IBM SDK, Java Technology Edition on Red Hat Enterprise Linux 6: Supported levels, recommended settings and known problems

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Abstract

Supported levels, recommended settings, known problems, and where possible workarounds, for IBM SDKs, JREs, and Service Refreshes running on Red Hat Enterprise Linux 6.X.

Content

This document contains general information about supported levels, recommended settings, and known problems. when running IBM Java 6, IBM Java 5.0, or IBM Java 1.4.2 on Red Hat Enterprise Linux (RHEL) 6.



IBM SDK, Java Technology Edition, Version 6
Supported level on RHEL 6.1:
    IBM SDK 6 SR9
Known issues:

IBM SDK, Java 2 Technology Edition, Version 5.0
Supported level on RHEL 6:
    IBM SDK 5.0 SR12 FP2
Known issues:

IBM SDK, Java 2 Technology Edition, Version 1.4.2
Supported level on RHEL 6:
    IBM SDK 1.4.2 SR13 FP7
Recommended settings:
    On Intel platforms, set the property:
    JITC_COMPILEOPT=NFASTJITALLOC
Known issues: Note: IBM SDK, Java 2 Technology Edition, Version 1.4.2 is no longer supported unless you have an extended support agreement with IBM.




glibc crash in _Unwind_IteratePhdrCallback() with IBM SDK, Java Technology Edition, V6 on RHEL6
This problem is indicated in two ways.
1) An error message is reported:
    Program terminated with signal 11, Segmentation fault.
2) A failure is reported in the stack trace, similar to the following:
    #10 0x000000467869005a in abort () from /lib64/libc.so.6
    #11 0x0000020000b10a7e in masterSynchSignalHandler () from <...> ibm-java-s390x-60/jre/lib/s390x/default/libj9prt24.so
    #12 <signal handler called>
    #13 0x00000046787b0b44 in _Unwind_IteratePhdrCallback () from /lib64/libc.so.6
    #14 0x00000046787aeb66 in dl_iterate_phdr () from /lib64/libc.so.6
    #15 0x00000046787b2742 in _Unwind_Find_FDE () from /lib64/libc.so.6
    #16 0x0000004678a364fc in ?? () from /lib64/libgcc_s.so.1
    #17 0x0000004678a37184 in ?? () from /lib64/libgcc_s.so.1
    #18 0x0000004678a37258 in _Unwind_ForcedUnwind () from /lib64/libgcc_s.so.1
    #19 0x0000004678827982 in __pthread_unwind () from /lib64/libpthread.so.0

This problem has been reported on zLinux 64 with RHEL6 when running IBM SDK V6 SR8 FP1.

Red Hat are aware of this problem. For more information, see Red Hat Issue Tracker #646954.

Error moving system core file - abrt-hook-ccpp
This is a known problem with IBM SDK V6 on RHEL6. For more information, see APAR IZ88487.

The work around is to disable the abrt service. Do this by running the following command as the root user:
    service abrtd stop

JIT compilation problem on Intel 32-bit platforms with IBM SDK, Java 2 Technology Edition, V1.4.2 on RHEL6
This problem might cause an unexpected exception, or incorrect results. An indicator of the problem is information appearing in the stack trace, similar to the following:
java.lang.InternalError: backstepping from 0.0 to 0.0
at sun.awt.geom.Curve.compareTo(Curve.java(Compiled Code))
at sun.awt.geom.Edge.compareTo(Edge.java(Inlined Compiled Code))
at sun.awt.geom.AreaOp.pruneEdges(AreaOp.java(Compiled Code))

The problem is caused by an optimization used by the JIT compiler for allocating small objects. The optimization depends on assumptions that are not valid on RHEL6. The problem can produce different symptoms, so you should disable the JIT optimization even if you do not encounter the problem.

The work-around is to set the following environment variable:
    export JITC_COMPILEOPT=NFASTJITALLOC
The work around is only required for Intel 32-bit platforms.

Chinese, Japanese, or Korean characters are not displayed properly in GUI applications.
This problem occurs when using MAWT, and has the effect that Chinese, Japanese, or Korean characters are not displayed properly in GUI applications.

On IBM SDK V6 and IBM SDK V5.0, the workaround is to use XAWT instead of MAWT.
On IBM SDK V1.4.2, work around the problem by following the procedure outlined in APAR PM22552.

Red Hat are aware of this problem. For more information, see Red Hat Issue Tracker #604232.

Position for ibus composition window is incorrect.
This problem occurs when using the ibus input method. The effect is that the IME composition window is not displayed under the cursor position. An additional effect is that the composition window does not follow the xterm window if it is moved.

This problem only affects IBM POWER® and s390 platforms.

Red Hat are aware of this problem. For more information, see Red Hat Issue Tracker #651915.

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Document information


More support for:

Runtimes for Java Technology
General

Software version:

1.4.2, 5.0, 6.0

Operating system(s):

Linux

Reference #:

1453725

Modified date:

2010-11-12

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