Question

I have an entity class userdetails which has the username, userid (numeric) and password fields, with username and userid forming a composite primary key. This is negotiable, and possibly unimportant to the main problem.

I have another class, connectiontable, which has userid as the primary key. The sql code used to generate the relevant tables is as follows:

create table usertable
(
userid int NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
username varchar(128) NOT NULL UNIQUE,
password varchar(128) NOT NULL, 
CONSTRAINT USER_PK PRIMARY KEY(username, userid)

);

That’s the sql code for usertable. The following is for connectiontable

create table connectiontable
(
userid int not null,
username varchar(128) not null,
connections varchar(32670) not null,

CONSTRAINT CONNECTION_PK PRIMARY KEY(username, userid),
CONSTRAINT CONNECTION_FK FOREIGN KEY(username,userid) REFERENCES usertable(username,userid) 
);

There are a bunch of other things in connectiontable, but those are irrelevant. I use netbeans 7.2.1 and Jave EE6. I use the ‘create entities from database entries’ but for some reason, I don’t have a getter and setter for either userid or username. They are in connectiontablePK, but I can’t seem to make use of that. For example, when I generate the jsf pages, I want to be able to do something like:

Connectiontable con = new Connectiontable();
con.getUsername();

But it complains because it can’t find that method in connectiontable.java.

Can anyone advise me why this is the case, and how I can solve it? Thank you.

Answer 1

… You’re not posting the Java code, which I suspect would help but:

Anytime in JPA when you have a composite primary key, you have to have an ’embedded’ primary-key class. I suspect you have a class definition similar to the following:

@Embeddable
public class UserNameId {
    private int userid;
    private String username;
}

And then usertable and connectiontable both contain the following (or similar):

@Embedded
@Id
private UserNameId userNameId;

… So you should expect a getter/setter for userNameId, but not the embedded fields, like you expect.