THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- I get an error like "There is no Action mapped for namespace /orders and action name view.". This means that the URL /orders/view.action is not mapping to any action class. Check the namespace and the name of the action.
- I get an error like "No result defined for action "my.example.actions.orders.ViewAction and result success". This means that the action was mapped to the right URL, but the Convention plugin was unable to find a success result for it. Check that the result file exists, like /WEB-INF/content/orders/view-success.jsp.
- I get lots of errors like "java.lang.Exception: Could not load org/apache/velocity/runtime/resource/loader/ClasspathResourceLoader.class". This happens when struts.convention.action.includeJars is matching jar URLs from external jars.
Overwriting plugin classes
The Convention plugin can be extended in the same fashion that Struts does. The following beans are defined by default:
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<bean type="org.apache.struts2.convention.ActionConfigBuilder" name="convention" class="org.apache.struts2.convention.PackageBasedActionConfigBuilder"/>
This interface defines how the action configurations for the current web application can be constructed. This must find all actions that are not specifically defined in the struts XML files or any plugins. Furthermore, it must make every effort to locate all action results as well.
<bean type="org.apache.struts2.convention.ActionNameBuilder" name="convention" class="org.apache.struts2.convention.SEOActionNameBuilder"/>
This interface defines the method that is used to create action names based on the name of a class.
<bean type="org.apache.struts2.convention.ResultMapBuilder" name="convention" class="org.apache.struts2.convention.DefaultResultMapBuilder"/>
This interface defines how results are constructed for an Action. The action information is supplied and the result is a mapping of ResultConfig instances to the result name.
<bean type="org.apache.struts2.convention.InterceptorMapBuilder" name="convention" class="org.apache.struts2.convention.DefaultInterceptorMapBuilder"/>
This interface defines how interceptors are built from annotations.
<bean type="org.apache.struts2.convention.ConventionsService" name="convention" class="org.apache.struts2.convention.ConventionsServiceImpl"/>
This interface defines the conventions that are used by the convention plugin. In most cases the methods on this class will provide the best default for any values and also handle locating overrides of the default via the annotations that are part of the plugin.
<constant name="struts.convention.actionConfigBuilder" value="convention"/>
<constant name="struts.convention.actionNameBuilder" value="convention"/>
<constant name="struts.convention.resultMapBuilder" value="convention"/>
<constant name="struts.convention.interceptorMapBuilder" value="convention"/>
<constant name="struts.convention.conventionsService" value="convention"/>
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To plugin a different implementation for one of these classes, implement the interface, define a bean for it, and set the appropriate constant's value with the name of the new bean, for example:
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<bean type="org.apache.struts2.convention.ActionNameBuilder" name="MyActionNameBuilder" class="example.SultansOfSwingNameBuilder"/>
<constant name="struts.convention.actionNameBuilder" value="MyActionNameBuilder"/>
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Configuration reference
Add a constant element to your struts config file to change the value of a configuration setting, like:
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