To create the files in this git repo we've already run mvn archetype:generate from http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
mvn archetype:generate -DgroupId=com.myapp.app -DartifactId=myapp -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false
Now, to print "Hello World!", type either...
cd myapp
mvn compile
java -cp target/classes com.myapp.app.App
or...
cd myapp
mvn package
java -cp target/myapp-1.0-SNAPSHOT.jar com.myapp.app.App
Running mvn clean will get us back to only the source Java and the pom.xml:
murphy:myapp pdurbin$ mvn clean --quiet
murphy:myapp pdurbin$ ack -a -f
pom.xml
src/main/java/com/myapp/app/App.java
src/test/java/com/myapp/app/AppTest.java
Running mvn compile produces a class file:
murphy:myapp pdurbin$ mvn compile --quiet
murphy:myapp pdurbin$ ack -a -f
pom.xml
src/main/java/com/myapp/app/App.java
src/test/java/com/myapp/app/AppTest.java
target/classes/com/myapp/app/App.class
murphy:myapp pdurbin$
murphy:myapp pdurbin$ java -cp target/classes com.myapp.app.App
Hello World!
Running mvn package does a compile and creates the target directory, including a jar:
murphy:myapp pdurbin$ mvn clean --quiet
murphy:myapp pdurbin$ mvn package > /dev/null
murphy:myapp pdurbin$ ack -a -f
pom.xml
src/main/java/com/myapp/app/App.java
src/test/java/com/myapp/app/AppTest.java
target/classes/com/myapp/app/App.class
target/maven-archiver/pom.properties
target/myapp-1.0-SNAPSHOT.jar
target/surefire-reports/com.myapp.app.AppTest.txt
target/surefire-reports/TEST-com.myapp.app.AppTest.xml
target/test-classes/com/myapp/app/AppTest.class
murphy:myapp pdurbin$
murphy:myapp pdurbin$ java -cp target/myapp-1.0-SNAPSHOT.jar com.myapp.app.App
Hello World!
Running mvn clean compile exec:java requires http://mojo.codehaus.org/exec-maven-plugin/
Running java -jar target/myapp-1.0-SNAPSHOT.jar requires http://maven.apache.org/plugins/maven-shade-plugin/
JAR Plugin The Maven’s jar plugin will create jar file and we need to define the main class that will get executed when we run the jar file.
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.myapp.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
├── pom.xml
└── src
├── main
│ └── java
│ └── com
│ └── myapp
│ └── app
│ └── App.java
└── test
└── java
└── com
└── myapp
└── app
└── AppTest.java
.
├── pom.xml
├── src
│ ├── main
│ │ └── java
│ │ └── com
│ │ └── myapp
│ │ └── app
│ │ └── App.java
│ └── test
│ └── java
│ └── com
│ └── myapp
│ └── app
│ └── AppTest.java
└── target
├── classes
│ └── com
│ └── myapp
│ └── app
│ └── App.class
├── generated-sources
│ └── annotations
├── generated-test-sources
│ └── test-annotations
├── maven-archiver
│ └── pom.properties
├── maven-status
│ └── maven-compiler-plugin
│ ├── compile
│ │ └── default-compile
│ │ ├── createdFiles.lst
│ │ └── inputFiles.lst
│ └── testCompile
│ └── default-testCompile
│ ├── createdFiles.lst
│ └── inputFiles.lst
├── myapp-1.0-SNAPSHOT.jar
├── surefire-reports
│ ├── com.myapp.app.AppTest.txt
│ └── TEST-com.myapp.app.AppTest.xml
└── test-classes
└── com
└── myapp
└── app
└── AppTest.class
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