Jakarta ee 无法将字符串转换为对象

我的webapp有一个相当困难的问题。以下是glassfish的输出：

      ATTENTION: EJB5184:A system exception occurred during an invocation on EJB           DepartementFacade, method: public jpa.Departement    ejb.DepartementFacade.getDiscountCodeSFromStringCode(java.lang.String)
      ATTENTION: javax.ejb.EJBException
at    com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5215)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5113)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4901)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2045)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1994)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:89)
at $Proxy289.getDiscountCodeSFromStringCode(Unknown Source)
at ejb.__EJB31_Generated__DepartementFacade__Intf____Bean__.getDiscountCodeSFromStringCode(Unknown Source)
at ManagaedBean.AgentBean$1.getAsObject(AgentBean.java:120)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:171)
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:202)
at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:319)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030)
at javax.faces.component.UIInput.validate(UIInput.java:960)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at org.primefaces.component.panel.Panel.processValidators(Panel.java:293)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172)
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:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at     com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:619)
    Caused by: java.lang.IllegalArgumentException: You have attempted to set a value of type class java.lang.Character for parameter idDept with expected type of class java.lang.String from query string SELECT d FROM Departement d WHERE d.idDept = :idDept.

我真的需要你的帮助 这是Xhtml文件：

   <h:selectOneMenu id="idDept" value="#{agentBean.agentministere.idDept}" title="IdDept" converter="#{agentBean.departementConverter}" >

                                        <f:selectItems value="#{agentBean.allDepartements}"/>  
    </h:selectOneMenu>

}

原因：java.lang.IllegalArgumentException:您试图为参数idDept设置一个类型为class java.lang.Character的值，该参数的类型应为查询字符串中的class java.lang.String选择d，其中d.idDept=：idDept

很明显，应该有字符串而不是字符

试试这个：

query.setParameter("idDept", idDepth);

getAsObject包含以下行

char code = value.charAt(0);

---

我确信您不必在getDiscountCodeSFromStringCode中重复它

您应该将您发布的代码减少到导致错误的原因

  package ejb;

   import javax.ejb.Stateless;
   import javax.persistence.EntityManager;
   import javax.persistence.PersistenceContext;
   import javax.persistence.Query;
   import jpa.Departement;


@Stateless
public class DepartementFacade extends AbstractFacade<Departement> {
@PersistenceContext(unitName = "NvApplication_PArc-ejbPU")
private EntityManager em;

@Override
protected EntityManager getEntityManager() {
    return em;
}

public DepartementFacade() {
    super(Departement.class);
}

   public Departement getDiscountCodeSFromStringCode(String idDept) 
{
    System.out.println("JE CHERCHE Id Dept " + idDept);
    Query query = em.createNamedQuery("Departement.findByIdDept");
    query.setParameter("idDept", new Character(idDept.charAt(0)));
    return (Departement) query.getSingleResult();
}

query.setParameter("idDept", idDepth);

char code = value.charAt(0);