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JbossTips
(12 May 2009,
TobyCabot
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_(back to JavaNotes)_ Example database datasource configs are in docs/example/jca. Give jboss more memory than the java default - you'll be glad you did (or sorry if you don't)! Pay attention to the pool sizes in =standardjboss.xml=, especially the Stateless Session Bean pool size, which is 100 by default. This seems pretty low, at least if you have methods that take a while to perform. If you're using MDB's you'll want to bump the =MaximumSize= in the Message Driven Bean =container-invoker-conf= to something larger than the default (which is 15). A strange error in jboss happened when I had the same ejb-jar declared twice in the application.xml. It caused strange errors that looked like classloader problems. For example, one error was an access violation error when one class tried to access a package-protected method of a class in the same package. Another had to do with a class not being able to call a method in another class because it couldn't find the appropriate signature, even though everything appeared to match. ---+ Oracle JBoss and Oracle's jdbc driver don't play nice unless you turn on "TrackConnectionByTx". If you get an error like this when you try to use an Oracle XA datasource: <pre> 18:32:14,956 WARN [TransactionImpl] XAException: tx=TransactionImpl:XidImpl [FormatId=257, GlobalId=DBHMKY11//245, BranchQual=] errorCode=XAER_RMERR oracle.jdbc.xa.OracleXAException at oracle.jdbc.xa.OracleXAResource.checkError(OracleXAResource.java:1157) at oracle.jdbc.xa.client.OracleXAResource.start(OracleXAResource.java:295) at org.jboss.resource.adapter.jdbc.xa.XAManagedConnection.start(XAManagedConnection.java:133) at org.jboss.tm.TransactionImpl.startResource(TransactionImpl.java:1137) at org.jboss.tm.TransactionImpl.enlistResource(TransactionImpl.java:624) ... </pre> Then you need to install the Oracle server JVM option. ---+ CMP EJB Finders I had a problem where I got "EJB Spec Violation" messages indicating that I had violated section 10.5.6 of the spec. Turns out I was trying to declare a custom CMP finder method with a =String= parameter but it needs to be fully-qualified, i.e. =java.lang.String= instead. See http://www.jboss.org/thread.jsp?forum=141&thread=33904&message=3783551 ---+ Multi-homed machines jboss uses a lot of ports by default so it's a pain if more than one instance want to share a machine. Weblogic handles this really gracefully - they multiplex all of their comm over one port so it's easy to change, but jboss isn't there yet. http://www.jboss.org/thread.jsp?forum=61&thread=33958&message=3783690 ---+ Unified JMX You can tell jboss and the JVM to use the same JMX server: http://www.jboss.org/community/wiki/JBossMBeansInJConsole This is great for monitoring.
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