One of the top reasons I use an IDE editor is to get context information about the classes I am working on. Right now I have lost the java method context information, and have no idea where to reset it? I see an error displayed by eclipse on the line number as I am typing instead of the list of methods and signatures.
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The answer is
Delete the .metadata folder in your workspace.
You can reset settings for eclipse by deleting .metadata folder from your current workspace.
This will however remove all projects from your project explorer NOT workspace. So dont worry your projects have not gone anywhere.
You can import projects from your workspace like this : just make sure that you uncheck "Copy project into workspace".
Have a look here :
All the setting are stored in .metadata file in your workspace delete this and you are good to go
Source: Stackoverflow.com