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Using Netbeans 6.8 RC1, I've created a new platform application project and the "Java Platform" combo box in Properties/Libraries doesn't show any platform, even if hitting "Manage java platforms" the platforms defined in nb 6.7 are correctly listed. Opening an existing RCP app project, I notice the same behaviour, and the java.lang.* classes are not recognized in the editor.
Cannot reproduce, could you attach IDE log and build.properties file from userdir here?
Sorry, I don't have these files any more - I have deleted the user directory (and everything worked fine).
I see. Feel free to reopen if it happens again.