How should I know which JAVA

Hello
How should I know which JAVA I have installed on: when Issue-ing command "java -version".
I get response like :
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 2.3)
IBM J9 VM (build 2.3, J2RE 1.4.2 IBM J9 2.3 Linux amd64-64 j9vmxa64142-20080923 (JIT enabled)
J9VM - 20080922_23329_LHdSMr
JIT - 20080815_1845_r8
GC - 200809_04)
I know it comes from files like "IBMJava2-AMD64-142-SDK-1.4.2-12.0.x86_64.rpm" or " IBMJava2-AMD64-142-SDK-1.4.2-13.2.x86_64.rpm"
But how to find out. It is an productive system so I can not "try"
Thank you in advance

Hello
In any case java is instaled to /opt/IBMJava2-amd64-142 (this is an unix machine). This is also JAVA_HOME and SAPINST.... variable
This is when I install from "IBMJava2-AMD64-142-SDK-1.4.2-12.0.x86_64.rpm" or from "IBMJava2-AMD64-142-SDK-1.4.2-13.2.x86_64.rpm". When I enter java -version I get (as stated before):
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 2.3)
IBM J9 VM (build 2.3, J2RE 1.4.2 IBM J9 2.3 Linux amd64-64 j9vmxa64142ifx-20090909 (JIT enabled)
J9VM - 20090908_41946_LHdSMr
JIT - 20090210_1447ifx1_r8
GC - 200902_24)
How could I know it comes from "IBMJava2-AMD64-142-SDK-1.4.2-13.2.x86_64.rpm"(version 13 i.e latest) or "IBMJava2-AMD64-142-SDK-1.4.2-12.0.x86_64.rpm"
Kindly please for help

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i searched a lot on the internet and i cannot find how to catch this error...
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any advice????
ps.i have posted a specific msg to the rmi subforum...but i am trying to undestand the general process ..to look the wood not the trees;-)

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I installed the latest JRE in /export/home/jvm/jre1.6.0_17/
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Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
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How do I know which is the correct location of the JVM? What do I add to my PATH environment variable? I'm trying to install Sybase ASE on my Sun Fire v480 SPARC box, but keep getting the below error...
*"A suitable JVM could not be found. Please run the program again using the option -is:javahome <JAVA HOME DIR>"*
So I did the following...
STEP 01) To confirm that Java is installed, I ran the java -version command. I received the following output...
bash-3.00# java -version
java version "1.5.0_17"
Java(TM) Platform, Standard Edition for Business (build 1.5.0_17-b04)
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STEP 03) Then I tried to confirm if it was a symbolic link or not...
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lrwxrwxrwx 1 root other 16 Jun 24 01:54 /usr/bin/java -> ../java/bin/java
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I installed the latest JRE in /export/home/jvm/jre1.6.0_17/
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java version "1.6.0_17"
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bash-3.00# echo $PATH
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LC_MONETARY=en_CA.UTF-8
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TZ=Japan
SHLVL=1
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LC_TIME=en_CA.UTF-8
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