JBoss throws a java.io.IOException: Invalid Magic

Issue

• We deployed a custom module, in this case with the IBM DB2 JDBC driver, and at startup JBoss throws an exception:

  12:32:33,209 WARN  [org.jboss.as.server.deployment] (MSC service thread 1-1) JBAS015852: Could not index class COM/ibm/db2os390/sqlj/custom/DB2SQLJEntryInfo.class at /jboss-eap-6.0/bin/content/myapp.war/WEB-INF/lib/db2-jcc-4-2.8.46.jar: java.io.IOException: Invalid Magic
      at org.jboss.jandex.Indexer.verifyMagic(Indexer.java:389) [jandex-1.0.3.Final-redhat-1.jar:1.0.3.Final-redhat-1]
      at org.jboss.jandex.Indexer.index(Indexer.java:630) [jandex-1.0.3.Final-redhat-1.jar:1.0.3.Final-redhat-1]
      at org.jboss.as.server.deployment.annotation.ResourceRootIndexer.indexResourceRoot(ResourceRootIndexer.java:78) [jboss-as-server-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
      at org.jboss.as.server.deployment.annotation.AnnotationIndexProcessor.deploy(AnnotationIndexProcessor.java:51) [jboss-as-server-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
      at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:116) [jboss-as-server-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
      at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA-redhat-1.jar:1.0.2.GA-redhat-1]
      at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA-redhat-1.jar:1.0.2.GA-redhat-1]
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.7.0_09]
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.7.0_09]
      at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_09]