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5.18.2. InVM Limitations

InVM achieves its performance benefits by optimizing the internal data structures that are used to facilitate inter-service communication. For example, the queue used to store messages is not persistent (durable) which means that messages may be lost in the event of failures.
Furthermore if a service is shut down before the queue is emptied, those messages will not be delivered. Because JBossESB allows services to be invoked across multiple different transports concurrently you should be able to design your services such that you can achieve high performance and reliability by the suitable choice of transport for specific Message types.
By default, the InVM transport passes messages “by reference”. In some situations, this can cause data integrity issues, not to mention class cast issues where messages are being exchanged across ClassLoader boundaries.
Message passing “by value” (and so avoid issues such as those listed above) can be turned on by setting the “inVMPassByValue” property on the service in question to “true”: 
<service category="ServiceCat" name="Service2" description="Test Service">
    <property name="inVMPassByValue" value="true" />

    <actions mep="RequestResponse">
        <action name="action" class="org.jboss.soa.esb.mock.MockAction" />
    </actions>
</service>
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