Question

在使用JSF集成创建我的第一个swf应用程序时，我收到以下错误：在第一次请求解析我的流定义时无法加载类'dataModel'。

虽然我的webflow应用程序上下文中包含<faces:flow-builder-services/>标记，但是在尝试查找该别名的类时，似乎没有调用FacesConversionService（理解'dataModel'别名的类）。

在尝试找出原因时进行一些调试，我注意到以下内容：

上下文加载器侦听器加载包含<faces:flow-builder-services/>的xml文件，并注册facesConversionService bean
正确调用流处理程序映射和适配器，并将请求转发到预期的流，该定义是动态创建的。
在为流创建内部基础结构对象时，swf会在侦听器加载的应用程序上下文之上创建Web应用程序上下文。这个新的wac包含swf作用域的定义等，并且将上面的监听器应用程序上下文作为父级。
找到并解析了我的流的流定义文件，当它试图找到evaluate元素的结果类型的类时，转换服务不知道'dataModel'别名。

实际上，最后一点有趣的是转换服务要么在上面第3点创建的应用程序上下文中被查找为本地bean，要么在未找到 - 在父流构建器上下文中查找

faces转换服务既不是上下文的本地bean（它在流上下文的父上下文中注册），也不是注册为流构建器上下文的转换服务（至少是创建的FlowBuilderContextImpl）通过<flow:flow-registry/>元素。）

有人知道出了什么问题吗？

我不认为它与应用程序服务器有关，但为了以防万一，我在websphere 6.1.0.23上运行，使用spring 2.5.6和webflow 2.0.8.RELEASE。

以下是我的配置文件：

的web.xml：

<listener>
  <listener-class>
    org.springframework.web.context.ContextLoaderListener
  </listener-class>
</listener>
<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>/WEB-INF/applicationContext-*.xml</param-value>
</context-param>
...
<servlet>
  <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value></param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
  <url-pattern>/swf/*</url-pattern>
</servlet-mapping>

MVC部分的Bean定义（/WEB-INF/applicationContext-webmvc.xml）：

<bean class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
  <property name="flowRegistry" ref="flowRegistry" />
  <property name="defaultHandler">
    <bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />
  </property>
</bean>

<bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
  <property name="flowExecutor" ref="flowExecutor" />
</bean>

<bean id="faceletsViewResolver" 
  class="org.springframework.web.servlet.view.UrlBasedViewResolver">
  <property name="viewClass" value="org.springframework.faces.mvc.JsfView" />
  <property name="prefix" value="/WEB-INF/" />
  <property name="suffix" value=".jspx" />
</bean>

<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />

swf部分的Bean定义（/WEB-INF/applicationContext-webflow.xml）：

<flow:flow-registry id="flowRegistry" base-path="/WEB-INF/flows">
  <flow:flow-location path="/navigation/navigation.xml"/>
  <flow:flow-location path="/edition/edition.xml"/>
</flow:flow-registry>

<flow:flow-executor id="flowExecutor">
  <flow:flow-execution-listeners>
      <flow:listener ref="jpaFlowExecutionListener" criteria="edition"/>
  </flow:flow-execution-listeners>
</flow:flow-executor>

<faces:flow-builder-services id="facesFlowBuilderServices" development="true"/>

<bean id="jpaFlowExecutionListener" 
        class="org.springframework...JpaFlowExecutionListener">
  <constructor-arg ref="entityManagerFactory" />
  <constructor-arg ref="transactionManager" />
</bean>

异常的堆栈跟踪：

[Servlet Error]-[Spring MVC Dispatcher Servlet]: java.lang.IllegalArgumentException: Unable to load class 'dataModel'                                                                
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.toClass(FlowModelFlowBuilder.java:965)                                                                    
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.parseEvaluationActionResultExposer(FlowModelFlowBuilder.java:867)                                         
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.parseEvaluateAction(FlowModelFlowBuilder.java:858)                                                        
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.parseActions(FlowModelFlowBuilder.java:834)                                                               
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.parseAndAddViewState(FlowModelFlowBuilder.java:547)                                                       
 at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.buildStates(FlowModelFlowBuilder.java:207)                                                                
 at org.springframework.webflow.engine.builder.FlowAssembler.directAssembly(FlowAssembler.java:106)                                                                                 
 at org.springframework.webflow.engine.builder.FlowAssembler.assembleFlow(FlowAssembler.java:91)                                                                                    
 at org.springframework.webflow.engine.builder.DefaultFlowHolder.assembleFlow(DefaultFlowHolder.java:109)                                                                           
 at org.springframework.webflow.engine.builder.DefaultFlowHolder.getFlowDefinition(DefaultFlowHolder.java:84)                                                                       
 at org.springframework.webflow.definition.registry.FlowDefinitionRegistryImpl.getFlowDefinition(FlowDefinitionRegistryImpl.java:61)                                                
 at org.springframework.webflow.executor.FlowExecutorImpl.launchExecution(FlowExecutorImpl.java:138)                                                                                
 at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:193)                                                                                  
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)                                                                                        
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)                                                                                         
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)                                                                                      
 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)                                                                                               
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)

Answer 1

我遇到了同样的问题，但这是因为我指定了自己的转化服务，该服务扩展了DefaultConversionService而不是FacesConversionService。

Answer 2

我忘了在flow上指定flow-builder-services属性：flow-registry element !!!现在工作得很好。

<flow:flow-registry id="flowRegistry" base-path="/WEB-INF/flows" flow-builder-services="facesFlowBuilderServices">
   <flow:flow-location path="/navigation/navigation.xml"/>
   <flow:flow-location path="/edition/edition.xml"/>
</flow:flow-registry>

<faces:flow-builder-services id="facesFlowBuilderServices" development="true"/>

转换'dataModel'时找不到面转换服务

2 个答案: