ClassCastException當兩個控制器在單個JSF中使用時

我正在使用Netbeans開發一個使用JPA的JSF應用程序。我創建實體類，然後通過Netbeans從實體類生成JSF頁面。它創建一個AbstractFacade，Facade擴展每個實體的抽象外觀，每個實體的控制器bean和一個JSF頁面。然後我改變並使用這些生成的代碼來創建我的邏輯。ClassCastException當兩個控制器在單個JSF中使用時

有間歇一個ClassCastException異常，當我使用一個JSF頁面內的兩個控制器豆類。但是，當我重新啓動GLassFish服務器時，這個異常消失了一段時間，並再次出現，我無法找到發生了什麼變化。例如，考慮一個實體名爲Atm的情況。它有一個屬性MedicineGroup，這也是另一個實體。當來自Atm實體的對象將通過JSF頁面保存時，我得到所有的MedicineGroups調用MedicineGroupController並將其分配給Atm對象的選定的GenericName屬性。這種邏輯運行良好，直到出現ClassCastException。

（同樣的上述方法中最JSF頁面中使用。大氣壓實體具有Vtm所的性質。AMPP具有類似於ATM櫃員機，MeasurmentUnit strengthUnit，雙強度，雙ROL等peoperties）

我還可以通過更改邏輯來完成同樣的事情，以便每個JSF頁面只有一個控制器，但是如果在同一個JSF頁面中可以引用多個控制器bean，這非常容易。

這裏有什麼問題？

我在下面列出了一些重要的代碼。

JSF頁面的相關部分。一個實體類

@Entity 
@Inheritance 
public class Vtm extends PharmaceuticalItem implements Serializable { 

@ManyToOne 
MedicineGroup medicineGroup; 

public MedicineGroup getMedicineGroup() { 
    return medicineGroup; 
} 

public void setMedicineGroup(MedicineGroup medicineGroup) { 
    this.medicineGroup = medicineGroup; 
} 



}

控制器類例子包括自動生成的轉換器的

<h:selectOneListbox id="txtGroup" value="#{vtmController.current.medicineGroup}" size="5" > 
    <f:selectItems value="#{medicineGroupController.items}" var="gp" itemValue="#{gp}" itemLabel="#{gp.name}"/> 
</h:selectOneListbox>

實施例。

@ManagedBean 
@SessionScoped 
public final class VtmController { 

@EJB 
private VtmFacade ejbFacade; 
SessionController sessionController = new SessionController(); 
List<Vtm> lstItems; 
private Vtm current; 
private DataModel<Vtm> items = null; 
private int selectedItemIndex; 
boolean selectControlDisable = false; 
boolean modifyControlDisable = true; 
String selectText = ""; 

public VtmController() { 
} 

public List<Vtm> getLstItems() { 
    return getFacade().findBySQL("Select d From Vtm d"); 
} 

public void setLstItems(List<Vtm> lstItems) { 
    this.lstItems = lstItems; 
} 

public int getSelectedItemIndex() { 
    return selectedItemIndex; 
} 

public void setSelectedItemIndex(int selectedItemIndex) { 
    this.selectedItemIndex = selectedItemIndex; 
} 

public Vtm getCurrent() { 
    if (current == null) { 
     current = new Vtm(); 
    } 
    return current; 
} 

public void setCurrent(Vtm current) { 
    this.current = current; 
} 

private VtmFacade getFacade() { 
    return ejbFacade; 
} 

public DataModel<Vtm> getItems() { 
    items = new ListDataModel(getFacade().findAll("name", true)); 
    return items; 
} 

public static int intValue(long value) { 
    int valueInt = (int) value; 
    if (valueInt != value) { 
     throw new IllegalArgumentException(
       "The long value " + value + " is not within range of the int type"); 
    } 
    return valueInt; 
} 

public DataModel searchItems() { 
    recreateModel(); 
    if (items == null) { 
     if (selectText.equals("")) { 
      items = new ListDataModel(getFacade().findAll("name", true)); 
     } else { 
      items = new ListDataModel(getFacade().findAll("name", "%" + selectText + "%", 
        true)); 
      if (items.getRowCount() > 0) { 
       items.setRowIndex(0); 
       current = (Vtm) items.getRowData(); 
       Long temLong = current.getId(); 
       selectedItemIndex = intValue(temLong); 
      } else { 
       current = null; 
       selectedItemIndex = -1; 
      } 
     } 
    } 
    return items; 

} 

public Vtm searchItem(String itemName, boolean createNewIfNotPresent) { 
    Vtm searchedItem = null; 
    items = new ListDataModel(getFacade().findAll("name", itemName, true)); 
    if (items.getRowCount() > 0) { 
     items.setRowIndex(0); 
     searchedItem = (Vtm) items.getRowData(); 
    } else if (createNewIfNotPresent) { 
     searchedItem = new Vtm(); 
     searchedItem.setName(itemName); 
     searchedItem.setCreatedAt(Calendar.getInstance().getTime()); 
     searchedItem.setCreater(sessionController.loggedUser); 
     getFacade().create(searchedItem); 
    } 
    return searchedItem; 
} 

private void recreateModel() { 
    items = null; 
} 

public void prepareSelect() { 
    this.prepareModifyControlDisable(); 
} 

public void prepareEdit() { 
    if (current != null) { 
     selectedItemIndex = intValue(current.getId()); 
     this.prepareSelectControlDisable(); 
    } else { 
     JsfUtil.addErrorMessage(new MessageProvider().getValue("nothingToEdit")); 
    } 
} 

public void prepareAdd() { 
    selectedItemIndex = -1; 
    current = new Vtm(); 
    this.prepareSelectControlDisable(); 
} 

public void saveSelected() { 
    if (selectedItemIndex > 0) { 
     getFacade().edit(current); 
     JsfUtil.addSuccessMessage(new MessageProvider().getValue("savedOldSuccessfully")); 
    } else { 
     current.setCreatedAt(Calendar.getInstance().getTime()); 
     current.setCreater(sessionController.loggedUser); 
     getFacade().create(current); 
     JsfUtil.addSuccessMessage(new MessageProvider().getValue("savedNewSuccessfully")); 
    } 
    this.prepareSelect(); 
    recreateModel(); 
    getItems(); 
    selectText = ""; 
    selectedItemIndex = intValue(current.getId()); 
} 

public void addDirectly() { 
    JsfUtil.addSuccessMessage("1"); 
    try { 

     current.setCreatedAt(Calendar.getInstance().getTime()); 
     current.setCreater(sessionController.loggedUser); 

     getFacade().create(current); 
     JsfUtil.addSuccessMessage(new MessageProvider().getValue("savedNewSuccessfully")); 
     current = new Vtm(); 
    } catch (Exception e) { 
     JsfUtil.addErrorMessage(e, "Error"); 
    } 

} 

public void cancelSelect() { 
    this.prepareSelect(); 
} 

public void delete() { 
    if (current != null) { 
     current.setRetired(true); 
     current.setRetiredAt(Calendar.getInstance().getTime()); 
     current.setRetirer(sessionController.loggedUser); 
     getFacade().edit(current); 
     JsfUtil.addSuccessMessage(new MessageProvider().getValue("deleteSuccessful")); 
    } else { 
     JsfUtil.addErrorMessage(new MessageProvider().getValue("nothingToDelete")); 
    } 
    recreateModel(); 
    getItems(); 
    selectText = ""; 
    selectedItemIndex = -1; 
    current = null; 
    this.prepareSelect(); 
} 

public boolean isModifyControlDisable() { 
    return modifyControlDisable; 
} 

public void setModifyControlDisable(boolean modifyControlDisable) { 
    this.modifyControlDisable = modifyControlDisable; 
} 

public boolean isSelectControlDisable() { 
    return selectControlDisable; 
} 

public void setSelectControlDisable(boolean selectControlDisable) { 
    this.selectControlDisable = selectControlDisable; 
} 

public String getSelectText() { 
    return selectText; 
} 

public void setSelectText(String selectText) { 
    this.selectText = selectText; 
    searchItems(); 
} 

public void prepareSelectControlDisable() { 
    selectControlDisable = true; 
    modifyControlDisable = false; 
} 

public void prepareModifyControlDisable() { 
    selectControlDisable = false; 
    modifyControlDisable = true; 
} 

@FacesConverter(forClass = Vtm.class) 
public static class VtmControllerConverter implements Converter { 

    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     VtmController controller = (VtmController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "vtmController"); 
     return controller.ejbFacade.find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuffer sb = new StringBuffer(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof Vtm) { 
      Vtm o = (Vtm) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + VtmController.class.getName()); 
     } 
    } 
} 
}

的示例的用於門面

@Stateless 
public class VtmFacade extends AbstractFacade<Vtm> { 
@PersistenceContext(unitName = "HOPU") 
private EntityManager em; 

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

public VtmFacade() { 
    super(Vtm.class); 
} 


}

生成抽象門面和我所做的更改。

public abstract class AbstractFacade<T> { 

protected Class<T> entityClass; 

public AbstractFacade(Class<T> entityClass) { 
    this.entityClass = entityClass; 
} 

protected abstract EntityManager getEntityManager(); 

public void create(T entity) { 
    getEntityManager().persist(entity); 
} 

public void edit(T entity) { 
    getEntityManager().merge(entity); 
} 

public void remove(T entity) { 
    getEntityManager().remove(getEntityManager().merge(entity)); 
} 

public T find(Object id) { 
    return getEntityManager().find(entityClass, id); 
} 

public List<T> findAll(boolean withoutRetired) { 
    return findAll(null, null, withoutRetired); 
} 

public List<T> findAll() { 
    javax.persistence.criteria.CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); 
    javax.persistence.criteria.CriteriaQuery<T> cq = cb.createQuery(entityClass); 
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass); 
    return getEntityManager().createQuery(cq).getResultList(); 
} 

public List<T> findAll(String fieldName) { 
    return findAll(fieldName, "", false); 
} 

public List<T> findAll(String fieldName, boolean withoutRetired) { 
    return findAll(fieldName, "", withoutRetired); 
} 

public List<T> findAll(String fieldName, String fieldValue) { 
    return findAll(fieldName, fieldValue, false); 
} 

public List<T> findBySQL(String temSQL) { 
    TypedQuery<T> qry = getEntityManager().createQuery(temSQL, entityClass); 
    return qry.getResultList(); 
} 


public List<T> findBySQL(String temSQL, Map<String, Date> parameters) { 
    TypedQuery<T> qry = getEntityManager().createQuery(temSQL, entityClass); 
    Set s=parameters.entrySet(); 
    Iterator it=s.iterator(); 
    while (it.hasNext()){ 
     Map.Entry m=(Map.Entry)it.next(); 
     Date pVal = (Date) m.getValue(); 
     String pPara=(String) m.getKey(); 
     qry.setParameter(pPara, pVal, TemporalType.DATE); 
     System.out.println("Parameter " + pPara + "\tVal" + pVal); 
    } 
    return qry.getResultList(); 
}  

private void test(Class myClass, Object ob) { 
} 

public List<T> findAll(String fieldName, String fieldValue, boolean withoutRetired) { 
    javax.persistence.criteria.CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); 
    javax.persistence.criteria.CriteriaQuery<T> cq = cb.createQuery(entityClass); 
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass); 
    ParameterExpression<String> p = cb.parameter(String.class); 
    Predicate predicateField = cb.like(rt.<String>get(fieldName), fieldValue); 
    Predicate predicateRetired = cb.equal(rt.<Boolean>get("retired"), false); 
    Predicate predicateFieldRetired = cb.and(predicateField, predicateRetired); 

    if (withoutRetired && !fieldValue.equals("")) { 
     cq.where(predicateFieldRetired); 
    } else if (withoutRetired) { 
     cq.where(predicateRetired); 
    } else if (!fieldValue.equals("")) { 
     cq.where(predicateField); 
    } 

    if (!fieldName.equals("")) { 
     cq.orderBy(cb.asc(rt.get(fieldName))); 
    } 

    return getEntityManager().createQuery(cq).getResultList(); 
} 

public List<T> findExact(String fieldName, String fieldValue, boolean withoutRetired) { 
    javax.persistence.criteria.CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); 
    javax.persistence.criteria.CriteriaQuery<T> cq = cb.createQuery(entityClass); 
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass); 
    ParameterExpression<String> p = cb.parameter(String.class); 
    Predicate predicateField = cb.equal(cb.upper(rt.<String>get(fieldName)), fieldValue.toLowerCase()); 
    Predicate predicateRetired = cb.equal(rt.<Boolean>get("retired"), false); 
    Predicate predicateFieldRetired = cb.and(predicateField, predicateRetired); 

    if (withoutRetired && !fieldValue.equals("")) { 
     cq.where(predicateFieldRetired); 
    } else if (withoutRetired) { 
     cq.where(predicateRetired); 
    } else if (!fieldValue.equals("")) { 
     cq.where(predicateField); 
    } 

    if (!fieldName.equals("")) { 
     cq.orderBy(cb.asc(rt.get(fieldName))); 
    } 

    return getEntityManager().createQuery(cq).getResultList(); 
} 

public T findByField(String fieldName, String fieldValue, boolean withoutRetired) { 
    List<T> lstAll = findExact(fieldName, fieldValue, true); 
    if (lstAll.isEmpty()) { 
     return null; 
    } else { 
     return lstAll.get(0); 
    } 
} 

public T findFirstBySQL(String temSQL) { 
    TypedQuery<T> qry = getEntityManager().createQuery(temSQL, entityClass); 
    try { 
     return qry.getResultList().get(0); 
    } catch (Exception e) { 
     System.out.println(e.getMessage()); 
     return null; 
    } 
} 

public <U> List<T> testMethod(U[] a, Collection<U> all) { 
    List<T> myList = new ArrayList<T>(); 
    return myList; 
} 

public <U> List<T> findAll(String fieldName, int searchID, boolean withoutRetired) { 

    javax.persistence.criteria.CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); 
    javax.persistence.criteria.CriteriaQuery<T> cq = cb.createQuery(entityClass); 
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass); 

    if (withoutRetired) { 
     cq.where(cb.and(cb.equal(rt.get("retired"), false)), 
       (cb.equal(rt.get(fieldName).get("id"), searchID))); 
    } else { 
     cq.where(cb.equal(rt.get("retired"), false)); 
    } 

    return getEntityManager().createQuery(cq).getResultList(); 
} 

public int count() { 
    javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery(); 
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass); 
    cq.select(getEntityManager().getCriteriaBuilder().count(rt)); 
    javax.persistence.Query q = getEntityManager().createQuery(cq); 
    return ((Long) q.getSingleResult()).intValue(); 
} 


public Double findAggregateDbl(String strJQL){ 
    Query q= getEntityManager().createQuery(strJQL); 
    try{ 
     return (Double) q.getSingleResult(); 
    }catch (Exception e){ 
     System.out.println(e.getMessage()); 
     return 0.0; 
    } 
} 


}

這是由異常稱爲代碼。

  AtmController controller = (AtmController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "atmController");

在不同的情況下，這個相同的地方，但不同的控制器。如果錯誤發生一次，儘管JSF頁面訪問後續字符，同一個控制器正在給出錯誤，但是在服務器重新啓動後，控制器根據發生錯誤的頁面而不同。

這是完整的堆棧跟蹤。（取決於我用它來訪問JSF頁面上的控制器類的名稱更改。）內部AtmController

INFO: java.lang.ClassCastException: gov.sp.health.bean.VtmController cannot be cast to gov.sp.health.bean.AtmController 
java.lang.ClassCastException: gov.sp.health.bean.VtmController cannot be cast to gov.sp.health.bean.AtmController 
    at gov.sp.health.bean.AtmController$VtmControllerConverter.getAsObject(AtmController.java:252) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:171) 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:202) 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:319) 
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030) 
    at javax.faces.component.UIInput.validate(UIInput.java:960) 
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1233) 
    at javax.faces.component.UIInput.processValidators(UIInput.java:698) 
    at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:508) 
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1590) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIForm.visitTree(UIForm.java:344) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601) 
    at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:376) 
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:252) 
    at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183) 
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1170) 
    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:1542) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) 
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) 
    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$AdapterCallable.call(ContainerMapper.java:317) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) 
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849) 
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746) 
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045) 
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228) 
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) 
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) 
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) 
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) 
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) 
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) 
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71) 
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) 
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) 
    at java.lang.Thread.run(Thread.java:722)

轉換

@FacesConverter(forClass = Atm.class) 
public static class AtmControllerConverter implements Converter { 

    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     AtmController controller = (AtmController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "atmController"); 
     return controller.ejbFacade.find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuffer sb = new StringBuffer(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof Atm) { 
      Atm o = (Atm) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + AtmController.class.getName()); 
     } 
    } 
}

轉換器內部的VtmController

@FacesConverter(forClass = Vtm.class) 
public static class VtmControllerConverter implements Converter { 

    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     VtmController controller = (VtmController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "vtmController"); 
     return controller.ejbFacade.find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuffer sb = new StringBuffer(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof Vtm) { 
      Vtm o = (Vtm) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + VtmController.class.getName()); 
     } 
    } 
}

的MedicineGroupController

@FacesConverter(forClass = MedicineGroup.class) 
public static class MedicineGroupControllerConverter implements Converter { 

    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     MedicineGroupController controller = (MedicineGroupController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "medicineGroupController"); 
     return controller.ejbFacade.find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuffer sb = new StringBuffer(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof MedicineGroup) { 
      MedicineGroup o = (MedicineGroup) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + MedicineGroupController.class.getName()); 
     } 
    } 
}

來源

2012-06-30 Buddhika Ariyaratne

在將來的問題中，請僅發佈*相關*代碼。 – BalusC

+1僅用於發佈相關章節。發佈的代碼量略高於頂端。 –

你是如何生成門面的？ – Thufir

內部

轉換器I轉換器用於爲每個selectOneListbox。這個錯誤不會發生在後面。下面是我用過的一個類似的例子。（不完全是非常上述相同代碼）

初始轉換

@FacesConverter(forClass = Investigation.class) 
public static class InvestigationControllerConverter implements Converter { 

    public InvestigationControllerConverter() { 
    } 

    @Override 
    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     InvestigationController controller = (InvestigationController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "investigationController"); 
     return controller.ejbFacade.find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuilder sb = new StringBuilder(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    @Override 
    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof Investigation) { 
      Investigation o = (Investigation) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + InvestigationController.class.getName()); 
     } 
    } 
}

後來我改變了它這樣。

@FacesConverter("ixcon") 
    public static class InvestigationConverter implements Converter { 

     public InvestigationConverter() { 
     } 



@Override 
    public Object getAsObject(FacesContext facesContext, UIComponent component, String value) { 
     if (value == null || value.length() == 0) { 
      return null; 
     } 
     InvestigationController controller = (InvestigationController) facesContext.getApplication().getELResolver(). 
       getValue(facesContext.getELContext(), null, "investigationController"); 
     return controller.getEjbFacade().find(getKey(value)); 
    } 

    java.lang.Long getKey(String value) { 
     java.lang.Long key; 
     key = Long.valueOf(value); 
     return key; 
    } 

    String getStringKey(java.lang.Long value) { 
     StringBuilder sb = new StringBuilder(); 
     sb.append(value); 
     return sb.toString(); 
    } 

    @Override 
    public String getAsString(FacesContext facesContext, UIComponent component, Object object) { 
     if (object == null) { 
      return null; 
     } 
     if (object instanceof Investigation) { 
      Investigation o = (Investigation) object; 
      return getStringKey(o.getId()); 
     } else { 
      throw new IllegalArgumentException("object " + object + " is of type " 
        + object.getClass().getName() + "; expected type: " + InvestigationController.class.getName()); 
      } 
     } 
    }

我在這樣的JSF頁面中使用該轉換器。

<p:autoComplete converter="ixcon" widgetVar="aIx" id="acIx" forceSelection="true" value="#{investigationItemValueFlagController.investigation}" completeMethod="#{investigationController.completeItem}" var="ix" itemLabel="#{ix.name}" itemValue="#{ix}" size="30" style="width: 400px;"> 
           <p:ajax process="acIx iif" update="iif tbl" event="itemSelect"/> 
          </p:autoComplete>

來源

2013-07-20 09:54:23

ClassCastException當兩個控制器在單個JSF中使用時

回答

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