Package eclipse-dltk appears to be using Java generics, but generates class files in format older than 49.0, which corresponds to J2SE 5.0, in which generics were introduced. Please update this package to generate classes in format 49.0 or above. This corresponds to -target 1.5 option of javac (or ecj). For more information, see bug #842394
Eclipse plugins are setting their target per bundle and each bundle can have different class file version. This is not a problem unless target jsr14 is used which I haven't found in dltk. Closing.