java.lang.NoClassDefFoundError at Runtime: Need Class not on Classpath

Question

I have tried several approaches as suggested on this website as well as several others to no avail.

-Running Angstrom embedded Linux, OpenJDK6, Shark VM.

File Structure

All .java and .jar files are stored in directory ./src

• jarfiles: j1.jar j2.jar

• Source code: Coder.java, WrapperClass.java

Compiling and Running

• javac -cp j1.jar:j2.jar Coder.java WrapperClass.java

• Successfully compiles, outputs Coder.class, WrapperClass.class, as well as several other files including Coder$1.class through Coder$6.class, as well as Coder$Main_thread.class and Coder$Progress_Bar_Thread.class, any insight onto what all these .class files are for?

• Run attempts all terminate in java.lang.ClassNotFoundException.

  • ~/coder/src: java Package.Coder
  • ~/coder/src: java -cp jar1.jar:jar2.jar Package.Coder
  • ~/coder: java ./src/Package.Coder
  • ~/coder: java -cp jar1.jar:jar2.jar ./src/Package.Coder

Thank you very much for your help. I have run this on NetBeans and can verify that it's functional code, just a matter of getting it to run on Linux.

Stacktrace is:

Exception in thread "main" java.lang.NoClassDefFoundError: Package/Coder Caused by: java.lang.ClassNotFoundException: Package.Coder

at java.net.URLClassLoader$1.run(URLClassLoader.java:217)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:321)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)

at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)

Could not find the main class: Package.Coder. Program will exit

Answer 1

Assuming this structure

/coder
    /src
        /Package
            /Coder.java
            /WrapperClass.java
        /j1.jar
        /j2.jar

You will need to compile from /src as

javac -cp j1.jar:j2.jar Package/Coder.java Package/WrapperClass.java

This will create .class files in /Package. You can then run it, again from /src as

java -cp j1.jar:j2.jar Package.Coder

assuming the Coder class has a main method which is your entry point.