J2SE Version (please include all output from java -version flag):
   JDK 8 b129


Does this problem occur on J2SE 7ux? Yes / No (pick one)
   No, works fine on 7u51 and 7u55


Operating System Configuration Information (be specific):
   Windows 7

Bug Description:

Get a very weird error in another UI:

    java.lang.NoClassDefFoundError: sunw/util/EventListener

The stack trace simply shows a lot of ClassLoader, Plugin2ClassLoader, SecureClassLoader, etc, frames. Have checked and according to all static analysis none of classes makes a direct, compile-time reference to this class. Checked for usages of the "sunw.util.EventListener" String constant -- and only found 1 in an Ant utility class that's not available to the client.

Priority justification:
Impact: High, regression
Likelhood: Medium, some icons
Workaround: Medium, unknown

ILW = HMM => P2