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what is JAVA_HOME for?

 
Greenhorn
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What exactly is the purpose of setting up the JAVA_HOME parameter in the OS environment. How is it different from classpath and path parameters?
 
Ranch Hand
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if im not mistaken the JAVA_HOME is for tomcat web server.
not related to pure java.
 
Ranch Hand
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Originally posted by Roy Ben Ami:
if im not mistaken the JAVA_HOME is for tomcat web server.
not related to pure java.


JAVA_HOME is the directory you install your jdk.
i.e.
JAVA_HOME = c:\jdk1.3.1_01
 
"The Hood"
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If you set a JAVA_HOME parameter, then you can set all your other stuff like classpaths etc in reference to the JAVA_HOME parameter:
set path=%JAVA_HOME%\bin;%path%
set classpath= .;%JAVA_HOME%\lib;
Now you can just switch around your JAVA_HOME parameter and all the related parameters get automatically updated.

The down side of the JAVA_HOME parameter, is that you can forget that you have it set, say in your autoexec.bat, and then you go and tinker around with your classpath, and pick up stuff from the JAVA_HOME directories, causing suprising results - so beware.
 
Greenhorn
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yes you r right JAVA_HOME for Tomcat web server.
It is using to tell web server in which directory our jdk file reside.
No need to mention if u r not using web server.
 
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