Download and Install Apple’s JVM (1.5.02)
http://www.apple.com/support/downloads/java2se50release1.html

Download Weblogic 9 for “Red Hat Enterprise Linux (3.0, 4.0, x86)”
http://commerce.bea.com/showproduct.jsp?family=WLS&major=9.0&minor=0

Install on a Linux Machine
Find an available Linux machine on your network and install Weblogic on it. Yes, it really helps to have a Red Hat box lying around for this step as you can’t run the binary installer on your OS X machine.

Copy Installation to Local Machine
Using whatever means you have at your disposal copy the Weblogic installation directory from the Linux server to your OS X machine. You can put it anywhere you want on your OS X machine. I put mine at /usr/local/bea.

Remove Installed JVMs
cd $BEA_HOME
rm -fr jdk150_03
rm -fr jrockit90_150_03

Create Symbolic Link for Apple JVM
cd $BEA_HOME
ln -s /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home jdk150_02

Edit Config Files
Edit the following two configuration files and replace all references to the installed JVM to the Apple JVM.
bea/registry.xml
bea/weblogic90/common/bin/commEnv.sh

Carry On With Business as Usual
That’s it. From here on out you can treat this installation as any other UNIX-based Weblogic installation.