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From "Kyle Braak (JIRA)" <>
Subject [jira] [Created] (WW-4323) Ability to accept params purely by implementing ParamNameAware is broken
Date Mon, 14 Apr 2014 12:51:14 GMT
Kyle Braak created WW-4323:

             Summary: Ability to accept params purely by implementing ParamNameAware is broken
                 Key: WW-4323
             Project: Struts 2
          Issue Type: Bug
    Affects Versions:
         Environment: struts2 version
            Reporter: Kyle Braak

The ability to accept params purely by implementing ParamNameAware is broken.

Relates to which is when this feature was added
for version 2.3.5

The commit that breaks this feature is:


Prior to this change/ it was quite convenient to define what parameters my action
should accept, by implementing ParameterNameAware#acceptableParameterName. With this change,
there is the additional requirement that the parameter names must also satisfy acceptableName(name).

In the ParametersInterceptor javadoc, it says: "if you wish to apply a global rule that isn't
implemented in your action, then you could extend this interceptor and override the {@link
#acceptableName(String)} method." So this isn't suitable for customizing a single action.

Looking more carefully at the code, another alternative to defining what parameters my action
can accept, looks to be via populating the ParametersInterceptor's field acceptParams. Apparently
this could be done in the interceptor stack from what I have read here:

By forcing one to populate acceptParams, and also implement ParameterNameAware#acceptableParameterName
it becomes quite difficult to add custom behavior. I understand people should fully understand
what they are doing due to the security risks involved, but it is probably safer to define
the behavior in a single place.

I'd greatly appreciate your help understanding how to adapt to this change. In the meantime,
I'll have to continue using


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