I am having a problem with Eclipse Luna after an update. Despite showing in the tree for the project that it is using JRE system library 1.7 the error checking is reporting bugs with a switch using a string that it has a source level below 1.7.
The specific error:
Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are permitted
I have tried going into Properties > Build Path and adding and removing the library but this has not fixed the problem.
I moved from the Eclipse packaged with Debain Wheezy which uses the 1.6 JDK and the much older Eclipse 3.8. I am now using CentOS 7 with the 1.7 JDK. The migration has not been as smooth as I hoped. Since there has some big version jumps, I need help getting this new 4.4 version working properly.
Window -> Preferences -> Java Compiler -> set the compiler level to 1.7
Same for Project -> Properties -> Java Compiler -> 1.7
If you can't find that option (by which I mean Compiler 1.7), you must specify the Installed JRE to be JDK 7 too.