Unexpected Exception caught setting ‘xxx’ on ‘class xxx: Error setting expression ‘xxx’ with value [‘x’, ]

No array problem is involved here (even if it seems like that): this kind of exception means that Struts can’t find a Setter for your parameter: From ParametersInterceptor documentation: Warning on missing parameters When there is no setter for given parameter name, a warning message like below will be logged in devMode: SEVERE: Developer Notification … Read more