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Java versions on Linux

Posted on 2014-10-13
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Last Modified: 2014-10-14
I have a RHEL 6.5 machine, and I typed in the java versions as follows

java -version
java version "1.7.0_65"
OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_64 u65-b17)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

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So I have a 64 bit Java on a 64 bit Linux

My question is, could there be any other java versions out there currently installed

If so, how do I discover which other versions are installed

Thanks
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Question by:Anthony Lucia
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LVL 68

Accepted Solution

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woolmilkporc earned 250 total points
ID: 40378418
Check the subdirectories of /usr/lib/jvm.

Additionally, run: rpm -qa | grep -i java

With /usr/sbin/alternatives --display java

you'll see all the links to the currently active version and what other alternatives are available.
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LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 40378580
As a last resort you can search the file system:

# find / -type f -name java 2>/dev/null | xargs file | grep -v ASCII
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Assisted Solution

by:Sandy
Sandy earned 250 total points
ID: 40379882
/usr/sbin/alternatives --display java

and in case you found multiple instances then you can choose anyone by using below

 /usr/sbin/alternatives --config java


TY/SA
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Author Closing Comment

by:Anthony Lucia
ID: 40379987
The best answers were

rpm -qa | grep -i java

and

/usr/sbin/alternatives --config java
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