Exception in thread "main" java.lang.NoClassDefFoundError

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  • jmitch89
    New Member
    • Sep 2008
    • 3
    #1

    Exception in thread "main" java.lang.NoClassDefFoundError

    I don't why I get this error:
    Exception in thread "main" java.lang.NoCla ssDefFoundError

    The statement below works just fine:
    java -cp "appframewo rk-1.0.3.jar;swing-worker-1.1.jar";Curren tStrobe.jar com.visionpro.c urrentstrobe.Cu rrentStrobeApp

    However, the statement below produces the error:
    java -cp "appframewo rk-1.0.3.jar;swing-worker-1.1.jar" -jar CurrentStrobe.j ar

    Exception in thread "main" java.lang.NoCla ssDefFoundError : org/jdesktop/application/SingleFrameAppl ication
    at java.lang.Class Loader.defineCl ass1(Native Method)
    at java.lang.Class Loader.defineCl ass(Unknown Source)
    at java.security.S ecureClassLoade r.defineClass(U nknown Source)
    at java.net.URLCla ssLoader.define Class(Unknown Source)
    at java.net.URLCla ssLoader.access $000(Unknown Source)
    at java.net.URLCla ssLoader$1.run( Unknown Source)
    at java.security.A ccessController .doPrivileged(N ative Method)
    at java.net.URLCla ssLoader.findCl ass(Unknown Source)
    at java.lang.Class Loader.loadClas s(Unknown Source)
    at sun.misc.Launch er$AppClassLoad er.loadClass(Un known Source)
    at java.lang.Class Loader.loadClas s(Unknown Source)
    at java.lang.Class Loader.loadClas sInternal(Unkno wn Source)
    Caused by: java.lang.Class NotFoundExcepti on:org.jdesktop .application.Si ngleFrameApplic ation
    at java.net.URLCla ssLoader$1.run( Unknown Source)
    at java.security.A ccessController .doPrivileged(N ative Method)
    at java.net.URLCla ssLoader.findCl ass(Unknown Source)
    at java.lang.Class Loader.loadClas s(Unknown Source)
    at sun.misc.Launch er$AppClassLoad er.loadClass(Un known Source)
    at java.lang.Class Loader.loadClas s(Unknown Source)
    at java.lang.Class Loader.loadClas sInternal(Unkno wn Source)
    ... 12 more
    Could not find the main class: com.visionpro.c urrentstrobe.Cu rrentStrobeApp. Program will exit.

    Any ideas?
    Tags: None
    • sukatoa
      Contributor
      • Nov 2007
      • 539
      #2
      I've also encountered that one before,

      What i did is i've set the classpath inside the Manifest file instead of doing like what you did in the commandline.

      try it

        Comment

        • jmitch89
          New Member
          • Sep 2008
          • 3
          #3
          I was thinking of doing that.

          I just wonder why this happens. I've used this syntax before without any problems. I'm sure it's a classpath issue but I don't know why it happens.

          They say ignorance is bliss but I hate not understanding why.

            Comment

            • JosAH
              Recognized Expert MVP
              • Mar 2007
              • 11453
              #4
              Originally posted by jmitch89
              I don't why I get this error:
              Exception in thread "main" java.lang.NoCla ssDefFoundError

              The statement below works just fine:
              java -cp "appframewo rk-1.0.3.jar;swing-worker-1.1.jar";Curren tStrobe.jar com.visionpro.c urrentstrobe.Cu rrentStrobeApp

              However, the statement below produces the error:
              java -cp "appframewo rk-1.0.3.jar;swing-worker-1.1.jar" -jar CurrentStrobe.j ar

              Exception in thread "main" java.lang.NoCla ssDefFoundError : org/jdesktop/application/SingleFrameAppl ication

              Any ideas?
              In the first version you supply the class where the main() method is to be found:
              in class com.visionpro.c urrentstrobe.Cu rrentStrobeApp

              In the second version your jar tells the JVM to look for the class
              org/jdesktop/application/SingleFrameAppl ication which can not be found by the
              JVM. Fix the manifest in in the CurrentStrobe.j ar.

              kind regards,

              Jos

                Comment

                • jmitch89
                  New Member
                  • Sep 2008
                  • 3
                  #5
                  The manifest inside the CurrentStrobe jar files read as follows:

                  Manifest-Version: 1.0
                  Ant-Version: Apache Ant 1.7.0
                  Created-By: 10.0-b19 (Sun Microsystems Inc.)
                  Main-Class: com.visionpro.c urrentstrobe.Cu rrentStrobeApp

                  I added,

                  Class-Path: appframework-1.0.3.jar swing-worker-1.1.jar

                  and now it works just by issuing the following command:

                  java -jar CurrentStrobe.j ar

                  Thanks for the help...

                    Comment

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