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Entity manager: Hibernate generating wrong SQL (composite key of composite keys)

 
Karsten Wutzke
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Posts: 106
Hibernate MySQL Database Python
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Hello,

I'm using a table that has four columns as primary key, with pairs of two columns each referencing another table via composite FK (MySQL 5.1). Both references are identifying relationships, that is they are PK as well as FK in the PlayerStats table. The design can be viewed here:
http://www.kawoolutions.com/media/hibernate-wrong-sql-playerstats.jpg

Here's the stack trace (root cause):



The generated SQL is:


As you can see from the generated SQL, the first two columns in the SELECT are the names of the two composite primary key classes: "playerstat0_.score" and "playerstat0_.teamMember". They're also used in the WHERE clause for whatever reason. The code is obviously wrong. Can't say whether there's something wrong in my code or Hibernate.

Here's the Java code for the PlayerStat and PlayerStatId classes:



Note that I omitted the imports and the equals and hashCode methods. Note also this is supposed to be JPA 1.0 code. However I believe that doesn't matter much in terms of code generation.

In the servlet I simply call:


Can anyone tell what might go wrong?

Karsten
 
It is sorta covered in the JavaRanch Style Guide.
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