java.lang.ClassNotFoundException when running java

Question

I'm using ant to build my build.xml file, it compiles ok, but then getting a runtime java.lang.NoClassDefFoundError when running the resulting jar via "java -jar my_jar.jar". It seems like this comes up a lot but none of the related questions' solutions worked for me.

My classpath for javac contains only "/usr/local/lib/libthrift.jar" and the main .java file imports a bunch of thrift packages such as org.apache.thrift.transport.TTransportException.

When I try running the program via:

java -jar MyClass.jar

, I get the error:

Exception in thread "main" **java.lang.NoClassDefFoundError**: org/apache/thrift/transport/TTransportException
Caused by: java.lang.ClassNotFoundException: org.apache.thrift.transport.TTransportException
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: **MyClass**. Program will exit.

Here are the things I've tried so far that don't work:

• adding a flag on the command line like "java -cp /usr/local/lib/libthrift.jar -jar my_jar.jar", the result is the same error as above

• adding <attribute name="Class-Path" value="./:/usr/local/lib/libthrift.jar"/> inside my jar's manifest> tag, the result is the same error as above

• adding -Xbootclasspath/a:/usr/local/lib/libthrift.jar:./ to the java command line. it solves the first error but a different error comes up:

  Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger at org.apache.thrift.transport.TServerSocket.<clinit>(TServerSocket.java:36) at MyClass.start(Unknown Source) at MyClass.main(Unknown Source)

EDIT:

If I comment out the code that instantiates the missing classes but leave the imports, the code executes fine.

EDIT:

I moved my java classes to a server and referenced the MainClass with the server in the manifest attribute, but that didn't fix anything.

Answer 1

You might try adding the jars to the domain of the server. I had a similar problem and this worked for me when I was running it on glassfish. I would get those not found exceptions. Eclipse recognized it and it compiled fine but when ran on the server it couldn't find the file. Try adding it to whatever lib directory the server is installed to.