Re: NPE from InternalTriggerExecutionContext.cleanup()

[Tim Dudgeon]

Thanks for the response.
So its seems I'm probably right that my trigger is the ultimate cause.
Any ideas on how to work out what is failing here as the real culprit 
seem to being masked.

Tim

On 29/08/2014 18:20, Rick Hillegas wrote:
On 8/29/14 8:17 AM, Tim Dudgeon wrote:
Using Derby 10.10.1.1 I'm seeing strange behaviour when doing a series
of inserts that have triggers associated.
About 2000 rows get inserted fine, then it blows up completely.
The derby.log file contains stuff like this:

Database Class Loader started -
derby.database.classpath='APP.ExtraFunctions'
Loaded chemaxon.misc.derby.functions.MiniregFunctions from database
jar "APP"."EXTRAFUNCTIONS"
Fri Aug 29 15:37:56 BST 2014 Thread[Default RequestProcessor,1,system]
(XID = 448992), (SESSIONID = 1), (DATABASE =
C:\Users\timbo\Documents\IJCProjects\mini-regs\Vanilla
Oracle/.config/derby-minireg-11-jun/db), (DRDAID = null), Cleanup
action starting
Fri Aug 29 15:37:56 BST 2014 Thread[Default RequestProcessor,1,system]
(XID = 448992), (SESSIONID = 1), (DATABASE = C:\Users\ ... ), (DRDAID
= null), Failed Statement is: INSERT INTO APP.COMPOUNDS ( ... ) VALUES
(?,?,?,?,?,?,?,CURRENT_TIMESTAMP,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
with 31 parameters begin parameter #1: BLOB:Length=1658 :end ...
java.lang.NullPointerException
    at
org.apache.derby.impl.sql.execute.InternalTriggerExecutionContext.cleanup(Unknown
Source)
    at
org.apache.derby.impl.sql.execute.TriggerEventActivator.cleanup(Unknown Source)

    at
org.apache.derby.impl.sql.execute.InsertResultSet.cleanUp(Unknown Source)
    at
org.apache.derby.impl.sql.conn.GenericStatementContext.cleanupOnError(Unknown
Source)
    at
org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown
Source)
    at
org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
Source)
    at
org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
Source)
    at
org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown
Source)
    at
org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeLargeUpdate(Unknown
Source)
    at
org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeUpdate(Unknown Source)

...

(somethings cut out for brevity)


The trigger involved uses a custom java function that's been added to
the DB, so the real problem might well be there, but the stack trace
doesn't give much of a pointer.

Any suggestions for where to look?

Tim



Hi Tim,

This looks like a weakness in GenericStatementContext.cleanupOnError().
The header comment for that method indicates that some more work needs
to be done to protect the method when it trips across subsequent errors
during statement cleanup. I have filed
https://issues.apache.org/jira/browse/DERBY-6722 to track this defect.

If I were tracking this down, I would instrument that method to make it
print out the initial error before it calls topResultSet.cleanUp().

Thanks for bringing this weakness to our attention...
-Rick