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What we learnt in Project Creation chapter is how to create a Java application using Maven. Now we”ll see how to build and test the application.
Go to C:/MVN directory where you”ve created your java application. Open consumerBanking folder. You will see the POM.xml file with the following contents. Update it to reflect the current java version.
<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>com.companyname.projectgroup</groupId>
<artifactId>project</artifactId>
<version>1.0</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
</dependency>
</dependencies>
</project>
Here you can see, Maven already added Junit as test framework. By default, Maven adds a source file App.java and a test file AppTest.java in its default directory structure, as discussed in the previous chapter.
Let”s open the command console, go the C:MVNconsumerBanking directory and execute the following mvn command.
C:MVNconsumerBanking>mvn clean package
Maven will start building the project.
C:MVNconsumerBanking>mvn clean package [INFO] Scanning for projects... [INFO] [INFO] ----------------< com.companyname.bank:consumerBanking >---------------- [INFO] Building consumerBanking 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ consumerBanking --- [INFO] Deleting C:MVNconsumerBankingtarget [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ consumerBanking --- [WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory C:MVNconsumerBankingsrcmainresources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ consumerBanking --- [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:MVNconsumerBankingtargetclasses [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ consumerBanking --- [WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory C:MVNconsumerBankingsrctestresources [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ consumerBanking --- [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:MVNconsumerBankingtargettest-classes [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ consumerBanking --- [INFO] Surefire report directory: C:MVNconsumerBankingtargetsurefire-reports ------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.companyname.bank.AppTest Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.028 sec Results : Tests run: 1, Failures: 0, Errors: 0, Skipped: 0 [INFO] [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ consumerBanking --- [INFO] Building jar: C:MVNconsumerBankingtargetconsumerBanking-1.0-SNAPSHOT.jar [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 4.663 s [INFO] Finished at: 2021-12-13T17:34:27+05:30 [INFO] ------------------------------------------------------------------------ C:MVNconsumerBanking>
You”ve built your project and created final jar file, following are the key learning concepts −
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We give maven two goals, first to clean the target directory (clean) and then package the project build output as jar (package).
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Packaged jar is available in consumerBankingtarget folder as consumerBanking-1.0-SNAPSHOT.jar.
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Test reports are available in consumerBankingtargetsurefire-reports folder.
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Maven compiles the source code file(s) and then tests the source code file(s).
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Then Maven runs the test cases.
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Finally, Maven creates the package.
Now open the command console, go the C:MVNconsumerBankingtargetclasses directory and execute the following java command.
>java com.companyname.bank.App
You will see the result as follows −
Hello World!
Adding Java Source Files
Let”s see how we can add additional Java files in our project. Open C:MVNconsumerBankingsrcmainjavacomcompanynamebank folder, create Util class in it as Util.java.
package com.companyname.bank;
public class Util {
public static void printMessage(String message){
System.out.println(message);
}
}
Update the App class to use Util class.
package com.companyname.bank;
/**
* Hello world!
*
*/
public class App {
public static void main( String[] args ){
Util.printMessage("Hello World!");
}
}
Now open the command console, go the C:MVNconsumerBanking directory and execute the following mvn command.
>mvn clean compile
After Maven build is successful, go to the C:MVNconsumerBankingtargetclasses directory and execute the following java command.
>java -cp com.companyname.bank.App
You will see the result as follows −
Hello World!
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