CODEWITHSUNDEEP
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Kynian
Kynian

Reputation: 670

Java.lang.NoClassDefFoundError after using maven for the first time?

I've been creating a soap server with java for my company and I just recently switched over to using Bone-CP and Maven to import all the required 3rd party programs. After I finished implementing bone-CP I used the server command 

jar -cvfm SoapServer.jar manifest.txt SoapServer

And when I transfered it to my server and tried to run it I got this error:

Exception in thread "main" java.lang.NoClassDefFoundError: SoapServer/SoapServer (wrong name: com/test/SoapServer/SoapServer)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

The only think I can think of causing the problem is that maven doesn't package the required JARs with the program? If that's the case do I just need to download them and add them to the class path?

Upvotes: 9

Views: 19281

Answers (1)

Jigar Joshi
Jigar Joshi

Reputation: 240928

If you need all of your dependencies to be packed in the executable jar then configure your pom like

<build>
    <plugins>
      <plugin>
         <artifactId>maven-jar-plugin</artifactId>
         <configuration>
           <archive>
             <manifest>
               <addClasspath>true</addClasspath>
               <classpathPrefix>lib/</classpathPrefix>
               <mainClass>com.something.YourMainClass</mainClass>
             </manifest>
           </archive>
         </configuration>
      </plugin>
    </plugins>
  </build>

above block will add all the library in lib/ to classpath in manifest classpath entry

and to copy all the dependencies to lib directory

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.1</version>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <outputDirectory>${project.build.directory}/lib</outputDirectory>
              <overWriteReleases>false</overWriteReleases>
              <overWriteSnapshots>false</overWriteSnapshots>
              <overWriteIfNewer>true</overWriteIfNewer>
            </configuration>
          </execution>
        </executions>
      </plugin>

Upvotes: 19

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