我正在测试我的新应用程序，当我点击我的表单上的一个按钮时，我有一个问题，它有一个表格，我总是检查一个值，如果它是真的它渲染，如果不是它，并且注册数据按钮。问题是我通过脚本删除表的一些数据，当我点击按钮时它给我一个空指针异常。在日志文件中，它表示它再次呈现页面，然后转到按钮的特定功能，因为我在尝试再次呈现页面时已经删除了数据，给我一个错误500.
这是我的表：
<h:panelGroup id="tab1" rendered="#{DataControl.tabIndex == 1}">
<h:dataTable>
<h:column>
<h:commandButton disabled="#{DataControl.CheckDelete(item.intIdAddress)}" />
</h:column>
</h:dataTable>
<h:commandButton action="#{DataControl.AddAddress}" />
</h:panelGroup>
<h:panelGroup id="tab2" rendered="#{DataControl.tabIndex == 2}">
< Refister Form >
</h:panelGroup>
这是我的checkDelete函数：
public boolean CheckDelete() {
Util.getLog().info("CheckDelete for id : "+ id);
if (id.render)
return true;
else
return false;
}
这是我的AddAddress函数：
public String AddAddress(){
Util.getLog().info("Go to Register Div");
tabIndex = 2;
}
当我在表单中的日志文件并单击按钮时：
Enter to filter : Has Session
CheckDelete for id : 1
CheckDelete for id : 2
CheckDelete for id : 3
CheckDelete for id : 4
Go to Register Div
当我删除数据N°2时，Logs文件是（我在表单中，删除数据，然后我点击按钮）：
Enter to filter : Has Session
CheckDelete for id : 1
javax.el.ELException: /pages/session/account_settings.xhtml @101,253 disabled="#{GeneralDataControl.VerificaEliminacion(item.intIdAddress)}": java.lang.NullPointerException
javax.faces.FacesException: javax.el.ELException: /pages/session/account_settings.xhtml @101,253 disabled="#{GeneralDataControl.VerificaEliminacion(item.intIdAddress)}": java.lang.NullPointerException
at javax.faces.component.UIComponentBase$AttributesMap.get(UIComponentBase.java:2214)
at com.sun.faces.util.Util.componentIsDisabledOrReadonly(Util.java:418)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.shouldDecode(HtmlBasicRenderer.java:739)
at com.sun.faces.renderkit.html_basic.ButtonRenderer.decode(ButtonRenderer.java:77)
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:791)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1048)
at javax.faces.component.UIData.iterate(UIData.java:1477)
at javax.faces.component.UIData.processDecodes(UIData.java:980)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1043)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1043)
at javax.faces.component.UIForm.processDecodes(UIForm.java:212)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1043)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1043)
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:920)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:74)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1213)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1154)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
at com.alignet.wallet.cliente.filter.FiltroHibernate.doFilter(FiltroHibernate.java:90)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:848)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:691)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:654)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:526)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:764)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:133)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:457)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:515)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:300)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:102)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1593)
Caused by: javax.el.ELException: /pages/session/account_settings.xhtml @101,253 disabled="#{GeneralDataControl.VerificaEliminacion(item.intIdAddress)}": java.lang.NullPointerException
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:111)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)
at javax.faces.component.html.HtmlCommandButton.isDisabled(HtmlCommandButton.java:183)
at sun.reflect.GeneratedMethodAccessor489.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:619)
at javax.faces.component.UIComponentBase$AttributesMap.get(UIComponentBase.java:2206)
... 44 more
Caused by: java.lang.NullPointerException
at com.alignet.wallet.cliente.web.GeneralDataJSFAction.VerificaEliminacion(GeneralDataJSFAction.java:388)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:619)
at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:737)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:246)
at com.sun.el.parser.AstValue.getValue(AstValue.java:111)
at com.sun.el.parser.AstValue.getValue(AstValue.java:163)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:106)
... 50 more
似乎jsf总是渲染页面之前做提交，我不知道如何解决这个问题。我认为是配置的事情。
我使用过滤器（唯一的过滤器）检查用户的会话，然后使用“doFilter”让响应继续。
谢谢你的时间。