ClassCastException when executing queries with aggregates in app servers
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Key: DERBY-997
URL: http://issues.apache.org/jira/browse/DERBY-997
Project: Derby
Type: Bug
Components: SQL
Reporter: Daniel John Debrunner
Classes that implement the aggregates such as MAX/MIN are loaded as
user-defined classes due to old support for user-defined aggregates.
If the class loader setup running Derby is not well set up these classes are
loaded in a different class loader space to Derby's class leading to
non-comparable classes due to the the same class (dependend or subper-class,
not sure which) being loaded twice.
While this may be a user setup bug, it has occured frequently leading to wasted
time resolving the issue, it would be better if Derby ensured its classes were
loaded consistently.
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