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Windows->Preferences->Java->Classpath Variables need to be overrideable on a per project basis. I have two versions of my product, 1.0 and 2.0. The variable I use is: JRE_LIB. Each version of the weblogic appserver is dependant on a specific version of a jre. For instance, wlserver6.1sp2 runs with JRE 1.3.1-04 where as wlserver6.1sp3 runs with JRE 1.3.1-06. So in the project for 1.0 I want my JRE_LIB to be 1.3.1-04 and in 2.0 I want it to be 1.3.1-06.
Then switch to using JRE containers instead, which have more abilities (denote multiple libraries at once, and be configurable on a per project basis). See build path preferences, add library and pick 'JRE System Library' (also remove the variable JRE LIB from your build path). Then you can edit this entry to use a different flavor. Ok to close?
Closing, since we are not going to change classpath variables anyway.
Alright, thanks for the info. It is too bad the ui for that feature is semi-broken bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=40720