Zero-configuration ignores interceptor configuration
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Key: WW-2016
URL: https://issues.apache.org/struts/browse/WW-2016
Project: Struts 2
Issue Type: Bug
Components: Configuration
Affects Versions: 2.0.8
Environment: Windows XP, Tomcat 5.5.23
Reporter: Sean McRae
So I am using the GWT plug-in (http://code.google.com/p/struts2gwtplugin/) to
integrate some new GWT work into our existing Struts app. In switching to
Struts 2 we now would like to use the zero-config option and call all of our
actions using this plug-in - basically an interceptor. Unfortunately we cannot
call our actions, all named *Action, using this method as the zero-config
method and Struts' discovery of actions and the assignment of interceptors
seems to ignore the default interceptor setup (I tried redefining this in
struts-default.xml - see below) or by specifying a default interceptor.
It seems to me that Struts should do one of the following:
1) Use the defaultStack as defined (or overridden) in struts.properties and
struts-default.xml
2) Define a stack that could be overridden in struts.xml
3) Provide some other mechanism to allow the developer to override the default
zero-config interceptor stack
Issue WW-1796 addresses this in some respect, but what I would like is to
define the default interceptor stack and then used the WW-1796 feature to
override that if I need to.
Below are thing I tried to work around this issue.
1. Not deriving my package from gwt-default and struts-default so as not to get
the defaultStack interceptor stack defined in struts-default.xml. I didn't
really think this would work since the action classes aren't part of the any
defined package but I thought I would try. So my package definition looked like
this:
<package name="myPackage">
<interceptors>
<interceptor name="gwt"
class="com.pharmanet.server.struts2.GWTInterceptor" />
<interceptor-stack name="gwtStack">
<interceptor-ref name="gwt"/>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="gwtStack"/>
</package>
2. Added a struts.properties file to /WEB-INF/classes that sets the struts
configuration files property:
struts.configuration.files=pnet-struts-default.xml,struts-plugin.xml,struts.xml
and then in pnet-struts-default.xml
I defined defaultStack to only have the GWT interceptor in it. This does
not seem to help either.
Using the configuration browser plug-in (that is a nice plug-in for this work),
the interceptor stack that gets generated by Struts is this:
Name Type
ExceptionMappingInterceptor
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor
AliasInterceptor
com.opensymphony.xwork2.interceptor.AliasInterceptor
ServletConfigInterceptor
org.apache.struts2.interceptor.ServletConfigInterceptor
PrepareInterceptor
com.opensymphony.xwork2.interceptor.PrepareInterceptor
I18nInterceptor
com.opensymphony.xwork2.interceptor.I18nInterceptor
ChainingInterceptor
com.opensymphony.xwork2.interceptor.ChainingInterceptor
DebuggingInterceptor
org.apache.struts2.interceptor.debugging.DebuggingInterceptor
ProfilingActivationInterceptor
org.apache.struts2.interceptor.ProfilingActivationInterceptor
ScopedModelDrivenInterceptor
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor
ModelDrivenInterceptor
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor
FileUploadInterceptor
org.apache.struts2.interceptor.FileUploadInterceptor
CheckboxInterceptor
org.apache.struts2.interceptor.CheckboxInterceptor
StaticParametersInterceptor
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor
ParametersInterceptor
com.opensymphony.xwork2.interceptor.ParametersInterceptor
StrutsConversionErrorInterceptor
org.apache.struts2.interceptor.StrutsConversionErrorInterceptor
AnnotationValidationInterceptor
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor
DefaultWorkflowInterceptor
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor
My theory is that the zero-config code is either ignoring defaultStack settings
and making its own stack up, or Struts is not picking up on my override of
struts-default.xml (maybe I need to remove it from the JAR?). I end up getting
a ClassCastException at line 150 of
com.opensymphony.xwork2.validator.ValidationInterceptor, I am assuming this is
the point at which Struts is trying to cast my object to a Struts result
(String).
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