[Bug classpath/30892] New: ConcurrentModificationException using java.nio.channels.spi.AbstractSelectableChannel

[cyprien dot noel at gmail dot com]

When using java nio I get this exception. It does not happen on Sun jvm with
exactly the same code so it might be due do synchronization problems in
AbstractSelectableChannel.java. In the code of this class, it seems the
LinkedList can be modified by addSelectionKey and removeSelectionKey without
locking on blockingLock(), I don't know if it is the problem.

java.util.ConcurrentModificationException
        at java.util.LinkedList$LinkedListItr.checkMod(LinkedList.java:800)
        at java.util.LinkedList$LinkedListItr.next(LinkedList.java:852)
        at
java.nio.channels.spi.AbstractSelectableChannel.locate(AbstractSelect
ableChannel.java:203)
        at
java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSele
ctableChannel.java:242)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor.doAddNew(Socke
tIoProcessor.java:166)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor.access$2(Socke
tIoProcessor.java:143)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(Soc
ketIoProcessor.java:554)
        at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:43)
        at java.lang.Thread.run(Thread.java:741)
        at java.lang.VMThread.run(VMThread.java:53)
        at java.lang.VMThread$1.Invoke(VMThread.java:303)
        at cli.System.Threading.ThreadHelper.ThreadStart_Context(Unknown
Source)
        at cli.System.Threading.ExecutionContext.Run(Unknown Source)
        at cli.System.Threading.ThreadHelper.ThreadStart(Unknown Source)

It appears also sometimes as this exception:

java.lang.NullPointerException
        at java.util.LinkedList$LinkedListItr.<init>(LinkedList.java:787)
        at java.util.LinkedList.listIterator(LinkedList.java:640)
        at java.util.AbstractList.listIterator(AbstractList.java:407)
        at
java.nio.channels.spi.AbstractSelectableChannel.locate(AbstractSelectableChannel.java:199)
        at
java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:242)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor.doAddNew(SocketIoProcessor.java:166)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor.access$2(SocketIoProcessor.java:143)
        at
org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(SocketIoProcessor.java:554)
        at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:43)
        at java.lang.Thread.run(Thread.java:741)
        at java.lang.VMThread.run(VMThread.java:53)
        at java.lang.VMThread$1.Invoke(VMThread.java:303)
        at cli.System.Threading.ThreadHelper.ThreadStart_Context(Unknown
Source)
        at cli.System.Threading.ExecutionContext.Run(Unknown Source)
        at cli.System.Threading.ThreadHelper.ThreadStart(Unknown Source)

Thanks


-- 
           Summary: ConcurrentModificationException using
                    java.nio.channels.spi.AbstractSelectableChannel
           Product: classpath
           Version: 0.93
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: classpath
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cyprien dot noel at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30892