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Hi I am using maven2 to build my project. I am able to generate the jar file using maven build with the command mvn clean install.

I have added this plugin to my pom.xml for manifest file to make the class path entry and main class to execute:

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <mainClass>com.test.TestExample</mainClass> </manifest> </archive> </configuration> </plugin>

When I build the project, and extracted the jar file, its generated manifest.mf file and added the main class entry as : Main-Class: com.test.TestExample and added the jar files to the Class-Path:mail-1.4.jar. But when I am tryign execute the jar file using command java -jar TestJar.jar I am getting the exception :

Caused by: java.lang.ClassNotFoundException: javax.mail.MessagingException at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 1 more

Any pointer to solve this is very helpful..

Thanks in advance..

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  • Are you sure? Works as-is for me. You're unzipping the jar file and checking for the manifest? The plugin is in the builds/plugins element? Commented Nov 22, 2011 at 5:23
  • yes Dave, I have edited my question. Please have a look. Commented Nov 22, 2011 at 5:28
  • I have added the dependency in the pom.xml for mail.jar and its in my local path D:\jars\mail.jar, I am running through the eclipse, and added the entry into build path for mail.jar using the local path, now i am trying to run through the jar file, its unable to find the mail.jar. How can make the mail.jar file availabe to the jar which i am trying to execute? Commented Nov 22, 2011 at 5:42
  • By putting it on the classpath specified in the manifest file. Commented Nov 22, 2011 at 5:44
  • I have a local folder called lib, in which i have all the jars like mail.jar. Can i use that reference to make the mail.jar available? Commented Nov 22, 2011 at 5:47

1 Answer 1

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What you want is to indicate the location of the dependencies to the executable jar. You could try updating your plugin configuration as follows:

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <classpathPrefix>lib/</classpathPrefix> <mainClass>com.test.TestExample</mainClass> </manifest> </archive> </configuration> </plugin>

Then ensure that the lib folder containing your dependencies are present at the same level as your executable jar.

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2 Comments

Hi Raghuram, i have a classpath D:/eclipseWS/TestProj/src/main/resources/lib/xstream-1.2.2.jar"/, and i mentioned <addClasspath>true</addClasspath> <classpathPrefix>lib/</classpathPrefix>, but i am unable to find the jar files from the lib folder.. thanks for your time
You had commented that you had a local folder called lib where you had all these jars. My answer was in response to that. The above snippet will not put any jars anywhere

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