How can we know what version of JRE is used by Tomcat ?

[Ravi Kiran Va]

Hi ,

I have set JAVA_HOME to jdk 1.5 under my Environment Variables .
How can i know that , what version of JRE is my TOMCAT is using ??

Please sugegst , thanks .

[Marco Ehrentreich]

Hi Ravi,

if you start Tomcat from the command line (with startup.sh or startup. bat inside the bin/ directory) it should print some information to the console. There you should see which JRE_HOME Tomcat currently uses.

Additionally it should show up in logs/catalina.out (after a Tomcat start) or you can see it in the command line string (at least on UNIX/Linux).

Another alternative would be a management application like Lambda probe which shows you lots of details about your Tomcat instance and web applications.

Marco

[Tim Holloway]

You should be able to dial in via jconsole as well.

If a webapp needs to know the Java version, it can query the System property.

However, up through and including Tomcat6 you won't be strictly speaking running under a JRE. You have to have a JDK.

[Ravi Kiran Va]

Thank you very much , I found a new tool Lambda probe

[leo donahue]

Or you could simply execute the version.bat file from the bin folder using a command prompt.