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I have multiple versions of java installed on my machine (5,6,7). I downloaded a project which requires jdk6 to compile. Is there a way to 'set' jdk6 to be the default one in that particular directory?

Modifying the makefiles is out of question - way too complex)

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You can change the system wide default jdk, compile and then reveryt back to the one you were using before.

# update-alternatives --config java              # Select java-1.6.0-oracle
# update-java-alternatives --set java-1.6.0-oracle
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