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From "Tim Lucia" <>
Subject RE: JAVA_HOME / JRE_HOME still necessary?
Date Wed, 10 May 2006 11:24:29 GMT
What about multiple JREs or JDKs on your system?  Unlike Microsoft products,
you can actually have multiple versions of Java on your system coexisting
peacefully.  Try installing the public beta of IE 7--and you are now running
beta software in the core of your OS (assuming of course you have a Windows
desktop ;-)

Also, for security reasons, daemon processes and/or services should not
require or rely on PATH variables.


-----Original Message-----
From: Stefan Wachter [] 
Sent: Wednesday, May 10, 2006 7:13 AM
Subject: JAVA_HOME / JRE_HOME still necessary?

Hi all,

wouldn't it be nice if Tomcat does not need the JAVA_HOME or JRE_HOME 
environment variable? After installation of the SUN-JDK these 
environment variables are not set. Java is in the "path" and that's it.

While starting Tomcat the script "setclasspath.bat" checks if one of the 
environment variables JAVA_HOME or JRE_HOME is set. Then one of these 
variables is used to construct the execution commands and to set the 
CLASSPATH environment variable such that is contains tools.jar.

As far as the execution command is concerned using one of the 
HOME-variables is not necessary as long as Java is in the path.

I wonder why the classpath must contain tools.jar. Tomcat 5.5 uses the 
Eclipse Java compiler for compiling JSPs. Therefore I think that 
tools.jar is no more needed.

Patching "setclasspath.bat" such that it no more relies on one of the 
HOME variables I started Tomcat. It seems to work as usual.

Thanks for your attention,

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