29, 2021 : : PM"
gson.toJson(Calendar.getInstance())
{"year":2021,"month":9,"dayOfMonth":29,"hourOfDay":
"minute": ,"second": }
: built-in types
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gson.toJson(Random())
{"seed":{"value":137564286790437},"nextNextGaussian":0.0,
"haveNextNextGaussian":false}
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Gson: field naming
val gson = Gson()
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Gson: field naming
val gson = GsonBuilder()
.create()
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val gson = GsonBuilder()
.setFieldNamingPolicy(
FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
Gson: field naming
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val gson = GsonBuilder()
.setFieldNamingPolicy(
FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
Gson: field naming
data class Burger(
val name: String,
val totalCost: Int,
val salesPrice: Int
)
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val gson = GsonBuilder()
.setFieldNamingPolicy(
FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
Gson: field naming
data class Burger(
val name: String,
val totalCost: Int,
val salesPrice: Int
)
gson.toJson(Burger("Classic", 10, 13))
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val gson = GsonBuilder()
.setFieldNamingPolicy(
FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
Gson: field naming
data class Burger(
val name: String,
val totalCost: Int,
val salesPrice: Int
)
gson.toJson(Burger("Classic", 10, 13))
{"name":"Classic","total_cost":10,"sales_price":13}
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GsonBuilder()
.setFieldNamingPolicy(
FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
Gson: field naming
gson.toJson(Burger("Classic", 10, 13))
{"name":"Classic","total_cost":10,"sales_price":13}
val gson =
data class Burger(
val name: String,
val totalCost: Int,
val salesPrice: Int
)
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@SerializedName("name")
@SerializedName("total_cost")
@SerializedName("sales_price")
Gson()
Gson: field naming
gson.toJson(Burger("Classic", 10, 13))
{"name":"Classic","total_cost":10,"sales_price":13}
data class Burger(
val gson =
val name: String,
val totalCost: Int,
)
val salesPrice: Int
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Gson: missing data
Gson()
val gson =
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data class Burger(
val name: String,
val price: Int
)
Gson: missing data
Gson()
val gson =
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data class Burger(
val name: String,
val price: Int
)
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
Gson()
val gson =
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data class Burger(
val name: String,
val price: Int
)
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
Burger(name=Cheeseburger, price=0)
Gson()
val gson =
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data class Burger(
val name: String,
val description: String
)
val gson = Gson()
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
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data class Burger(
val name: String,
val description: String
)
val gson = Gson()
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
Burger(name=Cheeseburger, description=null)
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data class Burger(
val name: String,
val description: String = "One of our best burgers!"
)
val gson = Gson()
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
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data class Burger(
val name: String,
val description: String = "One of our best burgers!"
)
val gson = Gson()
Gson: missing data
val burger = gson.fromJson("{\"name\": \"Cheeseburger\"}",
Burger::class.java)
Burger(name=Cheeseburger, description=null)
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val gson = Gson()
Gson: malformed data
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
val restaurant = gson.fromJson(json, Restaurant::class.java)
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Gson: malformed data
val gson = Gson()
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
val restaurant = gson.fromJson(json, Restaurant::class.java)
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: "crocodile"
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
val restaurant = gson.fromJson(json, Restaurant::class.java)
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: "crocodile"
@zsmb13
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val gson = Gson()
Gson: malformed data
data class Burger(val name: String, val price: Int)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "" }
]
}"""
val restaurant = gson.fromJson(json, Restaurant::class.java)
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: ""
@zsmb13
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No content
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Say “hi”
to
zsmb.co zsmb13
Márton Braun
Moshi
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Moshi
github.com/square/moshi
@zsmb13
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Okio
github.com/square/okio
Retrofit
github.com/square/retrofit
Moshi
github.com/square/moshi
OkHttp
github.com/square/okhttp
@zsmb13
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Moshi
github.com/square/moshi
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Moshi 101
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Moshi 101
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
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public JavaBurger(String name, int price) {
this.name = name;
this.price = price;
}
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getPrice() { return price; }
public void setPrice(int price) { this.price = price; }
Moshi 101
}
public class JavaBurger {
private String name;
private int price;
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// ...
public JavaBurger(String name, int price) {
this.name = name;
this.price = price;
}
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getPrice() { return price; }
public void setPrice(int price) { this.price = price; }
Moshi 101
}
public class JavaBurger {
private String name;
private int price;
@zsmb13
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// ...
public JavaBurger(String name, int price) {
this.name = name;
this.price = price;
}
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getPrice() { return price; }
public void setPrice(int price) { this.price = price; }
Moshi 101
val moshi = Moshi.Builder().build()
}
public class JavaBurger {
private String name;
private int price;
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// ...
public JavaBurger(String name, int price) {
this.name = name;
this.price = price;
}
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getPrice() { return price; }
public void setPrice(int price) { this.price = price; }
Moshi 101
val moshi = Moshi.Builder().build()
val json = moshi.toJson(JavaBurger("Classic", 10))
}
public class JavaBurger {
private String name;
private int price;
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// ...
Moshi 101
val moshi = Moshi.Builder().build()
val json = moshi.toJson(JavaBurger("Classic", 10))
}
public class JavaBurger {
private String name;
private int price;
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// ...
Moshi 101
val moshi = Moshi.Builder().build()
val json = moshi.toJson(JavaBurger("Classic", 10))
}
public class JavaBurger {
private String name;
private int price;
val burgerAdapter: JsonAdapter =
moshi.adapter(JavaBurger::class.java)
@zsmb13
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// ...
Moshi 101
val moshi = Moshi.Builder().build()
}
public class JavaBurger {
private String name;
private int price;
val burgerAdapter: JsonAdapter =
moshi.adapter(JavaBurger::class.java)
val json = burgerAdapter.toJson(JavaBurger("Classic", 10))
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// ...
Moshi 101
val moshi = Moshi.Builder().build()
}
public class JavaBurger {
private String name;
private int price;
val burgerAdapter: JsonAdapter =
moshi.adapter(JavaBurger::class.java)
val json = burgerAdapter.toJson(JavaBurger("Classic", 10))
{"name":"Classic","price":10}
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// ...
Moshi 101
val moshi = Moshi.Builder().build()
}
public class JavaBurger {
private String name;
private int price;
val burgerAdapter: JsonAdapter =
moshi.adapter(JavaBurger::class.java)
val json = burgerAdapter.toJson(JavaBurger("Classic", 10))
{"name":"Classic","price":10}
val burger = burgerAdapter.fromJson(json)
@zsmb13
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Burger::class.java)
// ...
val moshi = Moshi.Builder().build()
}
public Java {
private String ;
private int ;
Java
val json = burgerAdapter.toJson(JavaBurger("Classic", 10))
{"name":"Classic","price":10}
val burger = burgerAdapter.fromJson(json)
Burger
class
val burgerAdapter: JsonAdapter< Burger> =
moshi.adapter(Java
name
price
@zsmb13
Moshi 101
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Burger::class.java)
val moshi = Moshi.Builder().build()
(val : String, val : Int)
val burgerAdapter: JsonAdapter =
moshi.adapter(
Burger
class name price
@zsmb13
Moshi ft. Kotlin
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Burger::class.java)
val moshi = Moshi.Builder().build()
(val : String, val : Int)
val burgerAdapter: JsonAdapter =
moshi.adapter(
Burger
class name price
Moshi ft. Kotlin
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the moshi-kotlin-
codegen artifact.
@zsmb13
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Moshi ft. Kotlin
val moshi = Moshi.Builder().build()
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the moshi-kotlin-
codegen artifact.
@zsmb13
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Moshi ft. Kotlin
val moshi = Moshi.Builder().build()
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the moshi-kotlin-
codegen artifact.
@zsmb13
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val moshi = Moshi.Builder().build()
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
Moshi ft. Kotlin
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the moshi-kotlin-
codegen artifact.
@zsmb13
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val moshi = Moshi.Builder().build()
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
@zsmb13
Moshi: reflection
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val moshi = Moshi.Builder().build()
Moshi: reflection
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
@zsmb13
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val moshi = Moshi.Builder()
Moshi: reflection
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
.build()
@zsmb13
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Moshi: reflection
.add(KotlinJsonAdapterFactory())
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
.build()
val moshi = Moshi.Builder()
@zsmb13
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Moshi: reflection
.add(KotlinJsonAdapterFactory())
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
val json = burgerAdapter.toJson(Burger("Classic", 10))
.build()
val moshi = Moshi.Builder()
@zsmb13
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Moshi: reflection
.add(KotlinJsonAdapterFactory())
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
val json = burgerAdapter.toJson(Burger("Classic", 10))
.build()
val moshi = Moshi.Builder()
@zsmb13
{"name":"Classic","price":10}
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Moshi: reflection
.add(KotlinJsonAdapterFactory())
val burgerAdapter: JsonAdapter =
moshi.adapter(Burger::class.java)
class Burger(val name: String, val price: Int)
val json = burgerAdapter.toJson(Burger("Classic", 10))
.build()
val moshi = Moshi.Builder()
@zsmb13
{"name":"Classic","price":10}
val burger = burgerAdapter.fromJson(json)
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Moshi: reflection
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
@zsmb13
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Moshi: reflection
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the moshi-kotlin-
codegen artifact.
@zsmb13
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implementation moshi-kotlin:$moshi_version"
"com.squareup.moshi:
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
Moshi: reflection
Exception in thread "main"
java.lang.IllegalArgumentException:
Cannot serialize Kotlin type
com.example.Burger. Reflective
serialization of Kotlin classes
without using kotlin-reflect has
undefined and unexpected behavior.
Please use KotlinJsonAdapter from
the moshi-kotlin artifact or use
code gen from the
artifact.
moshi-kotlin-
@zsmb13
codegen
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def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
kapt moshi-kotlin-codegen:$moshi_version"
"com.squareup.moshi:
@zsmb13
Moshi: codegen
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Moshi: codegen
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
@zsmb13
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dependencies {
}
Moshi: codegen
apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
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Moshi: codegen
class Burger(val name: String, val price: Int)
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@JsonClass(generateAdapter = true)
class Burger(val name: String, val price: Int)
@zsmb13
Moshi: codegen
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@JsonClass(generateAdapter = true)
class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val json = burgerAdapter.toJson(Burger("Double", 18)))
@zsmb13
Moshi: codegen
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dependencies {
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
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Moshi: mixed use
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Moshi: mixed use
dependencies {
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
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dependencies {
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
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Moshi: mixed use
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class CustomBurgerAdapter {
TODO("Implement deserialization")
@ToJson
fun toJson(writer: JsonWriter, value: Burger?) {
TODO("Implement serialization")
}
}
@FromJson
fun fromJson(reader: JsonReader): Burger? {
}
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Moshi: custom adapters
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@FromJson
fun fromJson(reader: JsonReader): Burger? {
}
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Moshi: custom adapters
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Moshi: custom adapters
@FromJson
fun fromJson(reader: JsonReader): Burger? {
var name: String? = null
var price: Int? = null
}
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Moshi: custom adapters
@FromJson
fun fromJson(reader: JsonReader): Burger? {
var name: String? = null
var price: Int? = null
reader.beginObject()
reader.endObject()
}
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Moshi: custom adapters
@FromJson
fun fromJson(reader: JsonReader): Burger? {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
}
reader.endObject()
}
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Moshi: custom adapters
@FromJson
fun fromJson(reader: JsonReader): Burger? {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.nextName()) {
"name" -> name = reader.nextString()
"price" -> price = reader.nextInt()
else -> reader.skipValue()
}
}
reader.endObject()
}
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@FromJson
fun fromJson(reader: JsonReader): Burger? {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.nextName()) {
"name" -> name = reader.nextString()
"price" -> price = reader.nextInt()
else -> reader.skipValue()
}
}
reader.endObject()
return Burger(name!!, price!!)
}
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: custom adapters
Moshi
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class BurgerJsonAdapter(
moshi: Moshi
) : JsonAdapter() {
override fun toString(): String = buildString(28) {
append("GeneratedJsonAdapter(").append("Burger").append(')')
}
private val options: JsonReader.Options =
JsonReader.Options.of("name", "price")
private val stringAdapter: JsonAdapter =
moshi.adapter(String::class.java, emptySet(), "name")
private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
return Burger(
name = name ?:
throw Util.missingProperty("name", "name", reader),
price = price ?:
throw Util.missingProperty("price", "price", reader)
)
}
override fun toJson(writer: JsonWriter, value: Burger?) {
if (value == null) {
throw NullPointerException(
"value was null! Wrap in .nullSafe() to write nullable values.")
}
writer.beginObject()
writer.name("name")
stringAdapter.toJson(writer, value.name)
writer.name("price")
intAdapter.toJson(writer, value.price)
writer.endObject()
}
}
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Moshi’s generated adapter
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class BurgerJsonAdapter(
moshi: Moshi
) : JsonAdapter() {
override fun toString(): String = buildString(28) {
append("GeneratedJsonAdapter(").append("Burger").append(')')
}
private val options: JsonReader.Options =
JsonReader.Options.of("name", "price")
private val stringAdapter: JsonAdapter =
moshi.adapter(String::class.java, emptySet(), "name")
private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
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Moshi’s generated adapter
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class BurgerJsonAdapter(
moshi: Moshi
) : JsonAdapter() {
override fun toString(): String = buildString(28) {
append("GeneratedJsonAdapter(").append("Burger").append(')')
}
private val options: JsonReader.Options =
JsonReader.Options.of("name", "price")
private val stringAdapter: JsonAdapter =
moshi.adapter(String::class.java, emptySet(), "name")
private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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override fun toString(): String = buildString(28) {
append("GeneratedJsonAdapter(").append("Burger").append(')')
}
private val options: JsonReader.Options =
JsonReader.Options.of("name", "price")
private val stringAdapter: JsonAdapter =
moshi.adapter(String::class.java, emptySet(), "name")
private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
Moshi’s generated adapter
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private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
Moshi’s generated adapter
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private val options: JsonReader.Options =
JsonReader.Options.of("name", "price")
private val stringAdapter: JsonAdapter =
moshi.adapter(String::class.java, emptySet(), "name")
private val intAdapter: JsonAdapter =
moshi.adapter(Int::class.java, emptySet(), "price")
override fun fromJson(reader: JsonReader): Burger {
var name: String? = null
var price: Int? = null
reader.beginObject()
while (reader.hasNext()) {
when (reader.selectName(options)) {
0 -> name = stringAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("name", "name", reader)
1 -> price = intAdapter.fromJson(reader) ?:
throw Util.unexpectedNull("price", "price", reader)
-1 -> {
Moshi’s generated adapter
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throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
return Burger(
name = name ?:
throw Util.missingProperty("name", "name", reader),
price = price ?:
throw Util.missingProperty("price", "price", reader)
)
}
}
Moshi’s generated adapter
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throw Util.unexpectedNull("price", "price", reader)
-1 -> {
reader.skipName()
reader.skipValue()
}
}
}
reader.endObject()
return Burger(
name = name ?:
throw Util.missingProperty("name", "name", reader),
price = price ?:
throw Util.missingProperty("price", "price", reader)
)
}
}
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Moshi’s generated adapter
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val moshi = Moshi.Builder().build()
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
@zsmb13
: built-in types
Moshi
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val moshi = Moshi.Builder().build()
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
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Moshi: built-in types
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Moshi: built-in types
val moshi = Moshi.Builder().build()
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
Exception in thread "main"
java.lang.IllegalArgumentException:
Platform class java.util.Date
requires explicit JsonAdapter to be
registered
@zsmb13
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Moshi: built-in types
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
val moshi = Moshi.Builder().build()
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
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Moshi: built-in types
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
implementation "com.squareup.moshi:moshi-adapters:$moshi_version"
val moshi = Moshi.Builder().build()
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
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def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-adapters:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
.build()
val moshi = Moshi.Builder()
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Moshi: built-in types
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val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-adapters:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
.add(Date::class.java, Rfc3339DateJsonAdapter())
.build()
val moshi = Moshi.Builder()
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Moshi: built-in types
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val adapter: JsonAdapter =
moshi.adapter(Date::class.java)
def moshi_version = '1.12.0'
implementation "com.squareup.moshi:moshi:$moshi_version"
implementation "com.squareup.moshi:moshi-adapters:$moshi_version"
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
.add(Date::class.java, Rfc3339DateJsonAdapter())
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.build()
val moshi = Moshi.Builder()
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Moshi: built-in types
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@zsmb13
Moshi: field naming
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@JsonClass(generateAdapter = true)
data class Burger(
@Json(name = "name")
val name: String,
@Json(name = "total_cost")
val totalCost: Int,
@Json(name = "sales_price")
val salesPrice: Int
)
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Moshi: field naming
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@JsonClass(generateAdapter = true)
data class Burger(
@Json(name = "name")
val name: String,
@Json(name = "total_cost")
val totalCost: Int,
@Json(name = "sales_price")
val salesPrice: Int
)
moshi.adapter(Burger::class.java)
.toJson(Burger("Classic", 10, 13))
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Moshi: field naming
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@JsonClass(generateAdapter = true)
data class Burger(
@Json(name = "name")
val name: String,
@Json(name = "total_cost")
val totalCost: Int,
@Json(name = "sales_price")
val salesPrice: Int
)
moshi.adapter(Burger::class.java)
.toJson(Burger("Classic", 10, 13))
{"name":"Classic","total_cost":10,"sales_price":13}
@zsmb13
Moshi: field naming
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val total_cost: Int,
val sales_price: Int
)
moshi.adapter(Burger::class.java)
.toJson(Burger("Classic", 10, 13))
{"name":"Classic","total_cost":10,"sales_price":13}
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Moshi: field naming
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val price: Int
)
@zsmb13
Moshi: missing data
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val price: Int
)
Moshi: missing data
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val price: Int
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val price: Int
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Required value 'price' missing at $
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Required value 'description' missing at $
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String?
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String?
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
Burger(name=Cheeseburger, description=null)
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Burger(name=Cheeseburger, description=null)
@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String = "One of our best burgers!"
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
@zsmb13
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Burger(name=Cheeseburger, description=null)
@JsonClass(generateAdapter = true)
data class Burger(
val name: String,
val description: String = "One of our best burgers!"
)
Moshi: missing data
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\"}"
)
Burger(name=Cheeseburger, description=One of our best burgers!)
@zsmb13
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val moshi = Moshi.Builder()
Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
.build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\", \"price\": 13}"
)
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
.add(...)
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\", \"price\": 13}"
)
.build()
val moshi = Moshi.Builder()
@zsmb13
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val moshi = Moshi.Builder()
Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
.build()
val burgerAdapter = moshi.adapter(Burger::class.java)
val burger = burgerAdapter.fromJson(
"{\"name\": \"Cheeseburger\", \"price\": 13}"
)
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
JsonAdapter
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.toJson(Burger("Cancelled", null))
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.toJson(Burger("Cancelled", null))
{"name":"Cancelled"}
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.serializeNulls()
burgerAdapter.toJson(Burger("Cancelled", null))
{"name":"Cancelled","price":null}
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.serializeNulls()
burgerAdapter.toJson(Burger("Cancelled", null))
{"name":"Cancelled","price":null}
@zsmb13
JsonAdapter
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int?)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.serializeNulls()
burgerAdapter.toJson(Burger("Cancelled", null))
{"name":"Cancelled","price":null}
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.toJson(null)
@zsmb13
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.toJson(null)
null
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.nullSafe()
burgerAdapter.toJson(null)
null
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.nonNull()
burgerAdapter.toJson(null)
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.nonNull()
burgerAdapter.toJson(null)
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Unexpected null at $
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13}"
)
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13}"
)
Burger(name=Cheeseburger, price=13)
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13,\"rating\":4.2}"
)
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Moshi: customization options
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13,\"rating\":4.2}"
)
Burger(name=Cheeseburger, price=13)
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.failOnUnknown()
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13,\"rating\":4.2}"
)
Moshi: customization options
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
val moshi = Moshi.Builder().build()
val burgerAdapter = moshi.adapter(Burger::class.java)
.failOnUnknown()
burgerAdapter.fromJson(
"{\"name\":\"Cheeseburger\",\"price\": 13,\"rating\":4.2}"
)
Moshi: customization options
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Cannot skip unexpected NAME at $.rating
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Moshi: malformed data
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
@zsmb13
Moshi: malformed data
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
val restaurant = adapter.fromJson(json, Restaurant::class.java)
@zsmb13
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Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json = """{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
val restaurant = adapter.fromJson(json, Restaurant::class.java)
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
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val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
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"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
@zsmb13
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Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
@zsmb13
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Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
@zsmb13
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Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
@zsmb13
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Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
@zsmb13
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Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: "crocodile"
@zsmb13
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Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "crocodile" }
]
}"""
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was crocodile at
path $.menu[2].price
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: "crocodile"
@zsmb13
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Moshi: malformed data
@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "" }
]
}"""
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was at
path $.menu[2].price
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: ""
@zsmb13
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@JsonClass(generateAdapter = true)
data class Burger(val name: String, val price: Int)
@JsonClass(generateAdapter = true)
data class Restaurant(val menu: List)
val json =
val restaurant = adapter.fromJson(json, Restaurant::class.java)
"""{
"menu": [
{ "name": "Classic", "price": 10 },
{ "name": "Cheeseburger", "price": 13 },
{ "name": "Double", "price": "" }
]
}"""
Moshi: malformed data
Exception in thread "main"
com.squareup.moshi.JsonDataException:
Expected an int but was at
path $.menu[2].price
Exception in thread "main"
com.google.gson.JsonSyntaxException:
java.lang.NumberFormatException:
For input string: ""
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def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
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def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
implementation "com.squareup.retrofit2:converter-moshi:$retrofit_version"
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Retrofit.Builder()
.baseUrl("...")
.addConverterFactory(MoshiConverterFactory.create())
.build()
def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
implementation "com.squareup.retrofit2:converter-moshi:$retrofit_version"
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Retrofit.Builder()
.baseUrl("...")
.addConverterFactory(MoshiConverterFactory.create())
.build()
def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
implementation "com.squareup.retrofit2:converter-moshi:$retrofit_version"
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.add(...)
.build()
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def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
implementation "com.squareup.retrofit2:converter-moshi:$retrofit_version"
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.add(...)
.build()
@zsmb13
Moshi: Retrofit integration
))
Retrofit.Builder()
.baseUrl("...")
.addConverterFactory(MoshiConverterFactory.create(
.build()
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Retrofit.Builder()
.baseUrl("...")
.addConverterFactory(MoshiConverterFactory.create(
.build()
def retrofit_version = '2.9.0'
implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
implementation "com.squareup.retrofit2:converter-moshi:$retrofit_version"
val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.add(...)
.build()
@zsmb13
Moshi: Retrofit integration
))
moshi
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More Moshi…
•Other built-in adapters
•Intermediate objects while parsing
•Annotated types
•Parsing arrays and other generic types
•KSP support
•A lot more under-the-hood details!
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Resources
•A Few Ok Libraries (Jake Wharton, Square) –
Droidcon Montreal 2015
• https://www.youtube.com/watch?v=WvyScM_S88c
•Upgrading to Moshi (Eric Cochran, Pinterest) -
droidcon NYC 2017
• https://www.youtube.com/watch?v=xHFs7cccnXU
•JSON Explained (Jesse Wilson, Square) –
Chicago Roboto 2019
• https://www.youtube.com/watch?v=1PwdqkKDCSo
@zsmb13
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Resources
•Moshi, another JSON Processor (Jesse Wilson)
• https://developer.squareup.com/blog/moshi-another-json-processor/
•Exploring Moshi’s codegen (Zac Sweers)
• https://www.zacsweers.dev/exploring-moshis-kotlin-code-gen/
•Reflection Machines (Jesse Wilson)
• https://publicobject.com/2016/03/24/reflection-machines/
•Advanced JSON parsing techniques using Moshi and
Kotlin (Christophe Beyls)
• https://medium.com/@BladeCoder/advanced-json-parsing-techniques-
using-moshi-and-kotlin-daf56a7b963d
@zsmb13
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zsmb.co/talks
zsmb13
Márton Braun
› Reflection or codegen
› Kotlin-friendly
› Really fast
› Great failure modes
› Neat APIs
Say “hi” to Moshi