ISE "zip file closed" from JarURLConnection.getInputStream on JDK 7 when !useCaches

Compile and run the class given in http://netbeans.org/bugzilla/attachment.cgi?id=108629 using JDK 6. It prints

class Bug196716

as expected. Now run using JDK 7 b143; it throws

Exception in thread "main" java.lang.IllegalStateException: zip file closed
at java.util.zip.ZipFile.ensureOpen(ZipFile.java:632)
at java.util.zip.ZipFile.getInputStream(ZipFile.java:345)
at java.util.jar.JarFile.getInputStream(JarFile.java:403)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:162)
at sun.misc.URLClassPath$Loader$1.getInputStream(URLClassPath.java:553)
at sun.misc.Resource.cachedInputStream(Resource.java:77)
at sun.misc.Resource.getByteBuffer(Resource.java:160)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:436)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at Bug196716.main(Bug196716.java:36)