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How to modify Execuatable Jar file??????????

 
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Hi All
I am trying updating the Login.jar file.It gives such exception.

C:\TEMP>jar -uvf Login.jar mclasses\prop12.txt
adding: mclasses/prop12.txt(in = 241) (out= 107)(deflated 55%)
java.io.IOException: Error in writing existing jar file
at sun.tools.jar.Main.run(Main.java:179)
at sun.tools.jar.Main.main(Main.java:904)

How can I modify the jar file.
waiting for reply,
Regards from
Parshuram Walunjkar
 
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Hmm, it's hard to tell what the cause might be. It's been a while since I've really used java.io seriously, but I'm wondering if it's a file access problem, e.g.g the files is read only, the file is currently in use and so it's locked.
--Mark
 
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Hi,
I agree with Mark 'coz I tried to update a jar file with the same command. It's working fine!! So, I think the problem with the permission only.
------------
Nayan.
 
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