在JSF 2.0中调用方法的方法签名？

时间：2011-05-09 08:25:58

标签： jsf jsf-2

当从EL调用JSF Bean时，我对JSF Bean中的方法签名有疑问。

在下面的示例中，我在outputText value属性和actionListener＆amp;＆amp;命令Button的action属性。

<p:dataTable id="gridRPBDetails" 
    var="rpbDetail"
    value="#{tInputBean.detailList}"
    selection="#{tInputBean.selectedDetails}">

    ....

    <p:column selectionMode="multiple" />
    <p:column>
        <h:outputText value="#{tInputBean.isNewRecord(rpbDetail) ? 'New' : tInputBean.isEditRecord(rpbDetail) ? 'Edited' : '-'}"/>
    </p:column>
    <p:column>
        <p:commandButton 
            process="@this"
            actionListener="#{tInputBean.activateDetail(rpbDetail)}" 
            action="#{tInputBean.querySubAnggaranListImpl(rpbDetail.map['subBudget.budget'])}" 
            update="DetailDialogForm"
            oncomplete="detailDialog.show();" 
            image="ui-icon ui-icon-search"/>
    </p:column>

    ....

奇怪的是，actionListener="#{tInputBean.activateDetail(rpbDetail)}"和action="#{tInputBean.querySubAnggaranListImpl(rpbDetail.map['subBudget.budget'])}"都可以使用自定义类型作为参数（在这种情况下，它是my.package.Dto类型）：

public void activateDetail(Dto activeDetail) {
    ....
}
public void querySubAnggaranListImpl(Dto budget) {
    DebugUtil.start("querySubAnggaranListImpl");
    ....
    DebugUtil.end("querySubAnggaranListImpl");
}

其中isNewRecord方法需要java.lang.Object：

public boolean isNewRecord(Dto record) { // this does NOT work
    ....
}

这是生成的痕迹：

ERROR BusinessExceptionHandler - javax.el.ELException: /TInput.xhtml @156,130 value="#{tInputBean.isNewRecord(rpbDetail) ? 'New' : tInputBean.isEditRecord(rpbDetail) ? 'Edited' : '-'}": java.lang.NoSuchMethodException: id.co.sofcograha.cashbank.webapp.paymentplan.TInputBean.isNewRecord(java.lang.Object)
javax.el.ELException: /TInput.xhtml @156,130 value="#{tInputBean.isNewRecord(rpbDetail) ? 'New' : tInputBean.isEditRecord(rpbDetail) ? 'Edited' : '-'}": java.lang.NoSuchMethodException: id.co.sofcograha.cashbank.webapp.paymentplan.TInputBean.isNewRecord(java.lang.Object)
        at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114)
        at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:193)
        at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:181)
        at javax.faces.component.UIOutput.getValue(UIOutput.java:169)
        at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
        at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
        at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
        at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:883)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
        at org.primefaces.component.datatable.DataTableRenderer.encodeRegularCell(DataTableRenderer.java:571)
        at org.primefaces.component.datatable.DataTableRenderer.encodeRow(DataTableRenderer.java:531)
        at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:472)
        at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:201)
        at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:180)
        at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:85)
        at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:883)
        at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:59)
        at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:43)
        at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:229)
        at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:152)
        at org.primefaces.component.panel.PanelRenderer.encodeEnd(PanelRenderer.java:75)
        at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:883)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
        at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:853)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1652)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
        at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:399)
        at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NoSuchMethodException: id.co.sofcograha.cashbank.webapp.paymentplan.TInputBean.isNewRecord(java.lang.Object)
        at java.lang.Class.getMethod(Class.java:1605)
        at javax.el.BeanELResolver.invoke(BeanELResolver.java:405)
        at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:161)
        at org.apache.el.parser.AstValue.getValue(AstValue.java:159)
        at org.apache.el.parser.AstChoice.getValue(AstChoice.java:45)
        at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
        at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
        ... 52 more
DEBUG DebugUtil - ************ END printing stack trace ************

但是如果我添加这个方法，一切都会顺利进行：

public boolean isNewRecord(Object o) { // this DOES work
    return isNewRecord((Dto) o);
}

基本问题是： 为什么从JSF调用方法有时可以接受自定义类型，有时不接受？

顺便说一句，即时通讯使用tomcat 7，这些是我的依赖项：

<dependency>
    <groupId>org.primefaces</groupId>
    <artifactId>primefaces</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-api</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-impl</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>

谢谢！

1 个答案:

答案 0 :(得分：1)

这是针对EL实现的。根据我在一个演示文稿中听到的内容，规范并不完全清楚这种情况，因此实现者必须做出决定。

但是Tomcat的实现应该如你所愿。尝试将tomcat升级到最新版本，并确保WEB-INF/lib

中没有EL jar
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