Dinesh on Java

Here we are creating simple Maven Example Hello World using command prompt by executing the archetype:generate command of mvn tool.First of all going to any directory of computer machine and open command prompt. Here I am using git bash as command prompt. For creating a simple hello java project using maven, we have to open command prompt and run the archetype:generate command of mvn tool.

The command as following we have used to create project-

Command-

mvn archetype:generate -DgroupId=groupid -DartifactId=artifactid   
-DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=booleanValue  

Creating Java Hello World Maven Project

Above is the syntax for creating java project so let see below for actually create command.

mvn archetype:generate -DgroupId=com.dineshonjava -DartifactId=JavaHelloWorld -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

After running this command following is output:

Now it will generate following code in the command prompt:

$ mvn archetype:generate -DgroupId=com.dineshonjava -DartifactId=JavaHelloWorld -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-archetype-plugin:2.4:generate (default-cli) > generate-sources @ standalone-pom >>>
[INFO]
[INFO] <<< maven-archetype-plugin:2.4:generate (default-cli) < generate-sources @ standalone-pom <<<
[INFO]
[INFO] --- maven-archetype-plugin:2.4:generate (default-cli) @ standalone-pom ---
[INFO] Generating project in Batch mode
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-quickstart:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.dineshonjava
[INFO] Parameter: packageName, Value: com.dineshonjava
[INFO] Parameter: package, Value: com.dineshonjava
[INFO] Parameter: artifactId, Value: JavaHelloWorld
[INFO] Parameter: basedir, Value: D:personal datadojmaven-tutorails
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: D:personal datadojmaven-tutorailsJavaHelloWorld
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:03 min
[INFO] Finished at: 2016-10-24T23:58:00+05:30
[INFO] Final Memory: 9M/44M
[INFO] ------------------------------------------------------------------------

Created Project Structure-

Now go to directory where we have created java project. We got following directory structure.

Created files:

Following files are auto generated into java project.

Maven pom.xml file

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.dineshonjava</groupId>
  <artifactId>JavaHelloWorld</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>JavaHelloWorld</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

App.java

package com.dineshonjava;

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
    }
}

AppTest.java

package com.dineshonjava;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * Unit test for simple App.
 */
public class AppTest 
    extends TestCase
{
    /**
     * Create the test case
     *
     * @param testName name of the test case
     */
    public AppTest( String testName )
    {
        super( testName );
    }

    /**
     * @return the suite of tests being tested
     */
    public static Test suite()
    {
        return new TestSuite( AppTest.class );
    }

    /**
     * Rigourous Test :-)
     */
    public void testApp()
    {
        assertTrue( true );
    }
}

Run the created java project

For running created java project we have to compile first then we can run it.

For compile use this command “mvn clean compile”

$ mvn clean compile
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building JavaHelloWorld 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ JavaHelloWorld ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ JavaHelloWorld ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory D:personal datadojmaven-tutorailsJavaHelloWorldsrcmainresources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ JavaHelloWorld ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to D:personal datadojmaven-tutorailsJavaHelloWorldtargetclasses
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.829 s
[INFO] Finished at: 2016-10-25T00:19:50+05:30
[INFO] Final Memory: 9M/22M
[INFO] ------------------------------------------------------------------------

For run this project go to the project directorytargetclasses,

And run following command for executing java class.

java com.dineshonjava.App