原因：没有为名称为“成功”的“链”类型定义结果类型

Question

尝试使用 Chaining.Exception 时出现异常

<action name="chain1" class="leo.struts.Chain1Action">

<!-- Chain Result configuration starts -->
    <package name="interceptorpackage">
        <interceptors>
            <interceptor name="chainingintercept1" class="leo.struts.SimpleInterceptor" />
            <interceptor name="chainingintercept2" class="leo.struts.LoggingInterceptor">
                <param name="name">leo</param>
            </interceptor>
            <interceptor name="chainingintercept3" class="leo.struts.ChainInterceptor" />
        </interceptors>
    </package>
    <package name="public" extends="interceptorpackage">
        <action name="chain1" class="leo.struts.Chain1Action">
            <interceptor-ref name="chainingintercept1"/>
            <result type="chain">chain2</result>
        </action>

        <action name="chain2" class="leo.struts.Chain2Action">
            <!-- Chain to another namespace -->
            <interceptor-ref name="chainingintercept2"/>
            <result type="chain">
                <param name="actionName">chain3</param>
                <param name="namespace">/secure</param>
            </result>
        </action>
    </package>

    <package name="secure" extends="interceptorpackage" namespace="/secure">
        <action name="chain3" class="leo.struts.Chain3Action">
                <interceptor-ref name="chainingintercept3"/>
            <result >noresultend.jsp</result>
        </action>
    </package>
    <!-- Chain Result configuration starts -->

例外：

SEVERE: Exception starting filter struts2
Error building results for action chain1 in namespace  - action - file:/D:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Strut2Examples/WEB-INF/classes/struts.xml:135:57
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:340)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:429)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4726)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: There is no result type defined for type 'chain' mapped with name 'success' - result - file:/D:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Strut2Examples/WEB-INF/classes/struts.xml:137:25
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildResults(XmlConfigurationProvider.java:584)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:338)
    ... 26 more

Answer 1

如果您在结果配置中定义类型，则结果类型的值应在包配置中定义或继承自超级包。结果类型"chain" 定义在您的基本包应继承的包"struts-default" 中。如果您不想使用默认结果类型，则可以根据 DTD 定义自己的类型。

<package name="interceptorpackage" extends="struts-default" abstract="true">
  <result-types>
    <result-type name="chain" class="com.opensymphony.xwork2.ActionChainResult"/>
  <result-types>

在此配置中，结果类型 "chain" 在父包 "struts-default" 中定义，并在您的包中被覆盖。定义一个足以继承结果类型或定义自己的结果类型并有可能覆盖它的结果类型。