jklingsporn

Integer i = 127;
Integer j = 127;
boolean same = (i == j); //true
boolean equal = i.equals(j); //true

jklingsporn

Integer i = 23;
int j = i;

jklingsporn

public class LockTest {

    private static final Logger logger = LoggerFactory.getLogger(LockTest.class);

    public static void main(String[] args) throws InterruptedException {
        ForkJoinPool.commonPool().execute(() -> { mayLock(127);});
        ForkJoinPool.commonPool().execute(() -> { mayLock(127);});
        ForkJoinPool.commonPool().shutdown();
        ForkJoinPool.commonPool().awaitTermination(1, TimeUnit.MINUTES);
    }

jklingsporn

<?xml version="1.0" encoding="utf-8"?>
<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
    <id>release</id>
    <formats>
        <format>zip</format>
    </formats>
    <fileSets>
        <fileSet>

jklingsporn

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>io.github.jklingsporn.eb</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>

jklingsporn

#!/bin/bash
set -e
now=$(date +"%Y-%m-%d_%H-%M-%S")
tag="./target/app-$now.zip"
mvn clean install
echo "web: ./run.sh" > target/Procfile
echo "exec java \$JAVA_OPTS -jar app.jar \$JAVA_ARGS" > target/run.sh
chmod +x target/run.sh
zip -j ${tag} target/Procfile target/run.sh target/app.jar

jklingsporn

public class Main {

    public static void main(String[] args) {
        System.out.println(String.format("Look at these wonderful arguments %s", Arrays.toString(args)));
    }

}

jklingsporn

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>io.github.jklingsporn.eb</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>

jklingsporn

//fetch something from A to make a lookup on B
ADao adao = new ADao();
CompletableFuture<A> aFutureLoaded = adao.findByIdAsync(123);
BDao bdao = new BDao();
aFutureLoaded.thenCompose(
  a->bdao.findBySomeAValueAsync(a.getSomeAValue());
).whenComplete((bResult,ex)->{
  if(ex==null){
    //do something with the result
  }else{

jklingsporn

//fetch something from A to make a lookup on B
ADao adao = new ADao();
adao.findByIdAsync(123,h1->{
  if(h1.succeeded()){
    BDao bdao = new BDao();
    bdao.findBySomeAValueAsync(h1.result().getSomeAValue(),h2->{
      if(h2.succeeded()){
        //do something with the result
      }else{
        //oops something went wrong