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Editorial Team
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Asked: 2026-05-19T04:58:14+00:00

I hope no-one has asked this before (I couldn’t find anything, but that may

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I hope no-one has asked this before (I couldn’t find anything, but that may just be poor searching). I am compiling by running ant in my root directory. However, I get this error:

class file has wrong version 50.0, should be 49.0

I know this is because it wants Java 1.6, and is using 1.5, but my mac has Java 1.6 as well (I’ve checked in /System/Library/Frameworks/JavaVM.framework/Versions). How can I get ant to run with 1.6 so that I can compile?

EDIT:
I’ve added the correct path of Java 1.6 to /etc/profile, and
export PATH=$JAVA_HOME/bin:$PATH, after this line. Executing java -version gives the correct version (1.6.0), but running ant -v still produces the same error, and states that Java 1.5 is being used.

Does anyone know how I can force ant to use Java 1.6?!

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1 Answer

  1. Editorial Team

    One easy way is to set JAVA_HOME environment variable to point to the jdk you want to use.

    There’re many ways to do that. E.g., if you’re on mac/linux, you could add this to /etc/profile

    export JAVA_HOME=/path/to/java

    On windows, IIRC, there’s a menu in My Computer/properties.

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