BC4J/JSP Dynamic JDBC Username Audit Trail

Question

I have implemented a BC4J/JSP login page as per the How To "How To Support Dynamic JDBC Credentials". It all works very nicely thank you.
How can I retrieve the application module's username (passed through from the login page) from within the doDML() method of an EntityImpl?
I need to do this in order to maintain an audit trail of db updates.
Thanks,
James

Answer 1

I think I should be able to use something like:
oracle.jbo.ApplicationModule am = oracle.jbo.client.Configuration.createRootApplicationModule
("package.AppModule", "AppModuleLocal");
oracle.jbo.ConnectionMetadata cm = am.getTransaction().getConnectionMetadata();
String uname = cm.getUserName();
But when I use this I get the error below. Any ideas?
Error Message: JBO-30003: The application pool (rabc4j.Rabc4jModule) failed to checkout an application module due to the following exception:
Error Message: null
JBO-30003: The application pool (rabc4j.Rabc4jModule) failed to checkout an application module due to the following exception:
java.lang.NullPointerException
     java.lang.Object java.util.Hashtable.put(java.lang.Object, java.lang.Object)
     void rabc4j.RaConnectionStrategy.connect(oracle.jbo.ApplicationModule, oracle.jbo.common.ampool.SessionCookie, oracle.jbo.common.ampool.EnvInfoProvider)
     void oracle.jbo.common.ampool.ApplicationPoolImpl.connect(oracle.jbo.ApplicationModule, oracle.jbo.common.ampool.SessionCookie)
     oracle.jbo.ApplicationModule oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout(oracle.jbo.common.ampool.SessionCookie)
     oracle.jbo.ApplicationModule oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule(oracle.jbo.common.ampool.SessionCookie, boolean)
     oracle.jbo.ApplicationModule oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule(boolean, long)
     oracle.jbo.ApplicationModule oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule(boolean)
     oracle.jbo.ApplicationModule oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule()
     oracle.jbo.ApplicationModule oracle.jbo.client.Configuration.createRootApplicationModule(java.lang.String, java.lang.String, oracle.jbo.common.ampool.EnvInfoProvider)
     oracle.jbo.ApplicationModule oracle.jbo.client.Configuration.createRootApplicationModule(java.lang.String, java.lang.String)
     void rabc4j.RaActionPlanImpl.doDML(int, oracle.jbo.server.TransactionEvent)
     void oracle.jbo.server.EntityImpl.postChanges(oracle.jbo.server.TransactionEvent)
     void oracle.jbo.server.DBTransactionImpl.doPostTransactionListeners(oracle.jbo.server.TransactionEvent, com.sun.java.util.collections.ArrayList, com.sun.java.util.collections.HashMap, com.sun.java.util.collections.ArrayList, boolean, boolean)
     void oracle.jbo.server.EntityImpl.postChanges(oracle.jbo.server.TransactionEvent)
     void oracle.jbo.server.DBTransactionImpl.doPostTransactionListeners(oracle.jbo.server.TransactionEvent, com.sun.java.util.collections.ArrayList, com.sun.java.util.collections.HashMap, com.sun.java.util.collections.ArrayList, boolean, boolean)
     void oracle.jbo.server.DBTransactionImpl.postChanges(oracle.jbo.server.TransactionEvent)
     int oracle.jbo.server.DBTransactionImpl.commitInternal(boolean)
     void oracle.jbo.server.DBTransactionImpl.commit()
     int oracle.jbo.html.jsp.datatags.CommitTag.doStartTag()
     void DataHandlerComponent.jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void oracle.jsp.runtime.HttpJsp.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void oracle.jsp.runtimev2.JspPageTable.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String)
     void oracle.jsp.runtimev2.JspServlet.internalService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void oracle.jsp.runtimev2.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.GetParametersRequestDispatcher.include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.EvermindPageContext.include(java.lang.String)
     int oracle.jbo.html.jsp.datatags.ComponentTag.doStartTag()
     void AplanRpropFkLink.jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void oracle.jsp.runtime.HttpJsp.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void oracle.jsp.runtimev2.JspPageTable.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String)
     void oracle.jsp.runtimev2.JspServlet.internalService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void oracle.jsp.runtimev2.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
     void com.evermind.util.ThreadPoolThread.run()