javax.faces.FacesException : Error performing conversion of value-6ren

javax.faces.FacesException : Error performing conversion of value

转载作者：太空宇宙更新时间：2023-11-04 07:26:13

当我使用 sakai 2.9 cle 使用inf JSF 和 Spring 创建新工具时，出现“javax.faces.FacesException:执行值转换时出错”错误。

这是我的堆栈跟踪:

org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: org.apache.jasper.JasperException: javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:894)
    caused by: org.sakaiproject.tool.api.ToolException: org.apache.jasper.JasperException: javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1483)
    caused by: org.apache.jasper.JasperException: javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
    caused by: javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:143)
    caused by: javax.faces.FacesException: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:97)
    caused by: javax.faces.FacesException: Error performing conversion of value 'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' of type 'class com.sun.proxy.$Proxy61' to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' for managed bean 'AttendanceTool'.
        at com.sun.faces.config.ManagedBeanFactory.getConvertedValueConsideringPrimitives(ManagedBeanFactory.java:885)
        at com.sun.faces.config.ManagedBeanFactory.setPropertiesIntoBean(ManagedBeanFactory.java:575)
        at com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:253)
        at com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:282)
        at com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:97)
        at org.sakaiproject.jsf.app.SakaiVariableResolver.resolveVariable(SakaiVariableResolver.java:76)
        at com.sun.faces.el.impl.NamedValue.evaluate(NamedValue.java:145)
        at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:166)
        at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:263)
        at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:160)
        at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:143)
        at javax.faces.component.UIComponentBase$AttributesMap.get(UIComponentBase.java:1397)
        at org.sakaiproject.jsf.attendance.AttendanceIfNotRender.encodeBegin(AttendanceIfNotRender.java:43)
        at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:703)
        at javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:613)
        at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:565)
        at org.apache.jsp.attendance.main_jsp._jspx_meth_attendance_005fattendance_005fifnot_005f0(main_jsp.java:393)
        at org.apache.jsp.attendance.main_jsp._jspx_meth_h_005fform_005f0(main_jsp.java:302)
        at org.apache.jsp.attendance.main_jsp._jspx_meth_sakai_005fview_005fcontent_005f0(main_jsp.java:272)
        at org.apache.jsp.attendance.main_jsp._jspx_meth_sakai_005fview_005fcontainer_005f0(main_jsp.java:230)
        at org.apache.jsp.attendance.main_jsp._jspx_meth_f_005fview_005f0(main_jsp.java:195)
        at org.apache.jsp.attendance.main_jsp._jspService(main_jsp.java:141)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
        at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:346)
        at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:152)
        at org.sakaiproject.jsf.app.SakaiViewHandler.renderView(SakaiViewHandler.java:159)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:107)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:268)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:137)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:214)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:634)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
        at org.sakaiproject.tool.attendance.AttendanceFilePickerServlet.dispatch(AttendanceFilePickerServlet.java:158)
        at org.sakaiproject.jsf.util.JsfTool.doGet(JsfTool.java:241)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:634)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
        at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:511)
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1483)
        at org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:213)
        at org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:96)
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:894)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:695)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
        at java.lang.Thread.run(Thread.java:662)

我的 faces-config.xml 是

    <?xml version="1.0"?>
<!DOCTYPE faces-config PUBLIC
  "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
  "http://java.sun.com/dtd/web-facesconfig_1_0.dtd">

<faces-config>

  <application>
    <message-bundle>org.sakaiproject.tool.attendance.bundle.Messages</message-bundle>
    <locale-config>
      <default-locale>en</default-locale>
      <supported-locale>de</supported-locale>
      <supported-locale>fr</supported-locale>
      <supported-locale>es</supported-locale>
    </locale-config>
  </application>

<!--sakai2 - take this out. <application>
    <view-handler>
      org.sakaiproject.jsf.custom.SakaiViewHandler
    </view-handler>
    <navigation-handler>
      org.sakaiproject.jsf.custom.SakaiNavigationHandler
    </navigation-handler>
    <variable-resolver>
      org.sakaiproject.jsf.custom.SakaiVariableResolver
    </variable-resolver>
    <state-manager>
      org.sakaiproject.jsf.custom.SakaiStateManager
    </state-manager>
  </application> -->

  <!-- =================== Tool Beans ============== -->
    <managed-bean>

        <description>AttendanceTool</description>
        <managed-bean-name>AttendanceTool</managed-bean-name>
        <managed-bean-class>org.sakaiproject.tool.attendance.AttendanceTool</managed-bean-class>
<!--sakai2      <managed-bean-scope>request</managed-bean-scope>-->
        <managed-bean-scope>session</managed-bean-scope>

        <managed-property>
            <description>attendanceManager</description>
            <property-name>attendanceManager</property-name>
            <value>#{Components["org.sakaiproject.api.app.attendance.AttendanceManager"]}</value>
        </managed-property>

<!--        <managed-property>
            <description>logger</description>
            <property-name>logger</property-name>
            <value>#{Components["org.sakaiproject.service.framework.log.Logger"]}</value>
        </managed-property>-->
        <managed-property>
            <description>attendanceService</description>
            <property-name>attendanceService</property-name>
            <value>#{Components["org.sakaiproject.api.app.attendance.AttendanceService"]}</value>
        </managed-property>    
        <managed-property>
            <description>contentHostingService</description>
            <property-name>contentHostingService</property-name>
            <value>#{Components["org.sakaiproject.content.api.ContentHostingService"]}</value>
        </managed-property> 
    </managed-bean>

  <component>
    <component-type>SakaiAttendanceTable</component-type>
    <component-class>org.sakaiproject.jsf.attendance.AttendanceTableComponent</component-class>
  </component>

  <component>
    <component-type>SakaiAttendanceIframe</component-type>
    <component-class>org.sakaiproject.jsf.attendance.AttendanceIframeComponent</component-class>
  </component>

  <component>
    <component-type>SakaiAttendanceIf</component-type>
    <component-class>org.sakaiproject.jsf.attendance.AttendanceIfComponent</component-class>
  </component>

  <component>
    <component-type>SakaiAttendanceIfNot</component-type>
    <component-class>org.sakaiproject.jsf.attendance.AttendanceIfNotComponent</component-class>
  </component>

  <component>
    <component-type>AttendanceShowArea</component-type>
    <component-class>org.sakaiproject.jsf.attendance.AttendanceShowAreaComponent</component-class>
  </component>

  <render-kit>
    <renderer>
      <component-family>SakaiAttendanceIframe</component-family>
      <renderer-type>SakaiAttendanceIframeRender</renderer-type>
      <renderer-class>org.sakaiproject.jsf.attendance.AttendanceIframeRender</renderer-class>
    </renderer>

    <renderer>
      <component-family>SakaiAttendanceIf</component-family>
      <renderer-type>SakaiAttendanceIfRender</renderer-type>
      <renderer-class>org.sakaiproject.jsf.attendance.AttendanceIfRender</renderer-class>
    </renderer>

    <renderer>
      <component-family>SakaiAttendanceIfNot</component-family>
      <renderer-type>SakaiAttendanceIfNotRender</renderer-type>
      <renderer-class>org.sakaiproject.jsf.attendance.AttendanceIfNotRender</renderer-class>
    </renderer>

    <renderer>
      <component-family>AttendanceShowArea</component-family>
      <renderer-type>AttendanceShowAreaRender</renderer-type>
      <renderer-class>org.sakaiproject.jsf.attendance.AttendanceShowAreaRender</renderer-class>
    </renderer>
  </render-kit>

  <navigation-rule>
    <from-view-id>/attendance/main.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/main_edit.jsp</from-view-id>
    <navigation-case>
      <from-outcome>read</from-outcome>
      <to-view-id>/attendance/read.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>delete_confirm</from-outcome>
      <to-view-id>/attendance/delete_confirm.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>edit</from-outcome>
      <to-view-id>/attendance/edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>edit_redirect</from-outcome>
      <to-view-id>/attendance/edit_redirect.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>main</from-outcome>
      <to-view-id>/attendance/main.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/delete_confirm.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/main_student.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/edit_redirect.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/edit.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>preview</from-outcome>
      <to-view-id>/attendance/preview.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>edit</from-outcome>
      <to-view-id>/attendance/edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>add_attach</from-outcome>
      <to-view-id>/attendance/add_attach.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>remove_attach_confirm</from-outcome>
      <to-view-id>/attendance/remove_attach_confirm.jsp</to-view-id>
      <redirect/>
    </navigation-case>  
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/read.jsp</from-view-id>
    <navigation-case>
      <from-outcome>main_edit</from-outcome>
      <to-view-id>/attendance/main_edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>permission_error</from-outcome>
      <to-view-id>/attendance/permission_error.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>read_preview</from-outcome>
      <to-view-id>/attendance/read_preview.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>read</from-outcome>
      <to-view-id>/attendance/read.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>add_attach</from-outcome>
      <to-view-id>/attendance/add_attach.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>remove_attach_confirm</from-outcome>
      <to-view-id>/attendance/remove_attach_confirm.jsp</to-view-id>
      <redirect/>
    </navigation-case>  
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/preview.jsp</from-view-id>
    <navigation-case>
      <from-outcome>edit</from-outcome>
      <to-view-id>/attendance/edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>preview</from-outcome>
      <to-view-id>/attendance/preview.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/read_preview.jsp</from-view-id>
    <navigation-case>
      <from-outcome>read_preview</from-outcome>
      <to-view-id>/attendance/read_preview.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>read</from-outcome>
      <to-view-id>/attendance/read.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/add_attach.jsp</from-view-id>
    <navigation-case>
      <from-outcome>edit</from-outcome>
      <to-view-id>/attendance/edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>read</from-outcome>
      <to-view-id>/attendance/read.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <from-view-id>/attendance/remove_attach_confirm.jsp</from-view-id>
    <navigation-case>
      <from-outcome>edit</from-outcome>
      <to-view-id>/attendance/edit.jsp</to-view-id>
      <redirect/>
    </navigation-case>
    <navigation-case>
      <from-outcome>read</from-outcome>
      <to-view-id>/attendance/read.jsp</to-view-id>
      <redirect/>
    </navigation-case>
  </navigation-rule>

</faces-config>

最佳答案

这是一个 JSF 错误，与 Sakai 无关。这里重要的问题是这个:

Error performing conversion of value 
'org.sakaiproject.component.app.attendance.AttendanceManagerImpl@721c3e' 
of type 'class com.sun.proxy.$Proxy61' 
to type 'interface org.sakaiproject.api.app.attendance.AttendanceManager' 
for managed bean 'AttendanceTool'

通常，这是由于多个类加载器中存在 API 副本而导致的。检查以确保您的 JSF 工具和共享中没有该 API jar(并检查您是否没有该 jar 的 2 个版本)。

关于javax.faces.FacesException : Error performing conversion of value，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18502694/

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有没有人有嵌套 Intent 的好例子，尤其是在 #yes 和 #no 是子节点的情况下。我得到的情况是 API 返回的是 Intent 值，但输出文本来自“Anything else”! 最佳答案
watson-conversation - 是否有一种编程方式可以导出 Watson Conversation 的意图？
我知道您可以转到 Watson Conversation 界面，右键单击工作区，然后下载工作区的 JSON，其中包含意图，如下所示:Is there any way to export intents
watson-conversation - 在为 Watson Conversation API 流创建流时，我可以使用意图的置信度评级吗？
我能否在 Watson Conversation API 的对话流中使用节点条件中的意图置信度评级？最佳答案要做到这一点，请创建一个条件来寻找您的意图，然后检查置信度。你会拥有的示例条件 #te
c++ - 错误 83 错误 C2398 : conversion from 'double' to 'float' requires a narrowing conversion
我找到了很多关于这个错误的帖子，但我可以找到克服它的方法。这是触发错误的代码: void main(){ float f{1.3}; } 为什么在初始化列表中没有像其他变量那样发生转换？例如，
c++ - Derived pointer to Base pointer conversion using static_cast, dynamic_cast, or explicit conversion 不会调用基函数
我有以下代码。 #include using namespace std; class Base { public: virtual int f(){coutf(); ///base
c++ - 不一致的警告 "conversion from ' const unsigned char' to 'const float' requires a narrowing conversion”
Visual C++ 2017 和 gcc 5.4 产生 conversion from 'const unsigned char' to 'const float' requires a narro
c - Microchip XC8 警告 "conversion to shorter data type"和 "implicit conversion signed to unsigned"
我正在为 PIC18F2420 使用带有 xc8 1.35 编译器的 MPLABX 3.20，我收到了两个我不理解的奇怪警告: 这是生成警告的源代码之一 9 void write(Pin _Pin,
c++ - 在 visual studio 2015 community c++ 中，如何修复警告 C4838 : conversion from 'unsigned int' to 'int' requires a narrowing conversion
我正在尝试在 win32 API(无 mfc)上编写一些直接的 c++。有了这个更现代的 c++ 编译器，我得到: 警告 C4838:从“unsigned int”到“int”的转换需要收缩转换它发
编译错误 'incompatible pointer to integer conversion passing ' int (int, int )' to parameter of type ' int' [-Wint-conversion]"
此代码采用用户输入(字符 C、T、B)和(int 0-24 和 0-60)来计算 parking 成本关于用户输入的车辆类型。我怀疑错误发生在函数 charged 中，因此我无法在收到此错误的最后一
type-conversion - 元组与元组
为什么在使用 tuple 或 Tuple 转换向量时会得到以下不同的结果？ julia> a = [1, 2, 3] 3-element Vector{Int64}: 1 2 3 julia> tup
code-conversion - 如何管理代码转换？
关闭。这个问题是opinion-based .它目前不接受答案。想改善这个问题吗？更新问题，以便可以通过 editing this post 用事实和引文回答问题. 8年前关闭。 Improve t
document-conversion - 如何预览文件？
我正在开发一个文件共享网站，我需要一种方法来对上传的文档进行截图。该站点将支持多种文件格式，从纯文本到办公文档(doc、xls、ppt...)、视频(mpeg、avi...)、图像(jpg、gif、
type-conversion - 整数到实数转换函数
在 VHDL 中是否有将整数类型对象转换为实数类型的通用转换函数？这是针对测试平台的，因此可综合性不是问题。最佳答案您可以将整数转换为实数，如下所示: signal i: integer; si
type-conversion - 字符串选项到字符串转换
如何在 Ocaml 中将字符串选项数据类型转换为字符串？ let function1 data = match data with None -> "" | Some str -> s
type-conversion - SRA不能有这样的操作数吗？
我已经在 VHDL 中编写了一个算法，但是我有一条消息，我不明白“sra/sla 在这种情况下不能有这样的操作数。”。请问有什么帮助吗？ library ieee; use ieee.std_logi
type-conversion - 比较任意两项的最有效运算符是什么？
我经常需要将数据从一种类型转换为另一种类型，然后进行比较。一些运算符会先转换为特定类型，这种转换可能会导致效率损失。例如，我可能有 my $a, $b = 0, "foo"; # initial va
watson-conversation - 沃森没有得到零
假设我在 IBM Watson 中配置了一个对话服务，可以识别以单词和片段形式给出的数字。例如，如果我有号码 1320 , 可以发送为 thirteen twenty或 thirteen two ze
type-conversion - 转换容器类型？
也许我错过了一些显而易见的事情...在整个文档中，我似乎都认为Kotlin具有各种类型的序列，这些序列不能互操作。即使复制序列可能效率不高–当我需要将其作为语义相同但不同的类型传递给函数时，这也无济于
c++ - QTcpSocket模拟netcat 'conversation'
在我的Linux终端中，我想要使用QTcpSocket从qt运行以下“对话”: S user@domain:~ $ netcat 1.1.1.2 9230 R HELO SOME MORE I
c++ - "Conversion"从类型到相同类型导致错误
我有一个模板函数，其中枚举类型转换为它的底层类型，工作正常，但我写了一个重载，它应该接受一个整数并返回它自己，它给我一个错误，指出 int 不是枚举类型。在我的模板中，这应该已经被过滤掉了。怎么了？

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javax.faces.FacesException : Error performing conversion of value