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我有一个级联下拉菜单，它在一个系统上运行良好，但在另一个系统上无法运行。请参考以下代码： xhtml:

<p:selectOneMenu style="width: 150px" value="#{reportBean.exchange}">
                <f:selectItem itemLabel="NSE" itemValue="nse"/>
                <f:selectItem itemLabel="BSE" itemValue="bse"/> 
                <p:ajax update="sym" listener="#{reportBean.wow()}"/>
            </p:selectOneMenu>             
        <h:outputText value="Scrip Symbol :"/>
        <p:selectOneMenu value="#{reportBean.scripID}" id="sym" style="width: 100px">
            <f:selectItem itemLabel="All" itemValue="0"/>
            <f:selectItems var="scrip" value="#{reportBean.sl}" itemLabel="#{scrip.scripSymbol}" itemValue="#{scrip.scripID}"/>
        </p:selectOneMenu>

wow() 方法没有被调用，下面是 bean 代码：

 @javax.faces.bean.ManagedBean
@javax.faces.bean.ViewScoped
 public class reportBean implements Serializable {
    @WebServiceRef(wsdlLocation = "WEB-INF/wsdl/localhost_8080/StatelessWebService/StatelessWebService.wsdl")
     transient  private StatelessWebService_Service  service ;
    private java.util.List<service.MasterScrip> getAllScripByExchange(java.lang.String exchange) {
        service.StatelessWebService port = service.getStatelessWebServicePort();
        return port.getAllScripByExchange(exchange);
    }
        public void wow()
    {    
            sl=getAllScripByExchange(exchange);
    }

我调试了一下，发现调试点来了就行了

service.StatelessWebService port = service.getStatelessWebServicePort();

并进入 InvocationTargetException.java 并进入以下方法：

public InvocationTargetException(Throwable target) {
super((Throwable)null);  // Disallow initCause
    this.target = target;
}

最后在 glassfish 中返回的错误是：

    WARNING: /ClientTemplate/tradeReport.xhtml @17,74 listener="#{reportBean.wow()}": java.lang.NullPointerException
javax.el.ELException: /ClientTemplate/tradeReport.xhtml @17,74 listener="#{reportBean.wow()}": java.lang.NullPointerException

在 managd bean 中，如果我没有实现可序列化或者我没有将服务设为瞬态，那么我会得到 NotSerializable 异常。这个错误的原因是什么？我该如何解决？ 编辑：

服务豆：

    @ManagedBean
@javax.faces.bean.RequestScoped
public class serviceBean{
    @WebServiceRef(wsdlLocation = "WEB-INF/wsdl/localhost_8080/StatelessWebService/StatelessWebService.wsdl")
    private StatelessWebService_Service service;
@ManagedProperty("#{reportBean}")
    private reportBean reportBean;

    public beans.reportBean getReportBean() {
        return reportBean;
    }

    public void setReportBean(beans.reportBean reportBean) {
        this.reportBean = reportBean;
    } //other props
    public String getExchange() {
        return exchange;
    }

    public void setExchange(String exchange) {
        this.exchange = exchange;
    }
     public void wow()
{    
        reportBean.setSl(getAllScripByExchange(reportBean.getExchange()));
}

报告豆：

  @javax.faces.bean.ManagedBean
@javax.faces.bean.ViewScoped
 public class reportBean implements Serializable {
     private Integer scripID;
     private String exchange;
     private List<service.TradeStock> tradeList;
     private List<MasterScrip> sl; //get set

现在我收到以下错误：

 SEVERE: Error Rendering View[/ClientTemplate/tradeReport.xhtml]
javax.faces.FacesException: java.io.NotSerializableException: service.MasterScrip
4

1 回答 1

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将服务调用和操作方法拆分为不同的请求范围 bean 类。将剩余部分保留在视图范围的 bean 中。最后将范围为一的视图注入到范围为一的请求中@ManagedProperty。

@ManagedBean
@RequestScoped
public class ReportActionBean {

    @WebServiceRef(wsdlLocation = "WEB-INF/wsdl/localhost_8080/StatelessWebService/StatelessWebService.wsdl")
    private StatelessWebService_Service service;

    @ManagedProperty("#{reportDataBean}")
    private ReportDataBean reportDataBean;

    // ...
}
于 2012-06-03T13:10:39.357 回答