3

对于我当前的项目，我正在使用 JSF、Seam 和 Hibernate，但我遇到了 seam 问题。

我创建了一个带有输入字段（用于 productionMonth）的 XHTML 文件，并在其上定义了一个验证器以确保正确的用户输入。我还在现场启用了 ajax 支持，以使验证更加用户友好。

然后我创建了我的操作类（从我的 XHTML 引用）并添加了属性“productionMonth”和我需要的验证器。

现在，当我部署这个案例时，一切似乎都很好。但是：我在 productionMonth 字段中输入一个值，然后按 Enter 以提交我的表单。有时（当我足够快而我的电脑足够慢时）我会遇到异常：

Target Unreachable, identifier 'sateiFileHome' resolved to null"

奇怪的是

  1. 这只能在 IE 中重现（我使用的是 IE8）
  2. 当我删除 ajax 支持标签时，我没有错误，所以它一定与 ajax 相关

我对问题原因的最佳猜测是 AJAX 调用和提交是同时启动的。因此，其中一个调用无法解析对操作类的引用。但是为什么它只在 IE 中呢？

我也尝试使用 Hibernate 验证，但仍然是同样的问题！

我用谷歌搜索了这个问题，但找不到任何对我有帮助的东西。这里有什么猜测吗？

我的动作课：

@Name("sateiFileHome")
@Scope(ScopeType.CONVERSATION)
public class SateiFileHome extends CustomHome<Satei> {
    ...
    private Integer productionMonth = 0;
    ...
    public Integer getProductionMonth() {
        return productionMonth;
    }

public void setProductionMonth(Integer productionMonth) {
    this.productionMonth = productionMonth;
}
    ...
/* VALIDATORS */
public void validateProductionMonth(final FacesContext context,
        final UIComponent comp, final Object inputValue)
        throws ValidatorException {
    DateValidator.validateYearMonth(inputValue, false);
    this.productionMonth = Integer.parseInt(String.valueOf(inputValue));
}
    ...
}

我的 XHTML 文件：

<s:decorate id="productionMonthField" template="layout/edit.xhtml">
    <ui:define name="label">Production Month</ui:define>
    <h:inputText id="productionMonth" 
            value="#{sateiFileHome.productionMonth}" 
            validator=#{sateiFileHome.validateProductionMonth}
            required="true"
            size="7"
            maxlength="6">
                    <a:support event="onblur" reRender="productionMonthField"/>
    </h:inputText>
</s:decorate>

例外（仅可在 IE8 中重现）：

Caused by javax.el.PropertyNotFoundException with message: "/SateiFile.xhtml @123,48 value="#{sateiFileHome.versionCode}": Target Unreachable, identifier 'sateiFileHome' resolved to null"

和完整的堆栈跟踪：

Exception during request processing:
Caused by javax.servlet.ServletException with message: "/SateiFile.xhtml @123,48 value="#{sateiFileHome.versionCode}": Target Unreachable, identifier 'sateiFileHome' resolved to null"
javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
java.lang.Thread.run(Thread.java:619)
Caused by javax.el.PropertyNotFoundException with message: "/SateiFile.xhtml @123,48 value="#{sateiFileHome.versionCode}": Target Unreachable, identifier 'sateiFileHome' resolved to null"
com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.java:62)
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:92)
com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:188)
com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:301)
javax.faces.component.UIInput.getConvertedValue(UIInput.java:942)
javax.faces.component.UIInput.validate(UIInput.java:868)
javax.faces.component.UIInput.executeValidate(UIInput.java:1072)
javax.faces.component.UIInput.processValidators(UIInput.java:672)
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
javax.faces.component.UIForm.processValidators(UIForm.java:235)
org.ajax4jsf.component.AjaxViewRoot$3.invokeContextCallback(AjaxViewRoot.java:447)
org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:240)
org.ajax4jsf.component.AjaxViewRoot.processValidators(AjaxViewRoot.java:463)
com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
java.lang.Thread.run(Thread.java:619)
4

2 回答 2

2

将 bean 放在页面范围而不是会话范围中解决了这个问题。我们使用了对话范围，但我们没有离开页面，所以我们意识到对话范围并不是真正需要的。页面范围就足够了，它解决了问题。不要问我为什么以及如何，但它确实有效。

于 2011-10-13T07:18:48.110 回答
0

我会尝试几件事。

1) 应该

 validator=#{sateiFileHome.validateProductionMonth}

在属性值周围有引号？

 validator="#{sateiFileHome.validateProductionMonth}"

2) 弄清楚对话从哪里开始，是否确实有对话正在进行。它仅在 IE 中的事实可能意味着这不是问题。

3）您是否尝试过添加

immediate="true"

到 ajax 标签？

4）您也可以尝试将验证移至另一个类。这将使它更有用一点，然后验证就不会在对话范围的 bean 上。

5）您还可以实现自己的 javax.faces.validator.Validator 并将其作为标签添加到您的输入中。这意味着可以替换验证器 =“#{sateiFileHome.validateProductionMonth}”。

希望这里有帮助。

于 2011-10-12T12:11:52.570 回答