我正在研究Java项目，现在有几天这个问题了：
我正在使用OpenJPA，我尝试通过一个额外的列来保持多对多关系。我有一个可以具备多种技能的员工。技能可以按级别进行评分。因此，我有一个EmployeeSkill类，其ID来自员工，技能和级别。
当我尝试对员工坚持技能时，会出现此错误。我尝试了所有级联操作，但没有任何效果，我不知道该怎么办。 ：
//*[text()="100"]员工实体
openjpa-3.1.0-rafcec21a1d489dff682a3ce7986fac6a1c80e8e0 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: The given instance "mijnsrc.app.entity.Employee-1" is not managed by this context.
FailedObject: mijnsrc.app.entity.Employee-1
at org.apache.openjpa.kernel.BrokerImpl.getStateManagerImpl(BrokerImpl.java:4817)
at org.apache.openjpa.kernel.BrokerImpl.persistInternal(BrokerImpl.java:2719)
at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2707)
at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2690)
at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2592)
at org.apache.openjpa.kernel.DelegatingBroker.persist(DelegatingBroker.java:1197)
at org.apache.openjpa.persistence.EntityManagerImpl.persist(EntityManagerImpl.java:837)
at mijnsrc.app.persistence.Dao.insert(Dao.java:30)
at mijnsrc.app.controller.EmployeeSkillController.setSkillToEmployee(EmployeeSkillController.java:33)
at mijnsrc.app.service.EmployeeSkillService.setSkillToEmployee(EmployeeSkillService.java:26)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.openejb.server.cxf.rs.PojoInvoker.performInvocation(PojoInvoker.java:43)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:104)
at org.apache.openejb.server.cxf.rs.AutoJAXRSInvoker.invoke(AutoJAXRSInvoker.java:68)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267)
at org.apache.openejb.server.cxf.rs.CxfRsHttpListener.doInvoke(CxfRsHttpListener.java:258)
at org.apache.tomee.webservices.CXFJAXRSFilter.doFilter(CXFJAXRSFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.openejb.server.httpd.EEFilter.doFilter(EEFilter.java:65)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.tomee.catalina.OpenEJBSecurityListener$RequestCapturer.invoke(OpenEJBSecurityListener.java:97)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:835)
技能实体
@Entity
@Table(name = "employee")
public class Employee implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "employee_id")
private int employeeId;
@Column(
name = "first_name",
nullable = false
)
private String firstname;
@Column(
name = "last_name",
nullable = false
)
private String lastname;
@Column(
name = "email",
nullable = false
)
private String email;
@Column(
name = "phone",
nullable = false
)
private String phone;
@Column(name = "is_active")
private int isActive;
@Column(name = "made_inactive_on")
private String madeInactiveOn;
@OneToMany(mappedBy = "employee", cascade = CascadeType.ALL)
private Set<EmployeeSkill> skills;
@Transient
@ManyToOne
private Education education;
public Employee() {
}
public Employee(String firstname, String lastname, String email, String phone, Education education) {
this.firstname = firstname;
this.lastname = lastname;
this.email = email;
this.phone = phone;
this.education = education;
this.isActive = 1;
}
public Employee(int id, String firstname, String lastname, String email, String phone, Education education) {
this.employeeId = id;
this.firstname = firstname;
this.lastname = lastname;
this.email = email;
this.phone = phone;
this.education = education;
}
public void addSkill(Skill skill, int level) {
EmployeeSkill employeeSkill = new EmployeeSkill(this, skill, level);
skills.add(employeeSkill);
EmployeeSkill
@Entity
@Table(name = "skill")
public class Skill implements Serializable {
@Id
@GeneratedValue
@Column(name = "skill_id")
private int skillId;
@Column(name = "skill_name", unique=true)
private String skillName;
@OneToMany(mappedBy = "skill", cascade = CascadeType.ALL)
private Set<EmployeeSkill> employees;
EmployeeSkillKey
@Entity
@Table(name = "employee_skill")
public class EmployeeSkill {
@EmbeddedId
private EmployeeSkillKey id;
@ManyToOne
@MapsId("skill_id")
@JoinColumn(name = "skill_id")
private Skill skill;
@ManyToOne
@MapsId("employee_id")
@JoinColumn(name = "employee_id")
private Employee employee;
private int level;
public EmployeeSkill() {
}
插入功能
@Embeddable
public class EmployeeSkillKey implements Serializable {
@Column(name = "employee_id")
private int employeeId;
@Column(name = "skill_id")
private int skillId;
public EmployeeSkillKey() {
}
控制器调用函数
/**
* @param instance -> Instance of a entity
*/
public void insert(T instance) throws Exception {
try {
emFactory = Persistence.createEntityManagerFactory(UNITNAME);
entityManager = emFactory.createEntityManager();
entityManager.getTransaction().begin();
entityManager.persist(instance);
entityManager.flush();
entityManager.getTransaction().commit();
entityManager.close();
emFactory.close();
} catch (Exception e) {
e.printStackTrace();
throw new Exception(e);
}
}
有人知道解决方案吗？