Compiler generates invalid class names

[scabug]

Code to reproduce:

package test

object ClassNameProblem {
	def main(args:Array[String]) {
		println( classOf[scala.swing.Action.Trigger].getName() )
		println( classOf[scala.swing.Action.Trigger.Wrapper].getEnclosingClass().getName )
		println( classOf[scala.swing.Action.Trigger.Wrapper].getName() )
		System.out.flush()
		println( classOf[scala.swing.Action.Trigger.Wrapper].getSimpleName() )
	}
}

This leads to the following output (and error):

scala.swing.Action$$Trigger
scala.swing.Action$$Trigger$$
scala.swing.Action$$Trigger$$Wrapper
Exception in thread "main" java.lang.InternalError: Malformed class name
	at java.lang.Class.getSimpleName(Class.java:1133)
	at test.ClassNameProblem$$.main(ClassNameProblem.scala:9)
	at test.ClassNameProblem.main(ClassNameProblem.scala)

The problem for scala.swing.Action.Trigger.Wrapper seems to be, that there is no "$$" as separator between the name of the enclosing class and its simple name. But this is expected by java.lang.Class#getSimpleName, which therefore throws the Exception.

In my understanding, class.getSimpleName should never fail. So this seems to be a bug of the Scala compiler.

You might ask, why on Earth one would call this method? Well, JRuby 1.5.1 does for some reason, if you give it e.g. the peer of a scala.swing.ToggleButton. So this problem makes Scala Swing somewhat unusable with JRuby.

Scala version: 2.8.0 [[br]]
Java version: 1.6.0_20 [[br]]
System: Mac OS

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-3845?orig=1
Reporter: Tobias Vogele (tobi)

[scabug]

@paulp said:
This is a duplicate of #2034 and has also been closed wontfix in #1521. I'm not in with "wontfix", but it is not trivial to fix.