我正在使用 Netbeans 和 Glassfish 开发 JSF 应用程序。当我更改某些内容并将 Netbeans 重新部署到 Glassfish 时，会在实体类本身上引发 ClassCastException。
Caused by: java.lang.ClassCastException: com.twibu.entity.Tipper cannot be cast to com.twibu.entity.Tipper
at com.twibu.service.TipperService.findByUseridPwd(TipperService.java:22)
这是如何引起的，我该如何解决？
作为参考，这是完整的堆栈跟踪：
WARNING: EJB5184:A system exception occurred during an invocation on EJB TipperService, method: public com.twibu.entity.Tipper com.twibu.service.TipperService.findByUseridPwd(java.lang.String,java.lang.String)
WARNING: 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 com.sun.proxy.$Proxy141.findByUseridPwd(Unknown Source)
at com.twibu.service.__EJB31_Generated__TipperService__Intf____Bean__.findByUseridPwd(Unknown Source)
at com.twibu.bean.AuthBean.login(AuthBean.java:122)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
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:722)
Caused by: java.lang.ClassCastException: com.twibu.entity.Tipper cannot be cast to com.twibu.entity.Tipper
at com.twibu.service.TipperService.findByUseridPwd(TipperService.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
... 44 more
这是实体：
@Entity
@Table(name = "tipper")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Tipper.findAll", query = "SELECT t FROM Tipper t"),
@NamedQuery(name = "Tipper.findById", query = "SELECT t FROM Tipper t WHERE t.id = :id"),
@NamedQuery(name = "Tipper.findByName", query = "SELECT t FROM Tipper t WHERE t.name = :name"),
@NamedQuery(name = "Tipper.findByUserid", query = "SELECT t FROM Tipper t WHERE t.userid = :userid"),
@NamedQuery(name = "Tipper.findByPwd", query = "SELECT t FROM Tipper t WHERE t.pwd = :pwd"),
@NamedQuery(name = "Tipper.findByEmail", query = "SELECT t FROM Tipper t WHERE t.email = :email")})
@NamedNativeQueries({
@NamedNativeQuery(name = "Tipper.findByUseridPwd", query = "" +
"SELECT a.id AS id, " +
" a.idgruppe AS idgruppe, " +
" a.name AS name, " +
" a.userid AS userid, " +
" a.pwd AS pwd, " +
" a.email AS email " +
"FROM tipper AS a " +
"WHERE a.userid = ? " +
" AND a.pwd = MD5(?)",
resultClass=Tipper.class)})
public class Tipper implements Serializable {
private static final long serialVersionUID = 20130311L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 50)
@Column(name = "name")
private String name;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 20)
@Column(name = "userid")
private String userid;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 32)
@Column(name = "pwd")
private String pwd;
// @Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="Invalid email")//if the field contains email address consider using this annotation to enforce field validation
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 50)
@Column(name = "email")
private String email;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "tipper")
private Collection<Zulassung> zulassungCollection;
@JoinColumn(name = "idgruppe", referencedColumnName = "id")
@ManyToOne(optional = false)
private Gruppe idgruppe;
public Tipper() {
}
public Tipper(Integer id) {
this.id = id;
}
public Tipper(Integer id, String name, String userid, String pwd, String email) {
this.id = id;
this.name = name;
this.userid = userid;
this.pwd = pwd;
this.email = email;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@XmlTransient
public Collection<Zulassung> getZulassungCollection() {
return zulassungCollection;
}
public void setZulassungCollection(Collection<Zulassung> zulassungCollection) {
this.zulassungCollection = zulassungCollection;
}
public Gruppe getIdgruppe() {
return idgruppe;
}
public void setIdgruppe(Gruppe idgruppe) {
this.idgruppe = idgruppe;
}
public boolean isUser() {
return idgruppe.getName().equals("user") || idgruppe.getName().equals("admin");
}
public boolean isAdmin() {
return idgruppe.getName().equals("admin");
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Tipper)) {
return false;
}
Tipper other = (Tipper) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.twibu.entity.Tipper[ id=" + id + " ]";
}
}
这是服务类：
@Singleton
public class TipperService extends AbstractService {
public Tipper findByUseridPwd(String userid, String pwd) {
Query nq = getTwibuManager().createNamedQuery("Tipper.findByUseridPwd");
nq.setParameter(1, userid);
nq.setParameter(2, pwd);
return (Tipper)nq.getSingleResult();
}
}