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i use ecipse 3.1M3 for windows. i set a src - folder for a project. then i work some time. after a few minutes the classes in this src-folder could not be found. when i delete the sourcefolder and add him again, i can work for some minutes again.
What do you mean by 'the classes in the source folder couldn't be found'? Did you copy class files in the source folder or output directly? Better create a separate classfolder for that, as the compiler can clean output folders on rebuild (turn this off on preferences-java-compiler-build path-'scrup..')
no, i got a seperate java-src (*.java files) folder and a java-class (*.class) folder. after a few minutes, the files could not be resolved. then i delete the src-folder (in project->properties->javabuildpath->remove) and press ok. then i add the folder with the source-files and they can be resolved.
moving to jdt.core Maybe you can attach your .classpath file. Are the types in the two folders overlapping (same qualified type names in both?)
A reproducable test case would be welcome.
Cannot do much without steps to reproduce. Please reopen if you have steps.