Caused by: java.lang.NullPointerException at oracle.jdbc.driver.NamedTypeAccessor.getOracleObject

Issue

• We are using JBoss eap 6.2.4 with oracle 11.2.0.4.
• we are getting the error below while getting the result from resultset. Same thing works fine weblogic server . Same code works in standalone java application too.

java.lang.NullPointerException
       at oracle.jdbc.driver.NamedTypeAccessor.getOracleObject(NamedTypeAccessor.java:320)
       at oracle.jdbc.driver.NamedTypeAccessor.getObject(NamedTypeAccessor.java:182)
       at oracle.jdbc.driver.NamedTypeAccessor.getObject(NamedTypeAccessor.java:123)
       at oracle.jdbc.driver.OracleResultSetImpl.getObject(OracleResultSetImpl.java:1108)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149)
       at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.event(JBossWebContext.java:91)
       at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.invoke(JBossWebContext.java:72)
       at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926)
      at java.lang.Thread.run(Thread.java:745)

• We are using xdb6.jar and ojdbc.jar from 11..2.04 oracle client .
• We have narrow down the issue already , as it was because of xdb6.jar . But on JBoss side we have doubt .
• If we put xdb.jar and xmlparserv2 in some custom module it does not work . and if we put in oracle.jdbc module then it works fine.Can you please help us to understand this behavior .
• Is it like that different modules will be loaded by different instance of class loader ?