Java Hibernate Tutorial Part 13 - Compound Primary Key

Easy to follow step by step tutorial on Java Hibernate Framework using JPA annotations.
Compound Primary Key.

[srvasamsetti]

Hi Patrick,
First let me congratulate for the gr8 job.

I have gone thu all the posts, u made hibernate simple, it helped me a lot.
please keep ever tutorial made.

Thanks

[toshitsharma]

Thanks quick and fast content to learn.

[vijsen]

HI Patrick, You have done a great job. Thank u for ur videos. its very useful for me.. keep posting .. waiting for more videos

[martha]

Thanks for presentation. It was very informative. Very good for beginners.

[symeraht]

You are doing the right thing to the world!

[konstantinastamopoulou]

Just incredible, such a tutorial for free! Thank U!

[vikassmart]

@patrickwashingtondc Thanks Patrick, now it is working fine.
You have Really done excellent job by posted these tutorials.
I have completed all videos(till 17), and waiting for more videos.
Expecting soon you will post those videos as well .

[sivanadiminti]

Thanks for the post. Have gone through all your videos. They are great.. Have a question on this video.. You have used @Embeddable, but not @Embedded annotation. Is this optional? I see you have used both in your previous examples

[HaveABeautifulLife]

Hi Patrick -- thanks so much for providing these excellent tutorials.

Question: I followed this tutorial (13) exactly -- added the Entity, Id, and Embeddable annotations on appropriate classes. When I run I get a "null id generated for: class error. Am running all examples with MySql 5.1 in case that makes a difference, Hibernate 3.4. I created the Accounts class and added the CompoundKey to each one like you did -- i.e. the code matches. So ? -- thanks

[HaveABeautifulLife]

Hi Patrick -- thanks so much for providing these excellent tutorials.

Question: I followed this tutorial (13) exactly -- added the Entity, Id, and Embeddable annotations on appropriate classes. When I run I get a "null id generated for: class error. Am running all examples with MySql 5.1 in case that makes a difference, Hibernate 3.4.

[ksk]

Thanks for these tutorials, very helpful!

I have a question about creating a Compound Key: In your example, you had a userId and an accountId; Is it possible to have the accountId generated by the DB while we supply the userId? How can we go about doing this with Hibernate?

Thanks a ton!

-K

[jackziaz]

Hello Patrick, I did everything EXACTLY as explained but the program executes with a runtime IdentifierGenerationException provoked by the second invocation of the save method() I repeat...THE SECOND INVOCATION OF THE SAVE METHOD...That is save(checking); the stack trace says null id generated for: class Accounts, take NOTE that the first invocation of the save method, save(savings) works without problems...can you please help with some ideas? regards Ikpefua

[ramakrishnamogilipuri]

How to composite object using session. Is any menthods are there to get object having composite primary key. Hope Reply

[sivanadiminti]

@patrickwashingtondc Thanks for the response. Can I use @Embedded annotation for getCompoundKey() method, I see CompoundKey is embedded in Accounts class.

[vikassmart]

HI Patrick,
Thanks so much for provided these helpful hibernate tutorials.
In video 13 I have follow the same way as suggested in tutorials. I am using same exactly same videos software(DB, eclipse and hibernate). While running this code I am getting below error.
Exception in thread "main" Unknown entity:
at
please help me.

[SwapnilGangrade]

Hi patrick ..i am geeting error:- " ids for this class must be manually assigned before calling save()" I have done everything you showed in the video . Can you please help.

Swapnil

[martha]

Hi, I would appreciate if you can teach about differenct cardinality with examples. Thanks

[HaveABeautifulLife]

@patrickwashingtondc - Patrick, it is added. Still produces this error, however.

[MrRobRizzle]

@Id may work, but the better approach would be to use the @EmbeddedId annotation.