How to change Java version used by TOMCAT

Question

I have Java 1 6 and Tomcat 5 5 installed on my system   But Tomcat 5 5 accesses Java 1 5 and hence as the outcome I get the error Bad version number in  class file while executing java code with JSP   How can I change the Tomcat version to Java 1 6   UPDATE  I tried changing the JVM that the tomcat5w exe is pointing to the version 1 6 and now I am out of the Bad version in  class file error  But now  I get the following error   exception  org apache jasper JasperException org apache jasper servlet JspServletWrapper handleJspException JspServletWrapper java 498  org apache jasper servlet JspServletWrapper service JspServletWrapper java 411  org apache jasper servlet JspServlet serviceJspFile JspServlet java 308  org apache jasper servlet JspServlet service JspServlet java 259  javax servlet http HttpServlet service HttpServlet java 729   root cause  java lang NullPointerException myfirst SearchLink checkURL SearchLink java 20  org apache jsp Test jsp  jspService Test jsp java 52  org apache jasper runtime HttpJspBase service HttpJspBase java 98  javax servlet http HttpServlet service HttpServlet java 729  org apache jasper servlet JspServletWrapper service JspServletWrapper java 369  org apache jasper servlet JspServlet serviceJspFile JspServlet java 308  org apache jasper servlet JspServlet service JspServlet java 259  javax servlet http HttpServlet service HttpServlet java 729    What might be the root cause

User · Answer

On Linux  Tomcat7 has a configuration file located at    etc sysconfig tomcat7       which is where server specific configurations should be made  You can set the JAVA HOME env variable here w o needing to create a profile d  script   This worked for me

User · Answer

In Eclipse it is very easy to point Tomcat to a new JVM  in this example JRE6   My problem was I couldn t find where to do it  Here is the trick    On the ECLIPSE top menu FILE pull down tab  select NEW  -- Other    on the New Server  Select A Wizard window  select  Server-  Server    click NEXT   on the New Server  Define a New Server window  select Apache  Tomcat 7 Server   now click the line in blue and underlined entitled  Configure Runtime Environments on the Server Runtime Environments window    select Apache  expand it click on the arrow to the left   select TOMCAT v7 0  and click EDIT  you will see a window called EDIT SERVER RUNTIME ENVIRONMENT  TOMCAT SERVER On this screen there is a pulldown labeled JREs  You should find your JRE listed like JRE1 6 0 33  If not use the Installed JRE button  Select the desired JRE  Click the FINISH button  Gracefully exit  in the Server  Server Runtime Environments window  click OK in the New Server  Define a new Server window  hit NEXT in the New Server  Add and Remove Window  select apps and install them on the server   in the New Server  Add and Remove Window  click Finish   That s all  Interesting  only steps 7-10 seem to matter  and they will change the JRE used on all servers you have previously defined to use TOMCAT v7 0  The rest of the steps are just because I can t find any other way to get to the screen except by defining a new server  Does anyone else know an easier way

User · Answer

If you use the standard scripts to launch Tomcat  i e  you haven t installed Tomcat as a windows service   you can use the setenv bat file  to set your JRE HOME version      On Windows  create the file  CATALINA BASE  bin setenv bat  with content       set  JRE HOME  ProgramFiles  Java jre1 6 0 20       exit  b 0   And that should be it    You can test this using  CATALINA BASE  bin configtest bat  Disclaimer  I ve only checked this with a Tomcat7 installation    Further Reading    http   tomcat apache org tomcat-5 5-doc RUNNING txt - Section   Advanced Configuration - Multiple Tomcat Instances  http   tomcat apache org tomcat-7 0-doc RUNNING txt - Section    3 4  Using the  setenv  script  optional  recommended

User · Answer

When you open catalina sh   catalina bat  you can see    Environment Variable Prequisites JAVA HOME       Must point at your Java Development Kit installation   So  set your environment variable JAVA HOME to point to Java 6  Also make sure JRE HOME is pointing to the same target  if it is set  Update  since you are on Windows  see here for how to manage your environment variables

User · Answer

test open the termenal or cmd  go to the  tomcat-home  bin directory   ex  c  tomcat8 bin write the following command  Tomcat8W   ES  Tomcat8 will open dialog  select the java tap top tap   change the Java virtual Machine value

User · Answer

You can change the JDK or JRE location using the following steps    open the terminal or cmd  go to the  tomcat-home  bin directory      ex  c  tomcat8 bin write the following command  Tomcat8W   ES  Tomcat8 will open dialog  select the java tab top pane   change the Java virtual Machine value  click OK    note  in Apache TomEE same steps  but step  3  the command must be  TomEE   ES

User · Answer

There are several good answers on here but I wanted to add one since it may be helpful for users like me who have Tomcat installed as a service on a Windows machine   Option 3 here  http   www codejava net servers tomcat 4-ways-to-change-jre-for-tomcat  Basically  open tomcatw exe and point Tomcat to the version of the JVM you need to use then restart the service  Ensure your deployed applications still work as well

[java] How to change Java version used by TOMCAT?

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