java.lang.ClassFormatError under IBM JVM

C:\>jruby -v
jruby 1.6.0 (ruby 1.8.7 patchlevel 330) (2011-03-15 f3b6154) (IBM J9 VM 1.6.0) [
Windows Vista-x86-java]

C:\Users\alexbcoles\>jruby -e "class A;def to_world;puts 'hello';end;end;"
ClassLoader.java:265:in `defineClass': java.lang.ClassFormatError: JVMCFRE068 Kl
assenname ist ungültig.; Klasse=ruby$__dash_e__#method__1$RUBY$to_world, Offset=
0
        from JRubyClassLoader.java:76:in `defineClass'
        from InvocationMethodFactory.java:1351:in `endClassWithBytes'
        from InvocationMethodFactory.java:1335:in `endCallWithBytes'
        from InvocationMethodFactory.java:255:in `getCompiledMethod'
        from RuntimeHelpers.java:1700:in `constructNormalMethod'
        from RuntimeHelpers.java:351:in `def'
        from -e:1:in `class_0$RUBY$A'
        from -e:1:in `__file__'
        from -e:-1:in `load'
        from Ruby.java:670:in `runScript'
        from Ruby.java:574:in `runNormally'
        from Ruby.java:423:in `runFromMain'
        from Main.java:278:in `doRunFromMain'
        from Main.java:198:in `internalRun'
        from Main.java:164:in `run'
        from Main.java:148:in `run'
        from Main.java:128:in `main'

diff --git a/src/org/jruby/internal/runtime/methods/InvocationMethodFactory.java b/src/org/jruby/internal/runtime/methods/InvocationMethodFactory.java
index 5bcbf9b..9e81448 100644
--- a/src/org/jruby/internal/runtime/methods/InvocationMethodFactory.java
+++ b/src/org/jruby/internal/runtime/methods/InvocationMethodFactory.java
@@ -213,7 +213,7 @@ public class InvocationMethodFactory extends MethodFactory implements Opcodes {
     }
 
     private static String getCompiledCallbackName(String typePath, String method) {
-        return (typePath + "#" + method).replaceAll("/", "\\$");
+        return (typePath + "$" + method).replaceAll("/", "\\$");
     }
 
     /**
@@ -775,7 +775,7 @@ public class InvocationMethodFactory extends MethodFactory implements Opcodes {
                 if (superClass == null) throw new RuntimeException("invalid multi combination");
                 String superClassString = p(superClass);
                 int dotIndex = desc1.declaringClassName.lastIndexOf('.');
-                ClassWriter cw = createJavaMethodCtor(generatedClassPath, desc1.declaringClassName.substring(dotIndex + 1) + "#" + desc1.name, superClassString);
+                ClassWriter cw = createJavaMethodCtor(generatedClassPath, desc1.declaringClassName.substring(dotIndex + 1) + "$" + desc1.name, superClassString);
 
                 addAnnotatedMethodInvoker(cw, "call", superClassString, descs);
 
@@ -814,7 +814,7 @@ public class InvocationMethodFactory extends MethodFactory implements Opcodes {
     }
 
     private static String getBlockCallbackName(String typePathString, String method) {
-        return (typePathString + "#" + method).replaceAll("/", "\\$");
+        return (typePathString + "$" + method).replaceAll("/", "\\$");
     }
 
     public CompiledBlockCallback getBlockCallback(String method, String file, int line, Object scriptObject) {