java.lang.NullPointerExceptionorg.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:108) in JBoss EAP 7

Issue

• We are migrating an old web application to JBoss EAP 7 and seeing this exception:

ERROR [io.undertow.request] (default task-9) UT005023: Exception handling request to /example.jsp: java.lang.RuntimeException: java.lang.NullPointerException
  at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:245)
  at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImplSetup(RequestDispatcherImpl.java:147)
  at io.undertow.servlet.spec.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111)
  at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
  at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
  at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:254)
  at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:309)
  at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
  at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
  at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
...
Caused by: java.lang.NullPointerException
  at org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:108)
  at test.example_jsp._jspx_meth_tiles_insert_0(example_jsp.java:87)
  at test.example_jsp._jspService(example_jsp.java:47)
  at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
  at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)