same machine: will JDK1.5 conflict with JDK1.4?

Now I have application running on top of JDK1.4. I have to keep this, can't change. But I want to develop another j2ee application on top of 1.5.

My question is, if I install JDK 1.5 in the same machine, will JDK1.5 conflict with JDK1.4? If one machine has JRE1.5 and JRE1.4, how will tomcat choose JRE version ?

The bottom line is I have to keep my existing application running.

Thanks.

I believe this is simply a matter of which Java version is listed first in your PATH variable.

But I'm moving this topic to the Tomcat forum for expert consideration.

I've had no problem.

On *nix boxes and windows machines, if started from the batch scripts, you control which Java version Tomcat uses with your JAVA_HOME environment variable.

On Windows, if installed with the .exe installer, the path to Java is stored in a registry key.

In either case, having multiple Java versions shouldn't matter.

Thanks.

If my tomcat is unzip version, how could I direct tomcat to JRE1.5 ? I think we could write some DOS batch script, right? Anybody had a try before?

Thanks.

You don't have to write one.

There is already one in tomcat/conf called startup.bat.
You just need to set your JAVA_HOME environment variable and run it.