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Can jsdk.jar and rt.jar be merged together?  RSS feed

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Hi there,
I have a question about the jsdk.jar file. When I compile a servlet, I need to set classpath to this file. I tried this way, but it didn't work. So I tried to merge this file with rt.jar file. What I done is as follows:
1. extract files in rt.jar, using jar xf rt.jar
2. extract files in jsdk.jar
3. add contents in javax folder of jsdk.jar to the javax folder of rt.jar
4. add contents in sun folder of jsdk.jar to the sun folder of rt.jar
5. make a new rt.jar file using jar cf rt.jar javax <folders>
Is this correct way? What I found is the old rt.jar file is 12812 KB, my new rt.jar file is only 6873 KB.
Can anyone told me is this the way feasible? Or how to do it?
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