How to set JAVA HOME for multiple Tomcat instances

Question

I have 2 Java Web Projects  One runs on JDK 1 5 and the other runs on JDK 1 6  I want to run both of them on the same computer  but the JAVA HOME environment variable can only have one value  I want to set JAVA HOME for each Tomcat server

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Also  note that there shouldn t be any space after     set JAVA HOME C  Program Files Java jdk1 6 0 27

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For Debian distro we can override the setting via defaults   etc default tomcat6   Set the JAVA HOME pointing to the java version you want   JAVA HOME  usr lib jvm java-7-openjdk-amd64

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You can add setenv sh in the the bin directory with      export JAVA HOME   readlink -f  usr bin java   sed  s bin java       and it will dynamically change when you update your packages

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In UNIX I had this problem  I edited catalina sh manually and entered  export JAVA HOME  usr lib jvm java-6-sun-1 6 0 24 echo  Using JAVA HOME         JAVA HOME    as the first 2 lines  I tried setting the JAVA HOME in  etc profile but it did not help   This worked finally

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One thing that you could do would be to modify the catalina sh  Unix based  or the catalina bat  windows based    Within each of the scripts you can set certain variables which only processes created under the shell will inherit  So for catalina sh  use the following line   export JAVA HOME  intented java home    And for windows use  set JAVA HOME  intented java home

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Just a note     If you add that code to setclasspath bat or setclasspath sh  it will actually be used by all of Tomcat s scripts you could run  rather than just Catalina   The method for setting the variable is as the other s have described

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If you are a Windows user  put the content below in a setenv bat file that you must create in Tomcat bin directory   set JAVA HOME C  Program Files Java jdk1 6 x   If you are a Linux user  put the content below in a setenv sh file that you must create in Tomcat bin directory   JAVA HOME  usr java jdk1 6 x

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I had the same problem my OS is windows 8 and I am using Tomcat 8  I just edited the setclasspath bat file in bin folder and set JAVA HOME and JRE HOME like this            echo off               set  JRE HOME  ProgramFiles  Java jre8    set  JAVA HOME  ProgramFiles  Java jdk1 7 0 03                   and it works fine for me now

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place a setenv sh in the the bin directory with  JAVA HOME  usr java jdk1 6 0 43  JRE HOME  usr java jdk1 6 0 43 jre   or an other version your running

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Linux based Tomcat6 should have  etc tomcat6 tomcat6 conf    System-wide configuration file for tomcat6 services   This will be sourced by tomcat6 and any secondary service   Values will be overridden by service-specific configuration   files in  etc sysconfig     Use this one to change default values for all services   Change the service specific ones to affect only one service    see  for instance   etc sysconfig tomcat6       Where your java installation lives  JAVA HOME   usr lib jvm java-1 5 0     Where your tomcat installation lives CATALINA BASE   usr share tomcat6

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I think this is a best practice  You may be have many Tomcat instance in same computer  you want per Tomcat instance use other Java Runtime Environment        This is manual inside file  catalina sh      JRE HOME        Must point at your Java Runtime installation                      Defaults to JAVA HOME if empty  If JRE HOME and JAVA HOME                     are both set  JRE HOME is used

[java] How to set JAVA_HOME for multiple Tomcat instances?

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