How does Talend Open Studio compile the the Java Jobs

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How does Talend Open Studio compile the the Java Jobs

Hello everybody,
I'm getting the error:
java.lang.NoClassDefFoundError: tpm/main_0_1/Main
Caused by: java.lang.ClassNotFoundException: tpm.main_0_1.Main
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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: tpm.main_0_1.Main. Program will exit.
Exception in thread "main"

the code tab contains the correct code. But the <talend_path>\workspace\.Java\classes doesn't contain the java package and the compiled .class files.
I'm sure this is because of some mistake I made but I couldn't fix it yet :-(.
Thanks in advance,
--
Omar

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