Could not find the main class: mocha.Decompiler.

[Aman]

Hello everyone,

I have a problem with mocha:

1. I have installed jdk 6u22 and jre 6u22;
2. I have copyed the myclass.class and mocha.zip to the same folder - c:\myclasses;

But when I typed "java mocha.Decompiler -v -o myclass.class" in the CMD window with "c:\myclasses>" prompt then pressed "Enter", I got the massage as follow:
---------------------------------------------------------------------
Exception in thread "main" java.lang.NoClassDefFoundError: mocha/Decompiler
Caused by: java.lang.ClassNotFoundException: mocha.Decompiler
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)
Could not find the main class: mocha.Decompiler. Program will exit.

------------------------------------------------------------------------

What's the reason.Could somebody help me ?

Thanks a lot.

[pbrockway2]

thread "main" java.lang.NoClassDefFoundError: mocha/Decompiler

This means that the java executable could not find mocha.Decompiler on the classpath.

Things to do/check:

(1) Make sure you have the mocha classes or jar file in c:\myclasses and not the .zip file. You might have to extract the zip file to get at the classes.

(2) Specify the classpath on the command line. If the zip contains a jar file like mocha.jar then the command will look something like

java -cp mocha.jar mocha.Decompiler -v -o myclass.class

If the zip has a mocha folder within it then the command will look like

java -cp . mocha.Decompiler -v -o myclass.class

Read the instructions that came with the library, or are available from whereever you got it. You need usage instructions.

(3) Make sure mocha.Decompiler has a main() method. Or, to put it another way, read the instructions and confirm that this is the class you should be specifying on the command line.

[Aman]

Thank you, pbrockway.

With your advices,I checked my steps carefuly, then found the reason.

I made a low level mistake, I forgot to specify the classpath.

(Don't laugh , I am a brand-new beginner.....hehe....)

So, When I specify the classpath like this

SET CLASSPATH=c:\myclasses;c:\myclasses\mocha.zip

It works.

The result is

C:\myclasses>java mocha.Decompiler
Usage: java mocha.Decompiler [-v] [-o] <Class1.class> <Class2.class>...

Thanks again, rockway!
Best wishes for you!

[pbrockway2]

You're welcome. I'm glad you've got the decompiler running.