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To whom it may concern,

(Please set the name in your email client to something, or at least sign
your messages with your name.)

On 7/15/2010 9:49 AM, testwreq wreq wrote:
> Hi, Thank you for responding. Below are the commands I used to check java. i
> am confused because which java is reading /usr/bin/java; i think it should
> be /usr/local/jdk1.6.0_20. As you see from the alternatives command, I have
> set the default java to   /usr/local/jdk1.6.0_20/bin/java;
> 
> Please advise.
> What is the difference between java_home and jre_home?

java_home and jre_home are both meaningless

JAVA_HOME is the environment variable that points to your installation
of Java. JRE_HOME is the environment variable that points to your JRE
installation. Often, these values are the same. I believe many utilities
look for either or both of these variables.

http://lmgtfy.com/?q=difference+between+JAVA_HOME+and+JRE_HOME

> [r...@www2 conf]# which java
> /usr/bin/java

No help.

You might want to do less work as "root". It's quite easy to really
break things when you're root.

How about:

$ java -version

> [r...@www2 conf]# alternatives --config java
> There are 3 programs which provide 'java'.
>   Selection    Command
> -----------------------------------------------
>    1           /usr/lib/jvm/jre-1.4.2-gcj/bin/java
> *  2           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
>  + 3           /usr/local/jdk1.6.0_20/bin/java

Great, so you've got 3 Java versions installed:

1. GNU's Compiler for Java v1.4.2
2. OpenJDK v1.6.0 (64-bit version)
3. Sun's Java Development Kit v1.6.0_20

It's tough to tell from the output of "alternatives" which version is
set by default.

> [r...@www2 conf]# echo $JAVA_HOME
> /usr/local/jdk1.6.0_20

That could indicate that Sun's JDK is currently enabled, but maybe not.

How do you launch Tomcat?

Try running this command and reporting the output:

$CATALINA_HOME/bin/version.sh

(Where CATALINA_HOME is the location of Tomcat; probably something like
/usr/local/apache-tomcat-6.0.28)

- -chris
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