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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-997) ClassCastException when executing queries with aggregates in app servers
Date Thu, 16 Feb 2006 23:42:24 GMT
ClassCastException when executing queries with aggregates in app servers
------------------------------------------------------------------------

         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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