Method must have signature “String method(), String method(),…

Under Eclipse Luna (4.4) M6 my JSF project gave exceptions like the following when I had EL snipplets like

<h:commandButton action="#{userController.delete(u)}" ...

And here the error in eclipse:

Method must have signature "String method(), String method(), String method(String), String method(String, String), String method(String, String, String), String method(String, String, String, String), String method(String, String, String, String, String), String method(String, String, String, String, String, String), String method(String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String)" but has signature "String method(UserFm)"

I could not figure out what should be wrong with my code and it works well and there were no complaints in older eclipse versions. So I decided to switch off the responsible validation  under Window > Preferences > Web > JavaServer Faces Tools > Validation > Type Assignment Problems > Method expression signature incompatibility.

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