將相同組件的值傳遞給p：ajax監聽器：「PropertyNotFoundException」

Question

我已經在括號內輸入了值（'06717-100'），並且該方法正在工作，但我不知道如何將相同組件的值作爲參數傳遞。我希望用戶在p:inputMask中鍵入一個郵政編碼，當焦點丟失（或 - 會更好 - 當達到最大字段長度時），將調用在數據庫中搜索它的方法。

<h:form id="frm"> 

    <h:panelGrid> 

    <p:outputPanel autoUpdate="true" 
       id="pnl"> 

     <p:inputMask id="txtCep" 
      mask="99999-999" 
      placeholder="Digite o CEP" 
      value="#{cepMB.cep.cep}"> 
     <p:ajax event="blur" 
      listener="#{cepMB.busca('06717-100')}" 
      process="@this" 
      update="frm:pnl" /> 
     </p:inputMask> 

及以下方法busca的代碼：

public void busca(String cep) { 
    Cep c = this.cepRepository.findByCep(cep); 
    if(c.getId() != null) { 
     this.cep = c; 
    } 
} 

我使用JSF 2.2，PrimeFaces 4.0，GlassFish的4.0與2.1 JPA休眠4.3.1。

堆棧跟蹤：

Advertência: javax.el.PropertyNotFoundException: /principal.xhtml @59,31 value="#{cepMB.cep.cep}": Target Unreachable, 'null' returned null 
javax.faces.FacesException: javax.el.PropertyNotFoundException: /principal.xhtml @59,31 value="#{cepMB.cep.cep}": Target Unreachable, 'null' returned null 
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:270) 
    at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:57) 
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1193) 
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) 
    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:744) 
Caused by: javax.el.PropertyNotFoundException: /principal.xhtml @59,31 value="#{cepMB.cep.cep}": Target Unreachable, 'null' returned null 
    at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:100) 
    at org.primefaces.util.ComponentUtils.getConverter(ComponentUtils.java:124) 
    at org.primefaces.renderkit.InputRenderer.getConvertedValue(InputRenderer.java:183) 
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1046) 
    at javax.faces.component.UIInput.validate(UIInput.java:976) 
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1249) 
    at javax.faces.component.UIInput.processValidators(UIInput.java:712) 
    at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:552) 
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIForm.visitTree(UIForm.java:371) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:399) 
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:263) 
    ... 33 more 
Caused by: javax.el.PropertyNotFoundException: Target Unreachable, 'null' returned null 
    at com.sun.el.parser.AstValue.getTarget(AstValue.java:192) 
    at com.sun.el.parser.AstValue.getType(AstValue.java:86) 
    at com.sun.el.ValueExpressionImpl.getType(ValueExpressionImpl.java:201) 
    at org.jboss.weld.el.WeldValueExpression.getType(WeldValueExpression.java:93) 
    at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:98) 
    ... 50 more 

#{cepMB.cep}指實體Cep，和#{cepMB.cep.cep}指Ceppublic String getCep()。

Answer 1

更改您的JSF代碼：

<p:inputMask id="txtCep" 
    mask="99999-999" 
    placeholder="Digite o CEP" 
    value="#{cepMB.cep.cep}"> 
<p:ajax event="blur" 
    listener="#{cepMB.busca(cepMB.cep.cep)}" 
    process="@this" 
    update="frm:pnl" /> 
</p:inputMask> 

此外，請確保您的cep場在cepMB總是有權利不null值初始化：

@ManagedBean 
@ViewScoped 
public class CepMB { 
    Cep cep; 
    @PostConstruct 
    public void init() { 
     cep = new Cep(); 
    } 
    //rest of your getters, setters, code... 
}