In my project I have User
, Role
, UserRole
and BloodGroup
entities. Firstly I take List<BloodGroup>
from DB and set to User
. Then I give User
and Role
entites to UserRole
. After that I insert User
to DB, then I try to insert UserRole
, but I get an error. When I look to DB, the ID of BloodGroup
isn't inserted in User
table.
If I choose the first BloodGroup
in the list, I get an error. Other options is normal.
I look at the internet, I found cascade = CascadeType.ALL
, but this add same data to BloodGroup
, which means I have more Arh+ BloodGroup
.
The entities:
@Entity
@Table(name="USERS")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long userid;
@OneToMany(mappedBy="user")
private List<Userrole> userroles;
//bi-directional many-to-one association to Bloodgroup
@ManyToOne
@JoinColumn(name="BLOODGRUPID")
private Bloodgroup bloodgroup;
}
@Entity
public class Bloodgroup implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int bloodgroupid;
private String bloodgroupname;
@OneToMany(mappedBy="bloodgroup")
private List<User> users;
}
@Entity
public class Userrole implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long userroleid;
private Timestamp createddate;
private Timestamp deleteddate;
private String isactive;
//bi-directional many-to-one association to Role
@ManyToOne
@JoinColumn(name="ROLEID")
private Role role;
//bi-directional many-to-one association to User
@ManyToOne
@JoinColumn(name="USERID")
private User user;
}
Controller:
user.setBloodgroup(bloodGroupImpl.getBloodGroupById(bGroup));
user.setUserid(userImpl.insertUserProfile(user));
userRoleImpl.insertUserRole(user,role);
DAO:
public void insertUserRole(User user, Role role) {
Session session =getHibernateTemplate().getSessionFactory().getCurrentSession();
Userrole uRole = new Userrole();
uRole.setIsactive("1");
uRole.setRole(role);
uRole.setUser(user);
session.save(uRole);
session.flush();
}
public void insertUserProfile(User user) {
Session session = getHibernateTemplate().getSessionFactory().getCurrentSession();
session.save(user);
}
Log:
Hibernate:
insert
into
IU.Userrole
(userroleid, createddate, deleteddate, isactive, ROLEID, USERID)
values
(default, ?, ?, ?, ?, ?)
05.Şub.2012 19:23:29 com.sun.faces.application.ActionListenerImpl processAction
SEVERE: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.iu.eblood.model.Bloodgroup
javax.faces.el.EvaluationException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.iu.eblood.model.Bloodgroup
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
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:775)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:103)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:310)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Best Answer
your issue will be resolved by properly defining cascading depedencies or by saving the referenced entities before saving the entity that references. Defining cascading is really tricky to get right because of all the subtle variations in how they are used.
Here is how you can define cascades:
In this scenario, every time you save, update, delete, etc Userrole, the assocaited Role and User will also be saved, updated...
Again, if your use case demands that you do not modify User or Role when updating Userrole, then simply save User or Role before modifying Userrole
Additionally, bidirectional relationships have a one-way ownership. In this case, User owns Bloodgroup. Therefore, cascades will only proceed from User -> Bloodgroup. Again, you need to save User into the database (attach it or make it non-transient) in order to associate it with Bloodgroup.