Composite Key causing error in Entity Class- AnnotationException

[Nathan Milota]

I am trying to create an application which schools can use for Prom to assign a ticket to a student and enter the ticket number in the website to grant access.  

Since a student ID can be the same at different schools, I created a composite key for the student ID and school ID in mySQL.

Here is the student class.  Getters and Setters omitted.

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name="students")
@IdClass(StudentIdentity.class)
public class Student {
	
	@EmbeddedId
	private StudentIdentity studentIdentity;
	
	
	@Column(name= "first_name")
	private String firstName;
	@Column(name="last_name")
	private String lastName;
	
	private String status;
	
	@Column(name="is_restricted")
	private boolean isRestricted;
	
	@Column(name="restricted_reason")
	private String restrictedReason;
	
	@Column(name="ticket_number")
	private String ticketNumber;

}

So, I created a student identity class to map the school ID and student ID together, but since School also has its own entity class, I'm not sure I did it right.  

@Data
@AllArgsConstructor
@NoArgsConstructor

@EqualsAndHashCode


@Embeddable
public class StudentIdentity implements Serializable{
	
	public StudentIdentity() {
		
	}
	
	private String studentId;
	
	
	@OneToOne(fetch= FetchType.EAGER)
	@JoinColumn(name="school_id", referencedColumnName="id")
	private School school;
	
	public String getStudentId() {
		return studentId;
	}
	public void setStudentId(String studentId) {
		this.studentId = studentId;
	}
	public School getSchool() {
		return school;
	}
	public void setSchool(School school) {
		this.school = school;
	}
	
	
	
	
	

}

I'm getting an error.    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Unable to find properties (studentId, school) in entity annotated with @IdClass:com.kenmilota.promticket.entity.Student

[Salil Wadnerkar]

The error is right in front of you:
```Unable to find properties (studentId, school) in entity annotated with @IdClass:com.kenmilota.promticket.entity.Student```

[Nathan Milota]

But it is there though.   It is in the StudentIdentity class.  

[Salil Wadnerkar]

`EmbeddedId` talks about what is the composite key for this record. It is not going to add properties of `StudentIdentity` as properties of `Student`

[Nathan Milota]

When I added the studentID and School, it still didn't work.

[Nathan Milota]

Nearly all the videos I've watched and websites I've looked at with examples did it this way, and it works just fine.   I don't get what I'm doing wrong.

[Nathan Milota]

I think there is a bug in the IDE or something.   I'm doing it right.

[Paul Clapham]

Start at the beginning by downloading a project from one of those tutorials you saw on line. Install it into your IDE unchanged and see what happens.

[Tamás Kertész]

If it is still relevant, try to remove @IdClass(StudentIdentity.class) annoation from your Student class.

IdClass and EmbeddedId are similar but not the same.

IF your intention is to use @EmbeddedId (as I see it is), @IdCass annotation is not needed at all and this is the one causing your error.