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From "Ian Kallen (JIRA)" <>
Subject [jira] Created: (AMQ-844) tcp connections hang
Date Tue, 25 Jul 2006 07:36:23 GMT
tcp connections hang

                 Key: AMQ-844
             Project: ActiveMQ
          Issue Type: Bug
          Components: Connector
    Affects Versions: 4.0.2
         Environment: Tried with j2sdk1.4.2_06 and jdk1.5.0_05 on redhat enterprise linux
4 (2.6 kernel).
            Reporter: Ian Kallen
            Priority: Minor

This problem readily occurs running the standard examples:
ant -Durl=tcp:// -Dmax=100 consumer  
ant -Durl=tcp:// -Dmax=10 producer the producer side for 2-5 iterations before is just hangs. Once it's in that state,
all subsequent client connections hang (i.e. control-C out of either consumer or producer
and restart the connection: hangs).

Upping and lowering soTimeout and other connection parameters has so far proven fruitless.
Switching JVMs, up'ing from 4.0.1 to 4.0.2-SNAPSHOT (on both client and server), and including/excluding
"-Ddurable=true" made no difference (all orignal test attempts were with durable messages
but in the end, not incluing that had no effect on whether or not the clients eventually hang).
The config on the server looks like this:

<beans xmlns="">
  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
  <broker useJmx="true">
      <journaledJDBC journalLogFiles="5" dataDirectory="../activemq-data" 
       <transportConnector name="default" uri="tcp://" />
  <bean id="postgres-ds" class="org.postgresql.ds.PGPoolingDataSource">
    <property name="serverName" value="localhost"/>
    <property name="databaseName" value="activemq"/>
    <property name="portNumber" value="0"/>
    <property name="user" value="activemq"/>
    <property name="password" value="activemq"/>
    <property name="dataSourceName" value="postgres"/>
    <property name="initialConnections" value="5"/>
    <property name="maxConnections" value="50"/>

FWIW, this doesn't happen when running the same tests on a laptop (MacOS tiger) with clients
on loopback. Bug is "Minor" but (since is't only exhibited by a small group of us)without
being able validate the client connections, this is a not show-stopper for production use
of activemq.

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