Initially a duo of decompilers were supported (JD-Core v0 & v1), but now other decompilers are supported with the transformer-api project. JD-Core v0 and v1 are 2 different decompilers rather than 2 ...

Supports decompiling Java class file to source code file. Built on the Fernflower decompiler engine supported for debugging. Write decompiled file named *-source.jar at the class or jar file location.