How to Find JRE installed in linux machine..?

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10-10-2007

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How to Find JRE installed in linux machine..?

Hi all,

Im new to linux... Im in need to write a shell script to check wthr JRE in linux machine... Wtz de best way to find thru BASH?? Plz help me out to solve this issue...

Thanks

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By JRE, do you mean a basic java install? That can be checked by running 'which java'. If it is in the path, it will show up. Other ways include running a find on / and looking for the file with your name. That will be slow, though.

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Unlike Windows, there is no standard way to find out if java is installed on your machine unless ofcourse /usr/bin/java points to GNU java or the SUN java.

You can, at best, look into the environment variables LD_LIBRARY_PATH and PATH to see whether you have a JAVA related path in those env variables.

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Unfortunately a solution like "which java" doesn't always work. For instance, I need to find the JRE location not for the binary "java", but for the library libjvm.so, because I want to launch a JVM from C native code.
The library path is something like this: "<JAVA_HOME>/jre/lib/i386/client/libjvm.so, and because of all symbolic links, if I get a path like /usr/bin/java using "which", it doesn't help me much.

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