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From nrichards <jricha...@arrisi.com>
Subject Re: AMQ 5.5 non-persistent messages not processed, counted as in-flight
Date Wed, 07 Sep 2011 16:04:44 GMT
Generally things are working, except for an intermittent NPE associated with
accessing the PList in the FileCursor, such as the following. This
apparently results in a lost message.

I am currently working under the assumption this is related to the known
issue https://issues.apache.org/jira/browse/AMQ-3434.

Does this seem correct? Is there an estimate of when this fix might be
available?

2011-09-03 09:17:40,166 ERROR [cursors.FilePendingMessageCursor] [] : Caught
an IO Exception getting the DiskList 7_PendingCursor:S_TableQueue_CHF
java.lang.NullPointerExceptionnull
    at
org.apache.activemq.store.kahadb.plist.PListStore$1.execute(PListStore.java:212)null     
                                      
at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)null
    at
org.apache.activemq.store.kahadb.plist.PListStore.getPList(PListStore.java:208)null      
                                      
at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.getDiskList(FilePendingMessageCursor.java:442)null
    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.flushToDisk(FilePendingMessageCursor.java:423)null

    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.onUsageChanged(FilePendingMessageCursor.java:381)null
       
    at org.apache.activemq.usage.Usage$1.run(Usage.java:268)null                         
                                             
at java.util.concurrent.ThreadPoolExecutor$
Worker.runTask(ThreadPoolExecutor.java:886)null
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)null      
                                      
at java.lang.Thread .run(Thread.java:619)null
Exception in thread "Usage Async Task" java.lang.RuntimeException:
java.lang.NullPointerException

    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.getDiskList(FilePendingMessageCursor.java:445)

    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.flushToDisk(FilePendingMessageCursor.java:423)

    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.onUsageChanged(FilePendingMessageCursor.java:381)

    at org.apache.activemq.usage.Usage$1.run(Usage.java:268)

    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

    at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException

    at
org.apache.activemq.store.kahadb.plist.PListStore$1.execute(PListStore.java:212)

    at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)

    at
org.apache.activemq.store.kahadb.plist.PListStore.getPList(PListStore.java:208)

    at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.getDiskList(FilePendingMessageCursor.java:442)
        ... 6 more


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