我想为产品添加新的出价，但出于某种原因，当我点击该按钮时，会抛出nullpointerexception。我尝试了不同的东西，但似乎都没有。我正在使用richfaces 4.3.7.Final
我的xhtml
<?xml version="1.0" encoding="UTF-8"?>
<!--
To change this template, choose Tools | Templates
and open the template in the editor.
-->
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:rich="http://richfaces.org/rich"
xmlns:a4j="http://richfaces.org/a4j">
<h:body>
<ui:composition template="../template.xhtml">
<ui:define name="content">
<rich:tabPanel switchType="client">
<rich:tab name="Details">
<h:form>
<rich:panel>
<h:panelGrid columns="2" id="registerGroupPanel">
<h:outputLabel value="#{msg.productName}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.item.productName}"/>
<h:outputLabel value="#{msg.description}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.details.description}"/>
<h:outputLabel value="#{msg.category}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.item.category}"/>
<h:outputLabel value="#{msg.brand}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.item.brand}"/>
<h:outputLabel value="#{msg.defect}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.details.defect}"/>
<h:outputLabel value="#{msg.priceModel}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.details.priceModel}"/>
<h:outputLabel value="#{msg.bidDueDate}"/>
<h:outputLabel value="#{repairDetailsBean.selectedRepair.details.dueDate.toGregorianCalendar().time.toGMTString()}">
<f:convertDateTime pattern="dd-MM-yyyy HH:mm" />
</h:outputLabel>
</h:panelGrid>
</rich:panel>
</h:form>
</rich:tab>
<rich:tab name="Bids">
<h:form>
<rich:panel>
<h:panelGrid columns="2" id="registerGroupPanel">
<rich:dataTable value="#{repairDetailsBean.bids}" var="bid" rows="25" id="table">
<rich:column>
<f:facet name="header">
<h:panelGroup>
<h:outputText value="Repairer name"/>
</h:panelGroup>
</f:facet>
<h:outputText value="#{bid.getRepairer().getPerson().getFirstname()} #{bid.getRepairer().getPerson().getLastname()}"/>
</rich:column>
<rich:column>
<f:facet name="header">
<h:panelGroup>
<h:outputText value="Rating"/>
</h:panelGroup>
</f:facet>
<h:outputText value="#{bid.getRepairer().getOveralRating()}"/>
</rich:column>
<rich:column>
<f:facet name="header">
<h:panelGroup>
<h:outputText value="Price"/>
</h:panelGroup>
</f:facet>
<h:outputText value="#{bid.price}"/>
</rich:column>
</rich:dataTable>
</h:panelGrid>
</rich:panel>
</h:form>
</rich:tab>
<rich:tab name="Add bid">
<h:form>
<rich:panel>
<p>Bid price</p>
<rich:inputNumberSpinner id="price" value="#{repairDetailsBean.price}">
<f:validateRequired />
<rich:validator/>
</rich:inputNumberSpinner>
<rich:message for="price" style="color: red;"/>
<p></p>
<a4j:commandButton value="Submit" action="#{repairDetailsBean.placeNewBid}"/>
<h:commandButton action="#{repairDetailsBean.placeNewBid}" value="Place new bid">
<param name="faces-redirect" value="true"/>
</h:commandButton>
<h:commandButton action="#{repairDetailsBean.placeNewBid()}" value="Place new bid met haakjes">
<param name="faces-redirect" value="true"/>
</h:commandButton>
</rich:panel>
</h:form>
</rich:tab>
</rich:tabPanel>
</ui:define>
</ui:composition>
</h:body>
</html>
我的豆子
@Component("repairDetailsBean")
@Scope("session")
public class RepairDetailsBean implements Serializable{
private Repair selectedRepair;
private Date date;
private List<Bid> bids;
private Bid bid;
private double price = 0.0;
private RepairService repairService;
private User user;
private Repairer repairer;
@Autowired
@Qualifier("userBean")
private UserBean userBean;
private UserService userService;
public void initRepairDetails(){
setBids(selectedRepair.getBids());
}
public void formatDate(){
setDate(selectedRepair.getDetails().getDueDate().toGregorianCalendar().getTime());
}
public String placeNewBid(){
try {
user = userService.getUser(userBean.getUsername());
} catch (UserServiceException ex) {
Logger.getLogger(RepairDetailsBean.class.getName()).log(Level.SEVERE, null, ex);
}
repairer = (Repairer) user;
repairService.placeBid(repairer, selectedRepair, price);
return "placeBidCompleted";
}
错误消息
FATAL: JSF1073: javax.faces.FacesException caught during processing of INVOKE_APPLICATION 5 : UIComponent-ClientId=, Message=#{repairDetailsBean.placeNewBid()}: java.lang.NullPointerException
FATAL: #{repairDetailsBean.placeNewBid()}: java.lang.NullPointerException
javax.faces.FacesException: #{repairDetailsBean.placeNewBid()}: java.lang.NullPointerException
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:89)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.FacesException: #{repairDetailsBean.placeNewBid()}: java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
... 30 more
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 34 more
Caused by: java.lang.NullPointerException
at be.kdg.repaircafe.beans.RepairDetailsBean.placeNewBid(RepairDetailsBean.java:73)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.el.ELUtil.invokeMethod(ELUtil.java:326)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:536)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:269)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 35 more
答案 0 :(得分：0)
您的repairService显然为null，如果您启用了CDI，或者至少需要手动实例化，则需要通过添加@Inject正确注入。