Clarify downcasts in queries
----------------------------
Key: JDO-679
URL: https://issues.apache.org/jira/browse/JDO-679
Project: JDO
Issue Type: Improvement
Components: specification
Affects Versions: JDO 3 maintenance release 1
Reporter: Matthew T. Adams
The specification needs clarification when it comes to downcasting within the
query filter. Currently, the JDO 3.0 specification states (14.6.2):
"Navigation through a null-valued field, which would throw
NullPointerException, is treated as if the subexpression returned false.
Similarly, a failed cast operation, which would throw ClassCastException, is
treated as if the subexpression returned false. Other subexpressions or other
values for variables might still qualify the candidate instance for inclusion
in the result set."
The clarification is that if a cast will never be successful (casting Employee
as Integer, for example), then an exception should be thrown (JDOUserException
with an inner ClassCastException?), otherwise, the cast behaves as the
specification dictates.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
