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Editorial Team
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Asked: 2026-06-10T21:59:25+00:00

I’m compiling DrJava by following these instructions. But when I run ant jar ,

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I’m compiling DrJava by following these instructions.

But when I run ant jar, I get the error:

/Users/arthur/dj/drjava/build.xml:1270: Can't find rt.jar in the Java 7 home: ${env.JAVA7_HOME}

I know that rt.jar is in /Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home/jre/lib.

How do I fix it?

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1 Answer

  1. Editorial Team

    This answer is same as what others have provided – just a little more detailed. So what you simply need is type this on your shell:

    export JAVA7_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home/jre/lib

    Now you have mentioned I know that rt.jar is in /Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home/jre/lib.

    Usually you would not have Contents/Home inside JDK. A standard Java installation should have jdk1.7.0_07.jdk/jre/lib. Check if you have provided the correct path above and rt.jar is indeed in there.

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