How can i add update signed jar file

I am developing an applet which requires signing to run in a browser.
I am developing supporting classes. But these class files have to be added
to the jar. Isnt it??
But to test the applet i need to load it in the browser each time i modify the class files. So the jar file need to be updated every time. But an
IOError
is being displayed when i try to update the signed jar file.
How can i update signed jar file?? Or is there any othe way to test the signed applet during development??

How can i update signed jar file?You can't, the signature is there to make sure the content of the jare hasn't been messed
with.
Either recreate the jar and re sign it or set up a policy during testing.

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