Caused by: java.lang.IllegalArgumentException: unknown reserved key '_typeConverter'

Question

I am getting the below error while I am trying to login to my Struts application. This is occurring after upgrading my Struts libraries to latest.

Please share any information which will help me fix this. Previous version of Struts was 2.3.10. The newer version is 2.5.10.1.

 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

Answer 1

You are using wrong version of the OGNL library. Use Maven or equivalent to manage dependencies. Or download Essential Dependencies Only to see which version of the OGNL you need to use with the Struts 2.5.10.1.