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.

Transcript

1. http://bit.ly/JavaForum
2. http://bit.ly/JavaForum
3. http://bit.ly/JavaForum
4. http://bit.ly/JavaForum
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8. Build a new Project mvn io.quarkus:quarkus-maven-plugin:0.18.0:create \ -DprojectGroupId=com.redhat.developers \ -DprojectArtifactId=quarkus-demo \ -DclassName="com.redhat.developers.GreetingResource" \ -Dpath="/hello" http://bit.ly/JavaForum
9. 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/JavaForum
10. http://bit.ly/JavaForum
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13. 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/JavaForum
14. Instantiate the Image oc new-app --image-stream=quarkus-demo:latest http://bit.ly/JavaForum
15. Expose the Service oc expose service quarkus-demo http://bit.ly/JavaForum
16. 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/JavaForum
17. Scaling Pods watch oc get pods oc scale dc/quarkus-demo --replicas=3 http://bit.ly/JavaForum
18. http://bit.ly/JavaForum
20. Creating a Project from Scratch mvn io.quarkus:quarkus-maven-plugin:0.18.0:create http://bit.ly/JavaForum
21. 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/JavaForum
22. 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/JavaForum
23. Quarkus on HotspotVM mvn package cd target du -sh * java -jar stuttgart-1.0-SNAPSHOT-runner.jar ps ax -o pid,rss,command | numfmt --header --from-unit=1024 --to=iec --field 2 | grep -v grep | grep java-forum http://bit.ly/JavaForum
24. List Extensions mvn quarkus:list-extensions http://bit.ly/JavaForum
25. 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/JavaForum
26. 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/JavaForum
27. 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/JavaForum
28. 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/JavaForum
29. Quarkus Developer Mode mvn compile quarkus:dev http://bit.ly/JavaForum
30. 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/JavaForum
31. HelloClient package com.redhat.developers; @RegisterRestClient public interface HelloClient { @Path("/hello") @GET @Produces(MediaType.TEXT_PLAIN) String hello(); } http://bit.ly/JavaForum
32. 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 "Hallo Stuttgart!"; } } http://bit.ly/JavaForum