Hi John, Christian, could you please have a quick look at this problem. Because of it is currently not possible to pass a Java 7 certification for a hsx24/hsx25 based VM.
Thank you and best regards, Volker On Tue, Mar 26, 2013 at 1:15 PM, Volker Simonis <volker.simo...@gmail.com>wrote: > Hi, > > while running JCK test for our PPC port I realized that the test > 'asCollectorIAE01' which checks valid and invalid 'arrayLength' arguments > to MethodHandle.asCollector() fails for the current 7u/jdk and jdk8/jdk > sources. Further investigations revealed that the failure is due to the > change "7191102: nightly failures after JSR 292 lazy method handle update > (round 3)" which changed the way how > sun.invoke.util.ValueConversions.varargsArray() works. Apparently, the new > implementation can now handle 'arrayLength' parameters up to 254 while the > old implementation could only handle up to 253 parameters. > > However the mentioned JCK test explicitly checks that > MethodHandle.asCollector() throws an exception if called with an > 'arrayLength' argument of 254 and fails for current jdk7u and jdk8 builds > because they can handle such an argument. > > The API-documentation of "MethodHandle.asCollector()" is a little vague > because it only states "Throws: IllegalArgumentException - if ... > arrayLength is not a legal array size" but doesn't actually specify which > are "legal array sizes". I therefore think that this is an implementation > detail and the JCK test should not check for values like 254 but only for > the real hard limits imposed by the VM (i.e. 255). I would therefore > propose to exclude the mentioned test from the TCK. Otherwise the API > documentation would have to be changed to explicitly specify the valid > range of 'arrayLength' arguments. > > Attached you can find a small test program which can be used to reproduce > the problem. Running the program with a released Java 7 version (which > doesn't contain the change "7191102" yet) will throw an > IllegalArgumentException if MethodHandle.asCollector() is called with an > 'arrayLength' argument of 254. On the other hand if the program is beeing > run with a recent JDK8 build (i.e. b82) or a curent build of jdk7u, > MethodHandle.asCollector() will accept 254 as 'arrayLength' parameter and > the generated MethodHandle can indeed be invoked with 254 arguments. > > Notice that there already exists a bug which is related to this problem: > "7194534 : MethodHandle.asCollector() throws IAE with "bad parameter count > 256" in spite of correct param count" ( > http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7194534). However it > only objects the fact that for the the old implementation the > IllegalArgumentException wrongly reports 'arrayLength' + 2 instead of > 'arrayLength' as the failing argument. > > Thank you and best regards, > Volker > >
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