Boyzoid's Blog & Stuff

As I mentioned in this post, I described, briefly how my development environment is set up, and how I installed ColdFusion 8 onto the same JRun server where I have ColdFusion 7 installed.  A reader inquired about the JVM and if there are any conflicts.  Well, the answer is no, there are not.  Why?  Well, becasue when you deploy ColdFusion 8 as a .ear file onto a server running ColdFusion 7, JRun will use the JRE specifeid in the java.home variable in {jRun root}/bin/jvm.config, which in my case was 1.4.2_09.

Now, I have been running this configuration since the public beta and have not run into any issues with performance, or even errors occurring when running ColdFusion 8 code.  However, I wanted to set-up my ColdFusion 8 to use the same JRE it would if I had done a different install (stand alone, or multi-server).  This was easy enough as you can create custom jvm.config files and use them to run your JRun 'servers'.

Here's to do it.
Disclaimer: This is for Windows only.  I assume the procedure would be similar in a different environment.

1. Download the latest Java SDK and install it. (You may be able to use the JRE alone, but I didn't test this)
2. Make a copy of jvm.config (located in {JRun root}/bin } and name it jvm_cf8.config. (You can name it whatever you would like, but the rest of the instructions assume you use this name)
3. Change the java.home variable from "C:/JRun4/jre" (It may be different for you) to {new SDK Install path}/jre and save the file.
4. If its running, stop the ColdFusion 8 service.
5. Open a command window and "cd" to {JRun Root}/bin
6. Test the new config by typing jrun -config jvm_cf8.config -start {the name of your ColdFusion 8 server in Jrun}.  If you don't get any errors, you can now set up your Windows service to use this config file.
7. Pressing crtl+c should shut down the JRun server you just started.
8. Type the following to remove the windows service jrunsvc -remove {the name of your ColdFusion 8 server in JRun}
9. Now you need to reinstall the Windows service and tell it to use the new config jrunsvc -install {the name of your ColdFusion 8 server in JRun} -config jvm_cf8.config.
10. You should now be able to start ColdFusion 8 from the Services MMC in Windows.

To verify you are using the updated JVM, log into the ColdFusion Administrator for ColdFusion 8 and go to 'System Information' (It's the blue icon on the top right side of the page) and check the JRE and JVM values.