Caused by: java.lang.IllegalArgumentException: unknown reserved key '_typeConverter'
at ognl.OgnlContext.put(OgnlContext.java:536)
at ognl.Ognl.setTypeConverter(Ognl.java:346)
at com.opensymphony.xwork2.ognl.OgnlUtil.setProperty(OgnlUtil.java:225)
at com.opensymphony.xwork2.ognl.OgnlReflectionProvider.setProperty(OgnlReflectionProvider.java:90)
at org.apache.struts2.factory.StrutsResultFactory.setParameter(StrutsResultFactory.java:67)
at org.apache.struts2.factory.StrutsResultFactory.setParameters(StrutsResultFactory.java:52)
at org.apache.struts2.factory.StrutsResultFactory.buildResult(StrutsResultFactory.java:41)
at com.opensymphony.xwork2.ObjectFactory.buildResult(ObjectFactory.java:220)
at com.opensymphony.xwork2.DefaultActionInvocation.createResult(DefaultActionInvocation.java:215)
... 18 more