0 Replies Latest reply on Nov 27, 2006 7:10 PM by Jens Rutschmann

    JNI Problem: UnsatisfiedLinkError when calling native librar

    Jens Rutschmann Newbie

      Hi,
      I need to call a third-party .so from a message driven bean. The .so that belongs to the java "header" file is just some sort of wrapper for the actual library.

      The bean, the .so's and the java header declaring the native methods are all in the same JAR / EAR. I do only need to call the .so from classes within this EAR.

      I have changed $JBOSS_HOME/bin/run.sh so that LD_LIBRARY_PATH as well as -Djava.library.path point to the directory JBoss extracts the .so's to.
      I also commented out the "System.load" call in the java header.

      The JBoss server is running on a 64 bit SUSE Linux. The JVM, JBoss and the native libraries are 64 bit versions.

      When deploying I can see in the server output (linux console) that the native libraries are beeing loaded:

      00:38:50,358 INFO [EARDeployer] Init J2EE application: file:/usr/lib64/jboss-4.0.4.GA/server/default/deploy/Calculator.ear
      00:38:50,427 INFO [EJBDeployer] Loading native library: /usr/lib64/jboss-4.0.4.GA/server/default/tmp/native/libren6.so
      00:38:50,439 INFO [EJBDeployer] Loading native library: /usr/lib64/jboss-4.0.4.GA/server/default/tmp/native/librendjv6.so
      00:38:50,901 INFO [EjbModule] Deploying Calculator
      00:38:51,034 INFO [EJBDeployer] Deployed: file:/usr/lib64/jboss-4.0.4.GA/server/default/tmp/deploy/tmp62593Calculator.ear-contents/Calculator.jar
      00:38:51,080 INFO [EARDeployer] Started J2EE application: file:/usr/lib64/jboss-4.0.4.GA/server/default/deploy/Calculator.ear


      As you can see, both the JAR and the libraries are loaded by the same deployer (and therefore by the same classloader ?).

      Now, if I send a message to the MDB using the native library, I get the following output in the console / logfile ("WpKurs2" is the name of the called method):
      00:40:57,424 ERROR [CalculatorBean] java.lang.UnsatisfiedLinkError: WpKurs2
       at de.mmkf.rendjv6.WpKurs2(Native Method)
       at eu.valueprice.calculator.tasks.FixedBondTask.calculate(FixedBondTask.java:64)
       at eu.valueprice.calculator.ejb.CalculatorBean.onMessage(CalculatorBean.java:223)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.invocation.Invocation.performCall(Invocation.java:359)
       at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:495)
       at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:158)
       at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:116)
       at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
       at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
       at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
       at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
       at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:109)
       at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
       at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:136)
       at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:402)
       at org.jboss.ejb.Container.invoke(Container.java:954)
       at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:987)
       at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1287)
       at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:266)
       at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:902)
       at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:170)
       at org.jboss.mq.SpySession.run(SpySession.java:323)
       at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:194)
       at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
       at java.lang.Thread.run(Thread.java:595)


      How can I load the libraries so that the calls work ?

      Thanks in advance !