I think your tag has a leak of attribute "method"
Your code:
<s:submit key="btn.search" />
will generate HTML likes:
<input type="submit" name="btn.search" value="Search"/>
When you click this button, there will be a http request parameter
like "btn.search=Search".
Struts2 will accept this parameter, and try to save it to your action property.
So, there will be a property setting, which cause method invoking likes:
YourAction.getBtn().setSearch("Search")
But your action does not have a property named "btn",
so getBtn() will get a null, and of cause the setSearch part will fail.
If you add a "method" attribute to submit tag, like:
<s:submit key="btn.search" method="search" />
It will generate HTML like:
<input type="submit" value="Search" name="method:search" />
Notice, the "name" is now "method:search"
So, when you click this button, the http request will be:
"method:search=Search".
Struts will recognize the prefix "method:", so it know that this is a
flag to specify which method to execute, but not a input data which
need to be set in to property of Action.
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