[jira] [Created] (OPENJPA-2913) TableJDBCSeq can genarate duplicate IDs if allocate() is called

["Dario Napolitano (Jira)" <ji...@apache.org>]

Dario Napolitano created OPENJPA-2913:
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             Summary: TableJDBCSeq can genarate duplicate IDs if allocate() is called
                 Key: OPENJPA-2913
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2913
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 3.1.2
            Reporter: Dario Napolitano


When using the allocate() method of the ID generator of an entity using table based generation (TableJDBCSeq), the generator will start from 1 no matter what is the current value of the sequence, if it's the first allocation. If a new allocation takes place, the generator is likely to use values already allocated to other entities.

Example:

OpenJPAEntityManager oem = (OpenJPAEntityManager) em;
Generator idGenerator = oem.getIdGenerator(User.class);
idGenerator.allocate(1000);

 

This is because the TableJDBCSeq does not update the current sequence value during allocate() calls, but only during next() calls. However, the allocate() method is exposed via the Generator interface to request preallocation for efficiency.



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