I compiled a class file and want to inject it into an existed jar file. I tried but "jar" command is not a good solution, anyone can help on this?
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5_"jar" command is not a good solution_ why ? – jmj Aug 30 '12 at 08:42
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You tried "jar" and it didn't work ? Did you get error msg ? What exactly is the problem with "jar" ? – justSaid Aug 30 '12 at 08:54
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An alternative is to create a `patch.jar` which you place earlier in your class path. – Peter Lawrey Aug 30 '12 at 09:07
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Basically, adding a file to an existing Jar file is (essentially) the same as adding files to an existing zip file. Take a look here for an example http://stackoverflow.com/questions/3048669/how-can-i-add-entries-to-an-existing-zip-file-in-java – MadProgrammer Aug 30 '12 at 09:10
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@MadProgrammer , I'm trying you way. Thanks – JerryCai Aug 30 '12 at 09:34
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@JigarJoshi, jar is a little bit environment dependent, code is more cross-platform – JerryCai Aug 30 '12 at 09:37
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How jar is platform dependent ? – jmj Aug 30 '12 at 09:39
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@JigarJoshi , jar.exe in Windows and jar in Linux – JerryCai Aug 30 '12 at 09:53
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so I think you can decompress the jar, and copy your class file in the directory you compressed. and re compress these files into a new jar file.
user1203650
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I also thought of this solution, but compare to inject a file to a existed jar, this way is risky. (Consider Manifest file, too big jar file, etc) – JerryCai Aug 30 '12 at 09:36
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If you want to automate it in a script jar is your best bet. It's installed with the JDK and gets the job done.
If it's a one time operation you might want to use e.g. 7-Zip or another archiving software that can handle the jar file format (which is basically a ZIP).
Dude
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