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POWhy is a Tomcat webapp failing when an almost identical app starts within the same Tomcat instance?
 

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    <p>We're experiencing slightly strange webapp deployment behaviour under Tomcat 5.5.27 on Linux (both on CentOS in production and Ubuntu 10.04 for development).</p> <p>App A and app B are almost identical (exactly the same libraries, a copied Maven project), App B differs only in that its JPA entities are annotated to access a different table within the same schema (the JNDI database references are identical). </p> <p>When the apps are deployed into either environment, app B will <strong><em>not</em></strong> start. However: </p> <ol> <li>Manually starting the stalled app, from the Tomcat admin console, works fine (???).</li> <li>After any attempt to restart Tomcat, the alphabetically later app fails to start. Point #1 still remains valid (???)</li> <li>Logging <em>is</em> configured (log4j), however, we get nothing from [the yet-to-start] app B's logging, nor errors from Tomcat's 'catalina.out' log file (NB. logging <strong><em>is</em></strong> working once the apps are up and running).</li> </ol> <p>I've done a reasonably thorough search for information (Apache/Tomcat bugzilla, Google) but I've found nothing of real use. Other <a href="https://stackoverflow.com/questions/2737983/tomcat-6-whats-the-significance-of-antiresourcelocking-antijarlocking">posts</a> have sighted the use of the antijarlocking and antiresourcelocking attributes on the server's 'context.xml' 'Context' node, but there is also a suggestion that this is unecessary/inaffective under Linux (hasn't appeared to work here, either).</p> <p>Any ideas?</p> <p>Cheers</p> <p>Rich</p> <p>P.S. Upgrading from Tomcat 5.5.x isn't an option, currently (IT support etc.). </p>
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