Spring Boot entzaubert

Spring Boot entzaubert 9 . D e z e m
b e r 2 0 2 0 I N N O Q Te c h n o l o g y D a y #INNOQTechnologyDay @michaelvitz

MICHAEL VITZ Senior Consultant bei INNOQ Deutschland GmbH

Akt 1 “The Pledge”

Akt 2 “The Turn” 4

5 Akt 3 “The Prestige”

Grundlagen Jeder Trick basiert auf Prinzipien

Trick 1 Embedded Web-Server

11 @RestController @SpringBootApplication public class Application { @GetMapping public String
index() { return "Hello everybody!”; } public static void main(String[] args) { SpringApplication.run(Application.class, args); } }

13 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </dependency>

14 Embedded Web-Server Auswahl •Tomcat (Default) •Jetty •Undertow https://docs.spring.io/spring-boot/docs/current/reference/html/spring- boot-features.html#boot-features-embedded-container

Trick 2 Automatische Konfiguration

16 @Controller public class MyController { @GetMapping public String index()
{ return "index"; } }

17 <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"/> <title>INNOQ Technology
Day</title> </head> <body> <h1>Hello everyone!</h1> </body> </html>

20 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>

22 Eigene Auto-Konfiguration •Besteht aus •Klasse mit @Configuration und Bedingungen
•Eintrag in META-INF/spring.factories der auf Klasse verweist •Optional •Weitere Klassen •Tests für die eigene Auto-Konfiguration https://docs.spring.io/spring-boot/docs/current/reference/html/spring- boot-features.html#boot-features-developing-auto-configuration

Trick 3 Abhängigkeitsmanagement

24 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.4.0</version> <relativePath/>
</parent>

25 [INFO] Scanning for projects... [INFO] [INFO] --------------------------< com.innoq:YDKiQ >---------------------------
[INFO] Building YDKiQ 0.1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-dependency-plugin:3.1.2:tree (default-cli) @ YDKiQ --- [INFO] com.innoq:YDKiQ:jar:0.1.0-SNAPSHOT [INFO] +- org.springframework.boot:spring-boot-starter-thymeleaf:jar:2.4.0:compile [INFO] | +- org.springframework.boot:spring-boot-starter:jar:2.4.0:compile [INFO] | | +- org.springframework.boot:spring-boot-starter-logging:jar:2.4.0:compile [INFO] | | | +- ch.qos.logback:logback-classic:jar:1.2.3:compile [INFO] | | | | \- ch.qos.logback:logback-core:jar:1.2.3:compile [INFO] | | | +- org.apache.logging.log4j:log4j-to-slf4j:jar:2.13.3:compile [INFO] | | | | \- org.apache.logging.log4j:log4j-api:jar:2.13.3:compile [INFO] | | | \- org.slf4j:jul-to-slf4j:jar:1.7.30:compile [INFO] | | +- jakarta.annotation:jakarta.annotation-api:jar:1.3.5:compile [INFO] | | \- org.yaml:snakeyaml:jar:1.27:compile [INFO] | +- org.thymeleaf:thymeleaf-spring5:jar:3.0.11.RELEASE:compile [INFO] | \- org.thymeleaf.extras:thymeleaf-extras-java8time:jar:3.0.4.RELEASE:compile [INFO] +- org.springframework.boot:spring-boot-starter-web:jar:2.4.0:compile [INFO] | +- org.springframework.boot:spring-boot-starter-json:jar:2.4.0:compile [INFO] | | +- com.fasterxml.jackson.core:jackson-databind:jar:2.11.3:compile [INFO] | | | \- com.fasterxml.jackson.core:jackson-annotations:jar:2.11.3:compile [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.11.3:compile [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.11.3:compile [INFO] | | \- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.11.3:compile

26 Archive: spring-boot-starter-thymeleaf-2.4.0.jar Length Date Time Name --------- ---------- -----
---- 0 11-12-2020 14:05 META-INF/ 283 11-12-2020 14:05 META-INF/MANIFEST.MF 211 11-12-2020 13:55 META-INF/NOTICE.txt 11359 11-12-2020 13:55 META-INF/LICENSE.txt --------- ------- 11853 4 files

27 Spring Boot Starter •Verwalten “nur” die Abhängigkeiten •Eigentliche Logik
wird durch die Autoconfigure Abhängigkeit bereitgestellt •über 50 offizielle Starter https://docs.spring.io/spring-boot/docs/current/reference/html/using- spring-boot.html#using-boot-starter •zusätzliche von der Community gepflegte https://github.com/spring-projects/spring-boot/blob/master/spring-boot- project/spring-boot-starters/README.adoc

Trick 4 Externe Konfiguration

29 java -jar ./target/YDKiQ.jar --server.port=8090 … Tomcat started on port(s):
8090 (http) with context path '' …

30 Externe Konfigurationsquellen •Command Line Argumente •JNDI •Java System Properties
•Umgebungsvariablen •Property (oder YAML) Dateien an diversen Stellen

31 Externe Konfiguration Benutzung •Verwendung via @Value(“${my.property}”) •oder über eigene
@ConfigurationProperties Klasse •Hunderte von bereits vorhandenen Properties https://docs.spring.io/spring-boot/docs/current/reference/html/appendix- application-properties.html •Mittels spring-boot-configuration-processor Auto-Completion für IDEs https://docs.spring.io/spring-boot/docs/current/reference/html/appendix- configuration-metadata.html#configuration-metadata-annotation- processor

Und nun richtige Magie ;-) (vorgetragen von einem Anfänger) https:/
/youtu.be/VL9zPNj44Z4

Krischerstr. 100 40789 Monheim am Rhein Germany +49 2173 3366-0
Ohlauer Str. 43 10999 Berlin Germany +49 2173 3366-0 Ludwigstr. 180E 63067 Offenbach Germany +49 2173 3366-0 Kreuzstr. 16 80331 München Germany +49 2173 3366-0 Hermannstrasse 13 20095 Hamburg Germany +49 2173 3366-0 Gewerbestr. 11 CH-6330 Cham Switzerland +41 41 743 0116 innoQ Deutschland GmbH innoQ Schweiz GmbH www.innoq.com Danke! Fragen? Michael Vitz [email protected] +49 151 19116015 @michaelvitz

Spring Boot entzaubert

Spring Boot entzaubert

Michael Vitz

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