Bug #20650 NPE in Statement.cancel()

Submitted:	23 Jun 2006 8:23	Modified:	4 Dec 2006 13:56
Reporter:	Emmanuel Cecchet	Email Updates:
Status:	Closed	Impact on me:	None
Category:	Connector / J	Severity:	S2 (Serious)
Version:	5.0.0beta	OS:	Any (all)
Assigned to:		CPU Architecture:	Any

Description:
If the connection to the server has been lost and the application tries to perform a cleanup of all pending requests, it will try to call statement.cancel() but connection might already be null and therefore cause an NPE (Statement line 334).

How to repeat:
Create a statement, execute, shutdown MySQL, call cancel().

Suggested fix:
Check if connection is null before trying to get the version number.
Statement Line 334, add:
if (this.connection == null)
  return;

Hi Emmanuel and thanks for your problem report.
Verified as described by reporter with latest driver available from DL area.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/9287

A note has been added to 5.0.3 changelog.

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