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From: =?UTF-8?Q?=C5=81ukasz_Lenart?= <lukasz.lenart@gmail.com>
Date: Wed, 5 Nov 2014 12:54:38 +0100
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 <CAMopvkOJU1RzWps25r0XY=vP6PXryd=FB8PLCr6JS=5QCdwnhg@mail.gmail.com>
Subject: Re: Struts 2 JSON plugin change in finding the target action instance
 problem Pavel Ilyushko Original Poster Greenhorn Joined: Nov 05,
 2014 Posts: 1
To: Struts Users Mailing List <user@struts.apache.org>
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You can redefine root

http://struts.apache.org/release/2.3.x/docs/json-plugin.html#JSONPlugin-RootObject

2014-11-05 12:13 GMT+01:00 Pavel Ilyushko <pavel.ilyushko@gmail.com>:
> Hello there!
>
> Recently I've upgraded our struts2 framework and its related plugins (eg:
> json plugin) from version 2.1.8 to version 2.3.16.3.
>
> Now I'm having problems in using the json plugin while making json requests
> and returning the json responses.
>
> The problem is that the parameter values passed in the json request are not
> set on my struts 2 action any more (likewise, the return fields set in my
> action are not returned as a json string).
> Why does this happen? The problem is that a change has been made in the
> newer version of json plugin regarding to how the target action is found.
>
> 1. Consider this method:
>
> public String intercept(ActionInvocation invocation) throws Exception
>
> from the older version of the json plugin:
>
> http://grepcode.com/file/repo1.maven.org/maven2/org.apache.struts/struts2-json-plugin/2.1.8/org/apache/struts2/json/JSONInterceptor.java?av=f
>
> line 100:
>
> rootObject = invocation.getAction(); // that's why the action class
> instance is found ok in struts 2.1.8
>
> now from the newer plugin:
>
> http://grepcode.com/file/repo1.maven.org/maven2/org.apache.struts/struts2-json-plugin/2.3.16.3/org/apache/struts2/json/JSONInterceptor.java?av=f
>
> line 91:
>
> ValueStack stack = invocation.getStack();
> rootObject = stack.findValue(this.root); // the value on the top of the
> value stack is used! and this is not an action in our case (we push an
> interceptor on the top of the stack!).
>
> 2. Returning the target action's fields as the json return result:
>
> consider this method:
>
> public void execute(ActionInvocation invocation) throws Exception
>
> from the older plugin:
>
> http://grepcode.com/file/repo1.maven.org/maven2/org.apache.struts/struts2-json-plugin/2.1.8/org/apache/struts2/json/JSONResult.java?av=f
>
> line 195:
>
> rootObject = invocation.getAction(); // that's why the action class
> instance is found in struts 2.1.8
>
> from the newer plugin:
>
> http://grepcode.com/file/repo1.maven.org/maven2/org.apache.struts/struts2-json-plugin/2.3.16.3/org/apache/struts2/json/JSONResult.java?av=f
>
> line 175:
>
> rootObject = readRootObject(invocation);
>
> line 187:
>
> return findRootObject(invocation);
>
> line 193:
>
> ValueStack stack = invocation.getStack();
> rootObject = stack.findValue(root); // the value on the top of the value
> stack is an instance of our custom interceptor, not the target action!
>
> It is not clear to me why the logic of finding the target action has
> changed to popping up the value from the top of the stack.
>
> In our case this approach does not work anymore, since we have a custom
> interceptor pushed onto the top of the stack.
>
> Is there any workaround?
>
> Thanks
>
>
>
> --
> Pavel Ilyushko

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