Missing Enum Methods and Program Freezing

[natedogith1]

JAR I will be talking about (http://minecraft.curseforge.com/projects/extra-utilities/files/2310628)

When I open this JAR in jd-gui, com.rwtema.extrautils2.blocks.BlockPassiveGenerator.GeneratorTypes has several enums which are missing bodies (they should be defining the abstract methods, but in the decompiled source they don't)

Also, if I extract the BlockPassiveGenerator$GeneratorTypes$1.class file to my desktop and try to open it in jd-gui, the program seems to freeze.