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An error message is showing up when closing a project that has source files being opened. To reproduce this bug, do the following. 1. Create or open an existing project. 2. Create or open a couple of existing source files. 3. Quit Eclipse without closing any opened file or the project. 4. Start up Eclipse again, the project that we previously open should show up with all the previously opened files. 5. Close the project. After the last step, the error message shows up. Click Details button will show error messages like this. Unable to create editor: filexxxx.java. Unable to create editor: filexxxx.java. Unable to create editor: filexxxx.java. Note that this problem doesn't happen if open the project after the IDE has already started. This means if you have project A already opened when IDE starts up, then open project B, then close project B, no problem.
Java editors don't seem to react to a Java element delta indicating that the project is being removed from the model. Moving to JDT/Text.
Changing summary since you can open the editor under normal scenario.
*** This bug has been marked as a duplicate of bug 41431 ***