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Modern IDEs provide excellent support for debugging. In addition, the framework provides support for inspecting framework-specific objects at runtime.

The DebuggingInterceptor Debugging Interceptor provides two three debugging modes to provide insight into the data behind the page. The xml mode formats relevant framework objects as an XML document. The console mode provides a OGNL command line that accepts entry of runtime expressions, and the browser mode adds an interactive page that display objects from the Value Stack.

To use the debugging, first be sure that devmode is struts.devMode is set to true is enabled through the struts.properties file or struts.

...

xml file, like:

Code Block
xml
xml
<constant name="struts.devMode" value="true" />

Then, whenever a page needs debugging, add ?debug=xml or ?debug=console or ?debug=browser to the URL.

Code Block
xml
xml

- <debug>
  <parameters /> 
- <context>
- <struts.actionMapping>
  <class>class org.apache.struts2.dispatcher.mapper.ActionMapping</class> 
  <name>showcase</name> 
  <namespace>/</namespace> 
  </struts.actionMapping>
  <attr /> 
  <__devMode>true</__devMode> 
  <report.conversion.errors>false</report.conversion.errors> 
  </context>
  <request /> 
  <session /> 
- <valueStack>
- <value>
  <actionErrors /> 
  <actionMessages /> 
  <class>class com.opensymphony.xwork2.ActionSupport</class> 
  <errorMessages /> 
  <errors /> 
  <fieldErrors /> 
- <locale>
  <ISO3Country>USA</ISO3Country> 
  <ISO3Language>eng</ISO3Language> 
  <class>class java.util.Locale</class> 
  <country>US</country> 
  <displayCountry>United States</displayCountry> 
  <displayLanguage>English</displayLanguage> 
  <displayName>English (United States)</displayName> 
  <displayVariant /> 
  <language>en</language> 
  <variant /> 
  </locale>
  </value>
- <value>
  <class>class com.opensymphony.xwork2.DefaultTextProvider</class> 
  </value>
  </valueStack>
  </debug>

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