Maven Java Application from Command Line

In this below example will show you create maven based java application from commandline and steps to import in eclipse/STS.

Maven provide maven-archetype-quickstart archetype artifact to create maven based java application from command prompt. You can follow these steps to build the application.

Pre-Requisite

Go to directory/ workspace where you want to create maven Java project. Below is command to create it.

mvn archetype:generate -DgroupId=com.{group}.app -DartifactId={App Name} -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Example :

mvn archetype:generate -DgroupId=com.facingissuesonit.app -DartifactId=test-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Because we are creating our first project with maven that’s why it will download lots of jars or dependencies from maven global repository.

C:\Users\facingissuesonit\workspace-sample>mvn archetype:generate -DgroupId=com.facingissuesonit.app -DartifactId=test-app -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:3.0.1:generate (default-cli) > generate-sources @ standalone-pom >>>
[INFO]
[INFO] <<< maven-archetype-plugin:3.0.1:generate (default-cli) < generate-sources @ standalone-pom <<<
[INFO]
[INFO] --- maven-archetype-plugin:3.0.1:generate (default-cli) @ standalone-pom ---
[INFO] Generating project in Batch mode
[WARNING] No archetype found in remote catalog. Defaulting to internal catalog
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-quickstart:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: basedir, Value: C:\Users\facingissuesonit\workspace-sample
[INFO] Parameter: package, Value: com.facingissuesonit.app
[INFO] Parameter: groupId, Value: com.facingissuesonit.app
[INFO] Parameter: artifactId, Value: test-app
[INFO] Parameter: packageName, Value: com.facingissuesonit.app
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: C:\Users\facingissuesonit\workspace-sample\test-app
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 24.133 s
[INFO] Finished at: 2017-06-06T03:55:59-04:00
[INFO] Final Memory: 14M/148M
[INFO] ------------------------------------------------------------------------

Above example command will create project with name test-app in your current directory and will show directory structure as below.

Test-app
-src
--main
---java
----com
-----facingissuesonit
------app
-------App.java
--test
---java
----com
-----facingissuesonit
------app
-------AppTest.java
-pom.xml

Project pom.xml will have entry as below.

<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.facingissuesonit.app</groupId>
  <artifactId>test-app</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>test-app</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>

Build Project : Go to project directory and run below command to build your project. It will go through all these steps to complete build life cycle as you can see from console logs.

1. validate
2. generate-sources
3. process-sources
4. generate-resources
5. process-resources
6. compile
7. test

mvn package

C:\Users\facingissuesonit\workspace-sample\test-app>mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building test-app 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ test-app ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\facingissuesonit\workspace-sample\test-app\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ test-app ---
[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 C:\Users\facingissuesonit\workspace-sample\test-app\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ test-app ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\facingissuesonit\workspace-sample\test-app\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ test-app ---
[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 C:\Users\facingissuesonit\workspace-sample\test-app\target\test-classes
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ test-app ---
[INFO] Surefire report directory: C:\Users\facingissuesonit\workspace-sample\test-app\target\surefire-reports
 
-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.facingissuesonit.app.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.007 sec
 
Results :
 
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
 
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ test-app ---
[INFO] Building jar: C:\Users\facingissuesonit\workspace-sample\test-app\target\test-app-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.372 s
[INFO] Finished at: 2017-06-06T04:07:45-04:00
[INFO] Final Memory: 16M/145M
[INFO] ------------------------------------------------------------------------

Now our build is successful. We can use below command in target folder to run test-app project.

C:\Users\facingissuesonit\workspace-sample\test-app\target>java -cp test-app-1.0-SNAPSHOT.jar com.facingissuesonit.app.App
Hello World!

Import to Eclipse : To import this project in eclipse first we need to convert this project according to eclipse and then import it.

  • Convert to Eclipse Maven Project : Use below command
    mvn eclipse:eclipse
C:\Users\facingissuesonit\workspace-sample\test-app>mvn eclipse:eclipse
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building test-app 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-eclipse-plugin:2.10:eclipse (default-cli) > generate-resources @ test-app >>>
[INFO]
[INFO] <<< maven-eclipse-plugin:2.10:eclipse (default-cli) < generate-resources @ test-app <<< [INFO] [INFO] --- maven-eclipse-plugin:2.10:eclipse (default-cli) @ test-app --- [INFO] Using Eclipse Workspace: C:\Users\facingissuesonit\workspace-sample [WARNING] Workspace defines a VM that does not contain a valid jre/lib/rt.jar: C:\Program Files\Java\jre1.8.0_73 [INFO] Adding default classpath container: org.eclipse.jdt.launching.JRE_CONTAINER [INFO] Not writing settings - defaults suffice [INFO] Wrote Eclipse project for "test-app" to C:\Users\facingissuesonit\workspace-sample\test-app. [INFO] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.717 s [INFO] Finished at: 2017-06-06T04:56:14-04:00 [INFO] Final Memory: 12M/114M [INFO] ------------------------------------------------------------------------

Import in Eclipse : Follow below steps to import test-app project in Eclipse

Eclipse File -> Import -> General-> Existing Project in Workspace -> Select Project test-app

Import Maven Java application in eclipse

Now your Maven based Java application is ready to develop your project.

Happy Learning !!!

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