我尝试使用 hibernate JPA 从 2 个外键在表中创建复合主键，但出现错误。我找到了一些 solution在网上但什么都没有
表之间的关系是这样的:
Table Client
clientID(PK)
FirstName
LastName
.
Table CarService
serviceID(PK)
DescriptionOfFailure
.
.
Table ServiceDepartment
clientID(PK)
serviceID(PK)
price
.
我的代码的实现如下所示:
@Entity
public class ServiceDepartmentBean implements ServiceDepartmentI {
@EmbeddedId
private ServiceDepartmentPK serviceDepartmentPK = new ServiceDepartmentPK();
@Column(name="clientID", nullable=false, updatable=false, insertable=false)
private Long client;
@Column(name="serviceId", nullable=false, updatable=false, insertable=false)
private Long service;
@Column
private double price;
.
.
.
.
public void setClient(ClientI client){
serviceDepartmentPK.setClient(client);
}
public void setService(CarServiceI service){
serviceDepartmentPK.setService(service);
}
public ClientI getClient(){
return serviceDepartmentPK.getClient();
}
public CarServiceI getService(){
return serviceDepartmentPK.getService();
}
@Entity
public class CarServiceBean implements CarServiceI {
@Id
@GeneratedValue
private long serviceId;
@Column(nullable = false)
private String descriptionOfFailure;
@OneToMany(mappedBy="service")
private List<ServiceDepartmentI> servicesDepartments;
public List<ServiceDepartmentI> getServicesDepartments() {
return servicesDepartments;
}
.
.
//set i get method
@Entity
public class ClientBean implements ClientI {
@Id
@GeneratedValue
private long clientID;
@Column(nullable = false)
private String firstName;
@Column(nullable = false)
private String lastName;
@OneToMany(mappedBy = "client")
private List<ServiceDepartmentI> servicesDepartments;
public void setServicesDepartments(List<ServiceDepartmentI> servicesDepartments) {
this.servicesDepartments = servicesDepartments;
}
public List<ServiceDepartmentI> getServicesDepartments() {
return servicesDepartments;
}
}
public class ServiceDepartmentPK implements Serializable {
@ManyToOne
private ClientI client;
@ManyToOne
private CarServiceI service;
public void setClient(ClientI client) {
this.client = client;
}
public ClientI getClient() {
return client;
}
public void setService(CarServiceI service) {
this.service = service;
}
public CarServiceI getService() {
return service;
}
}
当尝试构建应用程序时，在控制台中抛出一个错误: 堆栈跟踪:
[INFO] annotations.EntityBinder Bind entity com.fit.beans.ServiceDepartmentBean on table ServiceDepartmentBean
[ERROR] ioc.Registry Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): java.lang.NullPointerException
[ERROR] ioc.Registry Operations trace:
[ERROR] ioc.Registry [ 1] Realizing service HibernateSessionSource
[ERROR] ioc.Registry [ 2] Instantiating service HibernateSessionSource implementation via org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(Logger, List) (at HibernateSessionSourceImpl.java:36) via org.apache.tapestry5.hibernate.HibernateCoreModule.bind(ServiceBinder) (at HibernateCoreModule.java:45)
[ERROR] ioc.Registry [ 3] Invoking constructor org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(Logger, List) (at HibernateSessionSourceImpl.java:36) via org.apache.tapestry5.hibernate.HibernateCoreModule.bind(ServiceBinder) (at HibernateCoreModule.java:45) (for service 'HibernateSessionSource')
[ERROR] HibernateCoreModule.HibernateSessionSource Construction of service HibernateSessionSource failed: Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): java.lang.NullPointerException
org.apache.tapestry5.ioc.internal.OperationException: Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): java.lang.NullPointerException
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:121)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:88)
at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1121)
at org.apache.tapestry5.ioc.internal.util.ConstructionPlan.createObject(ConstructionPlan.java:60)
at org.apache.tapestry5.ioc.internal.ConstructorServiceCreator.createObject(ConstructorServiceCreator.java:61)
at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1121)
如有任何帮助，我们将不胜感激 =)
重构堆栈跟踪后的新错误:
[INFO] cfg.AnnotationBinder Binding entity from annotated class: com.fit.beans.CarServiceBean
[INFO] annotations.EntityBinder Bind entity com.fit.beans.CarServiceBean on table CarServiceBean
[INFO] cfg.AnnotationBinder Binding entity from annotated class: com.fit.beans.ServiceDepartmentBean
[INFO] annotations.EntityBinder Bind entity com.fit.beans.ServiceDepartmentBean on table ServiceDepartmentBean
[ERROR] ioc.Registry Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): No identifier specified for entity: com.fit.beans.ServiceDepartmentBean
[ERROR] ioc.Registry Operations trace:
[ERROR] ioc.Registry [ 1] Realizing service HibernateSessionSource
[ERROR] ioc.Registry [ 2] Instantiating service HibernateSessionSource implementation via org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(Logger, List) (at HibernateSessionSourceImpl.java:36) via org.apache.tapestry5.hibernate.HibernateCoreModule.bind(ServiceBinder) (at HibernateCoreModule.java:45)
[ERROR] ioc.Registry [ 3] Invoking constructor org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(Logger, List) (at HibernateSessionSourceImpl.java:36) via org.apache.tapestry5.hibernate.HibernateCoreModule.bind(ServiceBinder) (at HibernateCoreModule.java:45) (for service 'HibernateSessionSource')
[ERROR] HibernateCoreModule.HibernateSessionSource Construction of service HibernateSessionSource failed: Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): No identifier specified for entity: com.fit.beans.ServiceDepartmentBean
org.apache.tapestry5.ioc.internal.OperationException: Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): No identifier specified for entity: com.fit.beans.ServiceDepartmentBean
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:121)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:88)
at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1121)
at org.apache.tapestry5.ioc.internal.util.ConstructionPlan.createObject(ConstructionPlan.java:60)
at org.apache.tapestry5.ioc.internal.ConstructorServiceCreator.createObject(ConstructorServiceCreator.java:61)
at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1121)
at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49)
at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29)
at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46)
at org.apache.tapestry5.ioc.internal.AdvisorStackBuilder.createObject(AdvisorStackBuilder.java:63)
at org.apache.tapestry5.ioc.internal.InterceptorStackBuilder.createObject(InterceptorStackBuilder.java:54)
at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60)
at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
.
.
.
.
.
Caused by: java.lang.RuntimeException: Error invoking constructor public org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl(org.slf4j.Logger,java.util.List): No identifier specified for entity: com.fit.beans.ServiceDepartmentBean
at org.apache.tapestry5.ioc.internal.util.ConstructorInvoker.invoke(ConstructorInvoker.java:57)
at org.apache.tapestry5.ioc.internal.util.LoggingInvokableWrapper.invoke(LoggingInvokableWrapper.java:42)
at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
... 72 more
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.fit.beans.ServiceDepartmentBean
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at org.apache.tapestry5.internal.hibernate.HibernateSessionSourceImpl.<init>(HibernateSessionSourceImpl.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.tapestry5.ioc.internal.util.ConstructorInvoker.invoke(ConstructorInvoker.java:48)
... 74 more
最佳答案
从中删除构造函数
@EmbeddedId
private ServiceDepartmentPK serviceDepartmentPK;
从 ServiceDepartmentPK 类中删除@ManyToOne 注释并将字段类型设置为 long 或 int
@Embeddable
public class ServiceDepartmentPK implements Serializable {
private static final long serialVersionUID = 1L;
@Column(name="COLUMN_NAME")
private long clientId;
@Column(name="COLUMN_NAME")
private long carServiceId;
public ServiceDepartmentPK () {
}
// getters setters for client and carserver ids-s
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof ServiceDepartmentPK )) {
return false;
}
ServiceDepartmentPK castOther = (ServiceDepartmentPK )other;
return
(this.scopeId == castOther.clientId)
&& (this.scriptId == castOther.carServiceId);
}
public int hashCode() {
final int prime = 31;
int hash = 17;
hash = hash * prime + ((int) (this.clientId ^ (this.clientId>>> 32)));
hash = hash * prime + ((int) (this.carServiceId ^ (this.carServiceId>>> 32)));
return hash;
}
关于java - 如何创建复合主键 hibernate JPA？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9764204/