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From "Asankha C. Perera (JIRA)" <j...@apache.org>
Subject [jira] Created: (HTTPCORE-31) ConcurrentModificationException thrown by DefaultConnectingIOReactor.processTimeouts() when 2 worker threads are used
Date Thu, 25 Jan 2007 09:23:49 GMT
ConcurrentModificationException thrown by DefaultConnectingIOReactor.processTimeouts() when
2 worker threads are used
---------------------------------------------------------------------------------------------------------------------

                 Key: HTTPCORE-31
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-31
             Project: HttpComponents Core
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.0-alpha4
            Reporter: Asankha C. Perera


I am seeing a ConcurrentModificationException thrown by DefaultConnectingIOReactor.processTimeouts()
when a load test is being performed. The Javadocs for the Selector.keys() states that the
returned Set is not directly modifiable, but a key is removed only after it has been cancelled
and its channel deregistered. I have started the DefaultConnectingIOReactor with two worker
nodes

Exception in thread "HttpCoreNIOSender" java.util.ConcurrentModificationException
       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
       at java.util.HashMap$KeyIterator.next(HashMap.java:877)
       at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
       at org.apache.http.nio.impl.reactor.DefaultConnectingIOReactor.processTimeouts(DefaultConnectingIOReactor.java:151)
       at org.apache.http.nio.impl.reactor.DefaultConnectingIOReactor.execute(DefaultConnectingIOReactor.java:92)
       at org.apache.axis2.transport.nhttp.HttpCoreNIOSender.executeClientEngine(HttpCoreNIOSender.java:103)
       at org.apache.axis2.transport.nhttp.HttpCoreNIOSender.access$000(HttpCoreNIOSender.java:57)
       at org.apache.axis2.transport.nhttp.HttpCoreNIOSender$1.run(HttpCoreNIOSender.java:80)
       at java.lang.Thread.run(Thread.java:595)

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