java.lang.ClassCastException：不能转换为java.util.List的

Question

我有两个类是有关系@一对多（薪酬和斯普利特），代码如下：

@Entity 
@Table(name="pagamento") 
public class Pagamento implements Serializable { //Class Pay 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
@Column(name="idpagamento") 
private int id; 
... 
@ManyToOne() 
@JoinColumn(name="idconta") 
private Divida coddivida; 

及以下类拆分

@Entity 
@Table(name="divida") 
public class Divida implements Serializable{ 

@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
@Column(name = "idconta") 
private int id; 
... 
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER,     mappedBy="coddivida",  targetEntity = Pagamento.class) 
private List<Pagamento> pagamento; 

而且我通过下面的数据代码搜索：

public List<Divida> getDividas(){ 
    return getCleanListOfObjects(Divida.class,"from Divida divida"); 
} 

而且我想在数据表中显示为如下：

<p:dataTable id="paneluser" value="#{dividaFaces.listofDivida}" var="divida" selection="#{dividaFaces.selectedDivida}" 
        rowKey="#{divida.id}" selectionMode="sigle" emptyMessage="Não existe Dívida" paginator="true" rows="10"> 
      <f:facet name="header"> 
       Panel de Dívidas Cadastradas 
      </f:facet> 
      <p:column headerText="Descricão"> 
       #{divida.descricao} 
      </p:column> 
      <p:column id="pagar" headerText="Tela de Pagamento"> 
       <p:commandButton value="Pagar"> 
        <p:ajax oncomplete="pagetela.show()" update="telapgamento"/> 
       </p:commandButton> 
      </p:column> 
      <f:facet name="footer"> 
       Financé v#{sistema.VERSION} 
      </f:facet> 
     </p:dataTable> 

但它给下面的错误：

Hibernate: 
/* 
from 
Divida divida */ select 
    divida0_.idconta as idconta0_, 
    divida0_.datadeinicio as datadein2_0_, 
    divida0_.descricaodespesa as descrica3_0_, 
    divida0_.empresa as empresa0_, 
    divida0_.exercicio as exercicio0_, 
    divida0_.observacao as observacao0_, 
    divida0_.operacaobancaria as operacao7_0_, 
    divida0_.parcela as parcela0_, 
    divida0_.tipolancamento as tipolanc9_0_, 
    divida0_.vencimento as vencimento0_ 
from 
    divida divida0_ 
Lista de Dividas: [] 
Hibernate: 
/* 
from 
Divida divida */ select 
    divida0_.idconta as idconta0_, 
    divida0_.datadeinicio as datadein2_0_, 
    divida0_.descricaodespesa as descrica3_0_, 
    divida0_.empresa as empresa0_, 
    divida0_.exercicio as exercicio0_, 
    divida0_.observacao as observacao0_, 
    divida0_.operacaobancaria as operacao7_0_, 
    divida0_.parcela as parcela0_, 
    divida0_.tipolancamento as tipolanc9_0_, 
    divida0_.vencimento as vencimento0_ 
    from 
    divida divida0_ 
    Mar 26, 2013 8:34:31 PM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException 
    SEVERE: Error Rendering View[/menu/principal.xhtml] 
    java.lang.ClassCastException: br.com.finance.model.Divida cannot be cast to java.util.List 
at org.primefaces.component.datatable.DataTable.findSelectedRowKeys(DataTable.java:977) 
at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:624) 
at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:234) 
at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:196) 
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:82) 
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) 
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) 
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:439) 
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124) 
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) 
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) 
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
at java.lang.Thread.run(Thread.java:722) 

谁能帮助我？

Answer 1

您正在使用selectionMode =“sigle”。请单独注意缺失的'n'。你在这里包含的异常与Hibernate无关。