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https://issues.apache.org/jira/browse/OPENJPA-2913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dario Napolitano updated OPENJPA-2913:
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Description:
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 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.
was:
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.
> TableJDBCSeq can generate 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
> Priority: Major
>
> 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 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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