RE: Too many connections open and dependency on actual ethernet interface

> From: David Waitzman
> 
> We are using openjms-0.7.6.1 running on one Redhat Enterprise 
> linux box.
> There are four processes communicating with a local openjms 
> server.  The config file is:
> 
> <Configuration>
>    <!-- Optional. This represents the default configuration  -->
>    <ServerConfiguration host="localhost" embeddedJNDI="true" />
> 
>    <!-- Required when using an RMI connector -->
>    <Connectors>
>      <Connector scheme="rmi">
>        <ConnectionFactories>
>          <QueueConnectionFactory name="JmsQueueConnectionFactory" />
>          <TopicConnectionFactory name="JmsTopicConnectionFactory" />
>        </ConnectionFactories>
>      </Connector>
>    </Connectors>
> 
>    <!-- Required  -->
>    <DatabaseConfiguration>
>      <JdbmDatabaseConfiguration name="openjms.db" />
>    </DatabaseConfiguration>
> 
>    <!-- Required -->
>    <AdminConfiguration script="${openjms.home}\bin\startup.bat" />
> 
>    <!-- Optional. If not specified, no destinations will be 
> created -->
>    <AdministeredDestinations>
>      <AdministeredTopic name="xxTopic"/>
>          <AdministeredQueue name="xx1" />
>          <AdministeredQueue name="xx2" />
>          <AdministeredQueue name="xx3"/>
>    </AdministeredDestinations>
> 
>    <!-- Optional. If not specified, no users will be created -->
>    <Users>
>      <User xxxxx />
>    </Users>
> </Configuration>
> 
> I have two problems:
> 
> 1. I get a hundred or so TCP connections open, many short lived.
> Why?  I would expect perhaps 4 long lived TCP connections 
> would be sufficient (one from each of the processes to the 
> openjms server).  I think that the many connections are 
> causing performance problems.

This is a side-effect of using the RMI connector.

> 
> 2. The TCP connections use the external IP address of the 
> host.  If the ethernet interface is unplugged or ifconfig'ed 
> down, then openjms dies.  How do I force use of the loopback 
> interface, 127.0.0.1?
> 

Try changing:
  <ServerConfiguration host="localhost" embeddedJNDI="true" />
to:
  <ServerConfiguration host="127.0.0.1" embeddedJNDI="true" />

And set the following system property for both clients and server:
  -Djava.rmi.server.hostname=127.0.0.1
(See http://java.sun.com/j2se/1.4.2/docs/guide/rmi/javarmiproperties.html)

Also, don't use the JdbmDatabase if you can avoid it. Its no longer
supported.

-Tim


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