Application deployed in JBoss EAP 6.x Threws exception: java.lang.illegalArgumentException

Issue

After migrating from EAP 4.3 to EAP 6.2, the application (*.war) throws out exception message when printing.
The exception is as below:

15:08:45,238 DEBUG [org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (http-/xxx.xx.x.xxx:xxxx-x) OracleERDS: returnConnection(77fb5458, false) [1/20]
15:08:45,240 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/er].[default]] (http-/xxx.xx.x.xxx:xxxx-x) JBWEB000236: Servlet.service() for servlet default threw exception: java.lang.IllegalArgumentException: Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the <param name="inputName"> tag specified for this action.
        at org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:189) [struts2-core-2.0.9.jar:]
        at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178) [struts2-core-2.0.9.jar:]
        at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:348) [xwork-2.0.4.jar:]
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253) [xwork-2.0.4.jar:]
        at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:50) [struts2-core-2.0.9.jar:]
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:504) [struts2-core-2.0.9.jar:]
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419) [struts2-core-2.0.9.jar:]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
        at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
        at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_13]

15:09:31,878 DEBUG [org.apache.catalina.session] (ContainerBackgroundProcessor[StandardEngine[jboss.web]]) Start expire sessions StandardManager at 1431414571878 sessioncount 0
15:09:31,878 DEBUG [org.apache.catalina.session] (ContainerBackgroundProcessor[StandardEngine[jboss.web]]) End expire sessions StandardManager processingTime 0 expired sessions: 0