JDK-7184951 : [macosx] Exception at java.awt.datatransfer on headless mode (only in GUI session)
  • Type: Bug
  • Component: client-libs
  • Sub-Component: java.awt
  • Affected Version: 7u6
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: os_x
  • CPU: generic
  • Submitted: 2012-07-18
  • Updated: 2013-08-14
  • Resolved: 2012-08-03
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 7 JDK 8
7u6 b22Fixed 8Fixed
Description
FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.7.0_06-ea-b19)
Java HotSpot(TM) 64-Bit Server VM (build 23.2-b08, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Darwin macmini-4002-2 11.4.0 Darwin Kernel Version 11.4.0: Mon Apr  9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
1. Try the attached short test in GUI session in headless mode;
java -Djava.awt.headless=true GetF4NTests
2. Get the following exception:

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at sun.awt.datatransfer.DataTransferer$1.run(DataTransferer.java:333)
    at sun.awt.datatransfer.DataTransferer$1.run(DataTransferer.java:299)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.awt.datatransfer.DataTransferer.getInstance(DataTransferer.java:345)
    at java.awt.datatransfer.SystemFlavorMap.parseAndStoreReader(SystemFlavorMap.java:392)
    at java.awt.datatransfer.SystemFlavorMap.initSystemFlavorMap(SystemFlavorMap.java:268)
    at java.awt.datatransfer.SystemFlavorMap.getNativeToFlavor(SystemFlavorMap.java:132)
    at java.awt.datatransfer.SystemFlavorMap.getNativesForFlavor(SystemFlavorMap.java:689)
    at java.awt.datatransfer.SystemFlavorMap.getFlavorsForNative(SystemFlavorMap.java:820)
    at GetF4NTests.SystemFlavorMap0016(GetF4NTests.java:20)
    at GetF4NTests.main(GetF4NTests.java:9)
Caused by: java.lang.ClassCastException: sun.awt.HeadlessToolkit cannot be cast to sun.lwawt.macosx.LWCToolkit
    at sun.lwawt.macosx.CToolkitThreadBlockedHandler.<init>(CToolkitThreadBlockedHandler.java:31)
    at sun.lwawt.macosx.CDataTransferer.<init>(CDataTransferer.java:230)
    at sun.lwawt.macosx.CDataTransferer.getInstanceImpl(CDataTransferer.java:94)
    ... 15 more
Exception in thread "main" java.awt.AWTError: Cannot instantiate DataTransferer: sun.lwawt.macosx.CDataTransferer
    at sun.awt.datatransfer.DataTransferer$1.run(DataTransferer.java:336)
    at sun.awt.datatransfer.DataTransferer$1.run(DataTransferer.java:299)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.awt.datatransfer.DataTransferer.getInstance(DataTransferer.java:345)
    at java.awt.datatransfer.SystemFlavorMap.parseAndStoreReader(SystemFlavorMap.java:392)
    at java.awt.datatransfer.SystemFlavorMap.initSystemFlavorMap(SystemFlavorMap.java:268)
    at java.awt.datatransfer.SystemFlavorMap.getNativeToFlavor(SystemFlavorMap.java:132)
    at java.awt.datatransfer.SystemFlavorMap.getNativesForFlavor(SystemFlavorMap.java:689)
    at java.awt.datatransfer.SystemFlavorMap.getFlavorsForNative(SystemFlavorMap.java:820)
    at GetF4NTests.SystemFlavorMap0016(GetF4NTests.java:20)
    at GetF4NTests.main(GetF4NTests.java:9)

Please note that this test is passed when executed in ssh session.

REPRODUCIBILITY :
This bug can be reproduced always.

Affected tests (JCK-runtime-7):
api/java_awt/datatransfer/DataFlavor/index.html#rclass[DataFlavor2010]
api/java_awt/datatransfer/SystemFlavorMap/index.html#GetF4N[SystemFlavorMap0016]
api/java_awt/datatransfer/SystemFlavorMap/index.html#GetF4N[SystemFlavorMap0018]
api/java_awt/datatransfer/SystemFlavorMap/index.html#GetF4N[SystemFlavorMap0019]
api/java_awt/datatransfer/SystemFlavorMap/index.html#SetF4N[SystemFlavorMap0026]
api/java_awt/datatransfer/SystemFlavorMap/index.html#SetN4F[SystemFlavorMap0029]
If this is a TCK-RED it MUST be fixed.  I've asked for JCK (Leonid) to wrk with engineering ASAP - to further evaluate
Comments
EVALUATION We are instantiating the CDataTransferer class when in headless mode and it is not ready for that. As a hot fix i propose to safeguard methods that can be called in headless mode with appropriate checks so we are not calling native methods that may throw an exception or undefined in headless.
23-07-2012