How to create a Java application with Maven

Here I explain how to create and run Java Application using Maven and Eclipse.
Tools used

Eclipse (Helios)
Maven Integration for Eclipse (Help->Eclipse Marketplace  and install it.)
Exec Maven Plugin

Create new Maven project.

Now generated project structure look like this.

Generated pom.xml

pom.xml

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1. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
2.   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
3.   <modelVersion>4.0.0</modelVersion>  
4.   
5.   <groupId>codesstore</groupId>  
6.   <artifactId>codesstore-core</artifactId>  
7.   <version>0.0.1-SNAPSHOT</version>  
8.   <packaging>jar</packaging>  
9.   
10.   <name>codesstore-core</name>  
11.   <url>http://maven.apache.org</url>  
12.   
13.   <properties>  
14.     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
15.   </properties>  
16.   
17.   <dependencies>  
18.     <dependency>  
19.       <groupId>junit</groupId>  
20.       <artifactId>junit</artifactId>  
21.       <version>3.8.1</version>  
22.       <scope>test</scope>  
23.     </dependency>  
24.   </dependencies>  
25. </project>  

<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>codesstore</groupId>
  <artifactId>codesstore-core</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>codesstore-core</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

I created a new class called MyClass.java in com.codesstore.util package.

MyClass.java

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1. package com.codesstore.util;  
2.   
3. public class MyClass {  
4.   
5.  public void printHello() {  
6.   System.out.println("Hello Maven...");  
7.  }  
8. }  

package com.codesstore.util;

public class MyClass {

 public void printHello() {
  System.out.println("Hello Maven...");
 }
}

And called that class in main method.

App.java

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1. package com.codesstore.main;  
2.   
3. import com.codesstore.util.MyClass;  
4.   
5.   
6. public class App {  
7.    
8.  public static void main(String[] args) {  
9.   new MyClass().printHello();  
10.  }  
11. }  

package com.codesstore.main;

import com.codesstore.util.MyClass;


public class App {
 
 public static void main(String[] args) {
  new MyClass().printHello();
 }
}

Now I'm going to add Exec plugin to pom.xml. See more information on Exec plugin http://mojo.codehaus.org/exec-maven-plugin/

pom.xml

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1. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
2.  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
3.  <modelVersion>4.0.0</modelVersion>  
4.   
5.  <groupId>codesstore</groupId>  
6.  <artifactId>codesstore-core</artifactId>  
7.  <version>0.0.1-SNAPSHOT</version>  
8.  <packaging>jar</packaging>  
9.   
10.  <name>codesstore-core</name>  
11.  <url>http://maven.apache.org</url>  
12.   
13.  <properties>  
14.   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
15.  </properties>  
16.   
17.  <dependencies>  
18.   <dependency>  
19.    <groupId>junit</groupId>  
20.    <artifactId>junit</artifactId>  
21.    <version>3.8.1</version>  
22.    <scope>test</scope>  
23.   </dependency>  
24.  </dependencies>  
25.   
26.  <build>  
27.   <plugins>  
28.    <plugin>  
29.     <groupId>org.codehaus.mojo</groupId>  
30.     <artifactId>exec-maven-plugin</artifactId>  
31.     <version>1.1-beta-1</version>  
32.     <executions>  
33.      <execution>  
34.       <goals>  
35.        <goal>java</goal>  
36.       </goals>  
37.      </execution>  
38.     </executions>  
39.     <configuration>  
40.      <mainClass>com.codesstore.main.App</mainClass>  
41.     </configuration>  
42.    </plugin>  
43.   </plugins>  
44.  </build>  
45.   
46. </project>  

<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>codesstore</groupId>
 <artifactId>codesstore-core</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>jar</packaging>

 <name>codesstore-core</name>
 <url>http://maven.apache.org</url>

 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>

 <dependencies>
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>3.8.1</version>
   <scope>test</scope>
  </dependency>
 </dependencies>

 <build>
  <plugins>
   <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>1.1-beta-1</version>
    <executions>
     <execution>
      <goals>
       <goal>java</goal>
      </goals>
     </execution>
    </executions>
    <configuration>
     <mainClass>com.codesstore.main.App</mainClass>
    </configuration>
   </plugin>
  </plugins>
 </build>

</project>

Right click on the pom file -> Run as ->Maven build..

Then you can set goals to run. I use exec:java here.

Out put

Project structure in Eclipse