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Right click an arbitrary existing project in Package Explore, choose "export..." - "Java" - "Runnable JAR file", I find all the old projects in the "launch configuration" list. Those projects have already been removed from the disk, and are not visible in the Package Explore. How can I remove them from that list? I'm using eclipse indigo.
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Eclipse has the concept to store settings in the 'framework'. The 'framework' is the Eclipse internal data, basically what is inside the . metadata folder of the workspace. If I create a debug configuration for a project, then by default Eclipse stores it in the 'framework' (workspace data).
Just deleting the run configuration and re-creating it by running the class by right click, "Run As Java program" will fix the error.
This question seems to be well answered here, however, to make changes I have simply deleted every undesirable launch configuration from the below path.
${WORKSPACE}/.metadata/.plugins/org.eclipse.debug.core/.launches/Delete all the .class LAUNCH Files After deleting the files, it is necessary to restart Eclipse for the changes to take effect.
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Under Window...Preferences...Run/Debug...Launching...Launch Configurations, you can activate and deactivate some filters that restrict what is shown in Run...Run Configurations. I think it is what you are looking for.
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