Java Version

[mehtalalit]

Hi,

We are struggling with java version on our Linux Server

"which java" returns
/usr/bin/java

"java -version" returns

java version "1.5.0_20"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_20-b02)
Java HotSpot(TM) Server VM (build 1.5.0_20-b02, mixed mode)


Tried to upgrade java using yum. Yum shows that latest version 1.6.0 is already installed

"alternatives --config java" returns
There is 1 program that provides 'java'.

Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java

which is java 1.6.0

We want java to point to version 1.6.0 and not to 1.5.0

Please suggest.

Thanks for your help

[nmset]

export PATH="/usr/lib/jvm/jre-1.6.0-openjdk/bin:$PATH"
export JAVA_HOME="/usr/lib/jvm/jre-1.6.0-openjdk"

in ~/.bashrc

or in /etc/profile (if it exists in Fedora/Red Hat) and reboot.

[Rubberman]

You can have many versions of java installed on your system. If you look in /usr/java, you will see a number of directories for the java versions you have installed such as jdk1.6.0_20, jrel.5.0_10, etc. You will also see two links. One is 'default' and the other is 'latest'. If you look at /usr/bin/java, typically it is a link to /usr/java/default/bin/java. /usr/java/latest is usually a link to the most recent java installation you made, and while /usr/java/default may point to 'latest', it may not. You should be able to change the default java implementation simply by changing the link from 'default' to the version you need.

[mehtalalit]

Thanks Everyone.

Setting Path in /etc/profile helped

regards

[mehtalalit]

export PATH="/usr/lib/jvm/jre-1.6.0-openjdk/bin:$PATH"
export JAVA_HOME="/usr/lib/jvm/jre-1.6.0-openjdk"

in ~/.bashrc

or in /etc/profile (if it exists in Fedora/Red Hat) and reboot.

Hi,

As suggested I made the changes to /etc/profile to set the default Java version
After I did so, the java -version shows me
1.6.0 but when I run Catalina.sh it shows java version as 1.5.0

env also shows that Java points to 1.5.0

I changed the variable JAVA_HOME and JRE_HOME by exporting the right values. It works fine till the time I reboot the machine. After I reboot, the variable again points to 1.5.0 even though /etc/profile points to 1.6.0

Is there any other file that sets the variables at boot time.

Thanks

[nmset]

You may start catalina through a script, something like

#!/bin/bash
export JAVA_HOME="/<path_to>/<java_1.6>"
su nobody -c "/<path_to>/apache-tomcat-6.0.16/bin/startup.sh"

That's what I had to do at least, long ago...