java - Find JAVA_HOME and set it on RHEL -


i had installed java while ago on rhel machine. now, i'm trying run program requires java_home variable set. best way figure out installation directory of java installation , set java_home? here results of running java- version : 

java version "1.7.0_25" java(tm) se runtime environment (build 1.7.0_25-b15) java hotspot(tm) 64-bit server vm (build 23.25-b01, mixed mode)

i have /usr/lib/jvm directory, empty.

first, try echo $java_home command line. since java on path already, java_home may set.

what best way figure out installation directory of java installation

running command which java point java installed.

and set java_home

you can edit ~/.bashrc, ~/.bash_profile, or /etc/profile set java_home. setting in ~/etc/profile set system wide, , not want. sake of example output of which java /opt/jdk_1.7.0_25, you'd add export java_home=/opt/jdk_1.7.0_25 ~/.bashrc or ~/.bash_profile , run source ~/.bashrc (or source ~/.bash_profile if set there).

note in case, java on path in cases you'd need add export path=$path:$java_home/bin add java_home variable path.


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