Hello, Kathey:
thank you for prompt response.
I was running 10.6. Upgraded to 10.7 and encountered the same NPE.
Downgraded to 10.3 and 10.2 but got a different error
Caused by: java.sql.SQLException: No suitable driver found for
jdbc:derby:memory:testdb;create=true
What could be a problem there?
From:
Kathey Marsden <[email protected]>
To:
Derby Discussion <[email protected]>
Cc:
Pavel Bortnovskiy <[email protected]>
Date:
02/09/2011 12:45 PM
Subject:
Re: NullPointerException deep in Derby
On 2/9/2011 7:49 AM, Pavel Bortnovskiy wrote:
Additional information:
the message "executing statement after shutdown" is misleading. There was
no shutdown occurring and the connection was open and valid.
Our query (which I cannot show here for now) was complex, with case
statements and group by.
Interestingly, as soon as the query was reworked to remove group by
clause, the code worked flawlessly.
P.
Hi Pavel,
Since your problem is in generated code it is hard to figure out what went
wrong without more information.
Firstly, I was wondering what version of Derby you are using? I would
suggest moving to the latest release, 10.7 if you are not already there
to see if the problem still exists.
If it does, run your query with:
derby.debug.true=DumpClassFile and it will dump the generated class file
which you can decompile and perhaps get a clue where the problem lies. I
don't think that Derby should ever throw this NPE, so I would say at least
file a Jira bug with the information that you can share and the stack
trace.
As a further diagnostic step, there was a major rework and clean up of
group by in 10.3, DERBY-681 which resulted in some regressions. Usually
when I see a group by issue, I will first try the build before and after
that change to see if it might be related. If you don't want to build
Derby, as a first step it would be interesting to see if occurs with 10.3.
but not 10.2 to see if DERBY-681 is suspect.
Thanks
Kathey
From:
Pavel Bortnovskiy <[email protected]>
To:
Derby Discussion <[email protected]>
Date:
02/09/2011 10:43 AM
Subject:
NullPointerException deep in Derby
Hello:
I just got the following NullPointerException, seemingly inside Derby
code:
2011-02-09 10:39:13,576 ERROR DataProcessor - SQL Exception due to
executing statement after shutdown
java.sql.SQLException: The exception 'java.lang.NullPointerException' was
thrown while evaluating an expression.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown
Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown
Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(UnknownSource)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(UnknownSource)
at
org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at
org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(UnknownSource)
at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
at
com.jefco.processors.DataProcessor.process(DataProcessor.java:189)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.sql.SQLException: The exception
'java.lang.NullPointerException' was thrown while evaluating an
expression.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(UnknownSource)
... 13 more
Caused by: java.sql.SQLException: Java exception: ':
java.lang.NullPointerException'.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(UnknownSource)
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown
Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown
Source)
at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(UnknownSource)
... 10 more
Caused by: java.lang.NullPointerException
at
org.apache.derby.exe.ac96c5c136x012ex0b13x5d52xffff9ccc25960.e9(Unknown
Source)
at org.apache.derby.impl.services.reflect.DirectCall.invoke(Unknown
Source)
at
org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.doProjection(UnknownSource)
at
org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(UnknownSource)
at
org.apache.derby.impl.sql.execute.ScrollInsensitiveResultSet.getNextRowFromSource(UnknownSource)
at
org.apache.derby.impl.sql.execute.ScrollInsensitiveResultSet.getNextRowCore(UnknownSource)
at
org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(UnknownSource)
... 5 more
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this email, including any attachments, are confidential to the ordinary user of
the email address to which it was addressed. If you are not the addressee of
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