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If you put the source code in the JAR file, then it would be there. You should be able to extract using any ZIP/JAR utility.
If you didn't put the source code in the JAR file, then you don't have the source. You can always try a decompiler
You can integrate the JAD decompiler to the JDeveloper IDE for cases when you do not have any source. In this way you will be presented with decompiled source whenever you open a Java class with no source. Please, have a look at this link for instructions: