Jetty

Jetty 7 compatibility with OpenJDK

Details

  • Type: Wish Wish
  • Status: Resolved Resolved
  • Priority: Minor Minor
  • Resolution: Cannot Reproduce
  • Affects Version/s: 7.1.4
  • Fix Version/s: None
  • Component/s: NIO
  • Labels:
    None
  • Environment:
    Ubuntu 10.04 with OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1)
  • Number of attachments :
    0

Description

Upon startup, jetty logs every second:

2010-06-15 23:39:16.582:WARN::EXCEPTION
java.lang.ClassCastException: gnu.java.nio.ServerSocketChannelImpl cannot be cast to java.nio.channels.SocketChannel
at org.eclipse.jetty.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:708)
at org.eclipse.jetty.io.nio.SelectorManager.doSelect(SelectorManager.java:195)
at org.eclipse.jetty.server.nio.SelectChannelConnector.accept(SelectChannelConnector.java:134)
at org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:850)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
at java.lang.Thread.run(libgcj.so.10)

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Greg Wilkins added a comment -

I actually develop jetty with

java version "1.6.0_18"
OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1)
OpenJDK Server VM (build 14.0-b16, mixed mode)

and I do not have this problem.

Judging by the class caste exception, I think you may have run with gcj (which is installed by default on some ubuntus).

Can you try again and make sure that gcj is not on your system. If you can definitely reproduce, please reopen.

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Greg Wilkins added a comment - I actually develop jetty with java version "1.6.0_18" OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1) OpenJDK Server VM (build 14.0-b16, mixed mode) and I do not have this problem. Judging by the class caste exception, I think you may have run with gcj (which is installed by default on some ubuntus). Can you try again and make sure that gcj is not on your system. If you can definitely reproduce, please reopen.
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Joakim Erdfelt added a comment -

Do not use GCJ with Jetty, it will not work.

According to your output, you are using GCJ, not OpenJDK.

There are 2 lines in your output that show you are using the GCJ JRE or JDK, not OpenJDK.

The "gnu.java.nio.ServerSocketChannelImpl" is not present in OpenJDK.
The openjdk-6-jre-headless package on ubuntu contains a /usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar
http://packages.ubuntu.com/lucid/i386/openjdk-6-jre-headless/filelist
which in turn contains the correct, non-gcj version of java.nio.channels.SocketChannel implementation.

The line with java.lang.Thread.run(libgcj.so.10) also points to use of the GCJ based JDK.

Try using the update-alternatives scripts on your ubuntu installation to choose the proper openjdk java impl.
$ sudo update-alternatives --config java

Be aware, that a change in update-alternatives with java will likely require a logout / login of the user you are using to start Jetty.

Good luck

Show
Joakim Erdfelt added a comment - Do not use GCJ with Jetty, it will not work. According to your output, you are using GCJ, not OpenJDK. There are 2 lines in your output that show you are using the GCJ JRE or JDK, not OpenJDK. The "gnu.java.nio.ServerSocketChannelImpl" is not present in OpenJDK. The openjdk-6-jre-headless package on ubuntu contains a /usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar http://packages.ubuntu.com/lucid/i386/openjdk-6-jre-headless/filelist which in turn contains the correct, non-gcj version of java.nio.channels.SocketChannel implementation. The line with java.lang.Thread.run(libgcj.so.10) also points to use of the GCJ based JDK. Try using the update-alternatives scripts on your ubuntu installation to choose the proper openjdk java impl. $ sudo update-alternatives --config java Be aware, that a change in update-alternatives with java will likely require a logout / login of the user you are using to start Jetty. Good luck

People

  • Assignee:
    Greg Wilkins
    Reporter:
    Anthon Pang
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  • Created:
    Updated:
    Resolved: