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Error formatting macro: snippet: java.lang.NullPointerException

Parameters

Error formatting macro: snippet: java.lang.NullPointerException

Example

<interceptors>
    ... 
    <interceptor name="parameterFilter" class="com.opensymphony.xwork2.interceptor.ParameterFilterInterceptor"/>
    ... 
</interceptors>

<action ....> 
     ... 
     <interceptor-ref name="parameterFilter"> 
          <param name="blocked">person,person.address.createDate,personDao</param> 
     </interceptor-ref> 
     ... 
</action>
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