Java, Turbocharged!

Over the last twenty years, there has been a paradigm shift in software development: from meticulously planned release cycles to an experimental way of working in which lead times are becoming shorter and shorter.

More and more companies are replacing Java in the Cloud with Go or Node, as they have much faster startup times combined with a much smaller memory footprint, which is especially important in a serverless environment.

After a short introduction, I will demonstrate how we can create a native executable with Quarkus, and how fast we can scale a large cluster of Quarkus containers in the cloud. Last but not least, I will show you how much fun it is to develop a REST + JPA based application with the help of Quarkus.

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10. Build a new Project mvn io.quarkus:quarkus-maven-plugin:0.16.0:create \ -DprojectGroupId=com.redhat.developers \ -DprojectArtifactId=quarkus-demo \ -DclassName="com.redhat.developers.GreetingResource" \ -Dpath="/hello" http://bit.ly/DevTalksBucharest
11. Build the Native Docker Image cd quarkus-demo mvn package -Pnative -Dnative-image.docker-build=true docker build -f src/main/docker/Dockerfile.native -t quarkus-demo/demo . docker run -i --rm -p 8080:8080 quarkus-demo/demo http://bit.ly/DevTalksBucharest
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16. Build the Image on Openshift oc new-build --binary --name=quarkus-demo -l app=quarkus-demo oc patch bc/quarkus-demo -p '{"spec":{"strategy":{"dockerStrategy":{"dockerfilePath":"s rc/main/docker/Dockerfile.native"}}}}' oc start-build quarkus-demo --from-dir=. --follow http://bit.ly/DevTalksBucharest
17. Instantiate the Image oc new-app --image-stream=quarkus-demo:latest http://bit.ly/DevTalksBucharest
18. Expose the Service oc expose service quarkus-demo http://bit.ly/DevTalksBucharest
19. Get the Route URL export URL="http://$(oc get route | grep quarkus-demo | awk '{print $2}')" echo $URL curl $URL/hello && echo http://bit.ly/DevTalksBucharest
20. Scaling Pods watch oc get pods oc scale dc/quarkus-demo --replicas=3 http://bit.ly/DevTalksBucharest
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27. Creating a Project from Scratch mvn io.quarkus:quarkus-maven-plugin:0.16.0:create http://bit.ly/DevTalksBucharest
28. DeveloperResource package com.redhat.developers; @Path("/developers") public class DeveloperResource { @Path("/hello") @GET @Produces(MediaType.TEXT_PLAIN) public String hello() { return "hello"; } } http://bit.ly/DevTalksBucharest
29. Quarkus on HotspotVM mvn package cd target du -sh * java -jar devtalks-1.0-SNAPSHOT-runner.jar ps ax -o pid,rss,command | numfmt --header --from-unit=1024 --to=iec --field 2 | grep -v grep | grep devtalks http://bit.ly/DevTalksBucharest
30. List Extensions mvn quarkus:list-extensions http://bit.ly/DevTalksBucharest
31. Add Extensions mvn quarkus:add-extensions -Dextensions=quarkus-hibernate-orm-panache,quarkus-jdbc-mar iadb,quarkus-resteasy-jsonb,quarkus-smallrye-fault-toleranc e,quarkus-smallrye-rest-client http://bit.ly/DevTalksBucharest
32. pom.xml <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-hibernate-orm-panache</artifactId> </dependency> <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-jdbc-mariadb</artifactId> </dependency> <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-resteasy-jsonb</artifactId> </dependency> http://bit.ly/DevTalksBucharest
33. pom.xml <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-smallrye-fault-tolerance</artifactId> </dependency> <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-smallrye-rest-client</artifactId> </dependency> http://bit.ly/DevTalksBucharest
34. Developer package com.redhat.developers; @Entity public class Developer extends PanacheEntity { private String name; public static Developer of(String name) { return new Developer(name); } public String getName() { return name; } private Developer(String name) { this.name = name; } private Developer() { //Panache only } } http://bit.ly/DevTalksBucharest
35. application.properties quarkus.datasource.url=jdbc:mariadb://localhost:3306/quarkusdb quarkus.datasource.driver=org.mariadb.jdbc.Driver quarkus.datasource.username=developer quarkus.datasource.password=developer quarkus.hibernate-orm.dialect=org.hibernate.dialect.MySQL5Dialect quarkus.hibernate-orm.database.generation=update quarkus.http.port=8080 quarkus.http.test-port=8083 com.redhat.developers.HelloClient/mp-rest/url=http://quarkus-demo-mypro ject.192.168.64.11.nip.io http://bit.ly/DevTalksBucharest
36. Quarkus Developer Mode mvn compile quarkus:dev http://bit.ly/DevTalksBucharest
37. DeveloperResource package com.redhat.developers; @GET @Produces(MediaType.APPLICATION_JSON) public List<Developer> developers() { return Developer.listAll(); } @Path("/new/{name}") @GET @Produces(MediaType.APPLICATION_JSON) @Transactional public Developer newDeveloper(@PathParam("name") String name) { Developer developer = Developer.of(name); developer.persist(); return developer; } http://bit.ly/DevTalksBucharest
38. HelloClient package com.redhat.developers; @RegisterRestClient public interface HelloClient { @Path("/hello") @GET @Produces(MediaType.TEXT_PLAIN) String hello(); } http://bit.ly/DevTalksBucharest
39. DeveloperResource package com.redhat.developers; @Path("/developers") public class DeveloperResource { @Inject @RestClient private HelloClient helloClient; @Path("/hello") @GET @Produces(MediaType.TEXT_PLAIN) @Fallback(fallbackMethod = "onFallback") public String helloWorld() { return helloClient.hello(); } private String onFallback() { return "Hello Bucharest!"; } } http://bit.ly/DevTalksBucharest