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I upgraded to java 7 JDK bur minecraft got a black screen after startup.I found out that java 7 didnt work with linux. when i deleted the JDK, minecraft wouldent even open.every java 7 icon is still there, even though it got erased. I have openjdk6 on the computer too.

nic
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  • $ java -version will tell you which version of java is being used. Since the java icon is still there , it might be still present on your system.