Setting JAVA_HOME and JRE_HOME path

Question

I have been allocated a Linux box in which has java available

# java -version
java version "1.7.0_09-icedtea"
OpenJDK Runtime Environment (rhel-2.3.4.1.el6_3-x86_64)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)

# ls -l /usr/bin/java
lrwxrwxrwx. 1 root root 22 Feb  8  2013 /usr/bin/java -> /etc/alternatives/java

I am new to Java and not sure if JRE is installed in ths box but based upon search:

# rpm -q jre
package jre is not installed
# find / -iname java -print 2>/dev/null
/usr/lib/java
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64/jre/bin/java
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/bin/java
/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre/bin/java
/usr/bin/java
/usr/share/java
/var/lib/alternatives/java
/etc/alternatives/java
/etc/java
/etc/pki/java

But

# echo $JAVA_HOME

# echo $JRE_HOME

So is JAVA is installed and JRE also - am I correct but what value I should set for JAVA_HOME and JRE_HOME env variables?

captainsac · Accepted Answer · 2015-04-30 11:00:50Z

9

I am not sure about any other version of Linux, but in Ubuntu you need open home/.bashrc and add in the end of file

export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64

export PATH=$JAVA_HOME/bin:$PATH

after that, save file and relogin.

EDIT

java will know where is jre by JAVA_HOME.

edited Apr 30, 2015 at 11:00

captainsac

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answered Apr 30, 2015 at 10:38

Simpson

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Comments

Bhargav Modi · Accepted Answer · 2015-04-30 11:07:56Z

3

firstly try to get out of root user if possible than after that change below in your ~/.bash_profile

JAVA_HOME=/usr/java/<Java version 7 jdk>; export JAVA_HOME // you can also try JAVA_HOME=/usr/java/jdk 7 version/bin/java
PATH=$JAVA_HOME/bin:$PATH; export PATH

save it and then

now source ~/.bashrc

after that try

echo $JAVA_HOME it will produce the expected result.

edited Apr 30, 2015 at 11:07

answered Apr 30, 2015 at 10:38

Bhargav Modi

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4 Comments

Programmer Over a year ago

Are my settings now correct: $echo $JAVA_HOME /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64/ $echo $JRE_HOME /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64/jre/

Bhargav Modi Over a year ago

no still its not correct change it to $JAVA_HOME /usr/java/jdk1.7.0.9.x86_64 than it should work properly

Programmer Over a year ago

But : $ls -l /usr/java/jdk1.7.0.9.x86_64 ls: cannot access /usr/java/jdk1.7.0.9.x86_64: No such file or directory please confirm?

Bhargav Modi Over a year ago

@Prakash ok than your previous setting seems correct and you are on right path i guess and JRE home path is not required but still you can do it

Mohan Raj · Accepted Answer · 2015-04-30 10:42:38Z

1

JAVA_HOME should be set as parent folder of the java installed path

and JRE_HOME should be /jre

answered Apr 30, 2015 at 10:42

Mohan Raj

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Comments

Aakash · Accepted Answer · 2019-06-07 06:47:00Z

1

set $JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64

set $JRE_HOME=/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre

edited Jun 7, 2019 at 6:47

answered Apr 30, 2015 at 10:33

Aakash

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1 Comment

Pierre Thibault Over a year ago

No trailing slash.

KernelKoder · Accepted Answer · 2015-04-30 10:38:20Z

0

Based on the output you have posted, i can draw the following conclusions:

Based on the fact that java -version works on your machine, you have the JRE installed.
The 'echo' statements do not produce any output as you have not set the environment variables for them.

On a side note, if you are planning on doing Java Development, then you need the JDK installed. The JRE comes as a subset of the JDK once installed

answered Apr 30, 2015 at 10:38

KernelKoder

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