Java class library method definition is visible in debugging!!!!!

I create a jar by using java class library project option, and when i am using it in other project, it is displaying all code inside the library, i implement security inside the java library, it contains some key ...... is there any way to hide the code? or how to hide my logic when i submit it to client...
is there any tool for this or is there are any technique to create a dll like microsoft supply.

rohit pathak wrote:
thanks for your time gimbal2 ,
I tested it and it is working fine, i choose the option
Exclude from jar file - **/*.java
and its worked out.could you tell me about security of this class library (.jar file) ? Although i used required code { code which omit .java file during packaging } , is this is secure? or we can get the code { key in my case } from .jar file by any java tool.As you have already noticed through your other thread - yes you can.
how to secure code in java..

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Java class library method definition is visible in debugging!!!!!

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