I am running IDEA 4.5.3 build 2250. I installed jdk 1.5.0_01. I made the necessary changes to my path and project. However, it doesn't appear that my project is compiling with jdk1.5 because I am getting compile errors. The path in my debug window shows jdk1.5, my project path module-specific JDK shows 1.5, the jar files listed indicated they are 1.5. I think this might be a registry issue. (I am on Win 2000). On my machine I have uninstalled previous jdk's, rebooted, reinstalled 1.5, and reinstalled IDEA. Has anyone else seen this behavior?