Hey, I'm pretty new to hibernate and just been playing around with it, I've had this working by just using
the concrete StudentDetails class but then I tried to get it to work by creating an Interface class have having
my concrete StudentDetails implement the StudentInterface class. I can't seem to get it to work now, I think it has something to do with the way I'm using descriminator, subclass and a many-to-one or one-to-one relationship I'm missing, sorry not sure abt this stuff. I manually created a new column in the "student" table called tableDescriminator, but this is not a property of any of my classes. I thought hibernate will use the classname.
Student tableID
student_name
student_address
email
tableDescriminator
contact.hbm.xmlCode:
<class name="Tute2G.Tute2A.StudentInterface" table="student">
<id name="id" type="int" column="id" >
<generator class="increment"/>
</id>
<discriminator>
<column name="tableDescriminator"/>
</discriminator>
<property name="studentName">
<column name="student_name" />
</property>
<property name="studentAddress">
<column name="student_address" />
</property>
<property name="email">
<column name="email" />
</property>
<subclass name="Tute2G.Tute2A.StudentInterface"/>
Code:
package Tute2G.Tute2A;
public interface StudentInterface {
public String getStudentName();
public void setStudentName(String studentName);
public String getStudentAddress();
public void setStudentAddress(String studentAddress);
public String getEmail();
public void setEmail(String email);
public int getId();
public void setId(int id);
}
My concrete Student classCode:
package Tute2G.Tute2A;
public class Studentdetail implements StudentInterface{
private String studentName;
private String studentAddress;
private String email;
private int id;
public String getStudentName(){
return studentName;
}
public void setStudentName(String studentName){
this.studentName = studentName;
}
public String getStudentAddress(){
return studentAddress;
}
public void setStudentAddress(String studentAddress){
this.studentAddress = studentAddress;
}
public String getEmail(){
return email;
}
public void setEmail(String email){
this.email = email;
}
public int getId(){
return id;
}
public void setId(int id){
this.id = id;
}
}
Error LogException in thread "main" org.hibernate.InvalidMappingException: Could not parse mapping document from resource contact.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:575)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1593)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1561)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1540)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1514)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
at Tute2G.Tute2A.StudentCriteriaQueryTest.main(StudentCriteriaQueryTest.java:18)
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping Tute2G.Tute2A.StudentInterface
at org.hibernate.cfg.Mappings.addClass(Mappings.java:118)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:145)
at org.hibernate.cfg.Configuration.add(Configuration.java:675)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:510)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:572)
Thanks heaps
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