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Editorial Team
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Asked: 2026-05-13T21:48:35+00:00

I installed java on my machine and I wanted to compile this group of

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I installed java on my machine and I wanted to compile this group of source code. But when I opened up the command prompt and typed in javac, the command prompt said it was an unknown parameter. The same thing happened when I wanted to build something with ant (I had the build.xml if you are wondering) and the same thing happened. How can I set the javac and ant command to be used in any directory?

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  1. Editorial Team

    First of all you have to be sure you installed JDK and not only JRE

    Secondly it depends on your operating system:

    • windows: you have to reach environment variables by using My Computer (manage->advanced->something here)
    • linux/osx: you have to export variables with export command or by using a .profile file in user directory

    Then you need to set two things:

    • adding /jdk_1.6…/bin/ to your PATH variable
    • setting JAVA_HOME to your root of java installation ( /java_1.6…./ ) (maybe this is not required by java itself but many frameworks use it)

    One note: on OSX, and maybe Linux too you have to split paths in PATH variable with double colon ‘:’ instead that semicolon ‘;’

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