J2SE Version (please include all output from java -version flag):
 java version "1.6.0-ea"
 Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b55)
 Java HotSpot(TM) Client VM (build 1.6.0-ea-b55, mixed mode, sharing)

Does this problem occur on J2SE 1.4.x or 5.0.x ? Yes / No (pick one)
 No

Bug Description:
  When the main JAR of a JNLP contains the signed JNLP-INF/APPLICATION.JNLP file
  (as per spec), the webstart application cannot be started:
  "java.lang.IllegalStateException: zip file closed"


Steps to Reproduce (be specific):

  - unzip attached Archive-File
  - aadjust the JNLP-File (codebase) and build.xml (location of javaws)
  - Just execute the default target of the build.xml file.