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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-557) Client driver gets OutOfMemoryError when re-executing statement without closing ResultSet
Date Thu, 06 Oct 2005 06:33:49 GMT
    [ http://issues.apache.org/jira/browse/DERBY-557?page=comments#action_12331467 ] 

Knut Anders Hatlen commented on DERBY-557:
------------------------------------------

Kathey, I think you should just go ahead and port the fix to 10.1.

Merge command:

  svn merge -r 289538:289539 https://svn.apache.org/repos/asf/db/derby/code/trunk

I have started working on a general check-that-resources-are-freed
test for DERBY-23, DERBY-210 and DERBY-557, but while doing that I ran
into another resource leak (DERBY-594) that I wanted to resolve first.

> Client driver gets OutOfMemoryError when re-executing statement without closing ResultSet
> -----------------------------------------------------------------------------------------
>
>          Key: DERBY-557
>          URL: http://issues.apache.org/jira/browse/DERBY-557
>      Project: Derby
>         Type: Bug
>   Components: Network Client
>     Versions: 10.1.1.0, 10.1.2.0, 10.2.0.0
>     Reporter: Knut Anders Hatlen
>     Assignee: Knut Anders Hatlen
>     Priority: Minor
>      Fix For: 10.1.2.0, 10.2.0.0
>  Attachments: DERBY-557.diff, DERBY-557.stat, derbyall_report.txt
>
> When re-executing a statement without closing the old ResultSet, some of the old ResultSet's
resources are not released, and the network client will eventually get an OutOfMemoryError.
> Example:
> 	Connection c = DriverManager.getConnection("jdbc:derby://localhost/mydb");
> 	PreparedStatement ps = c.prepareStatement("select * from sys.systables");
> 	while (true) {
> 		ResultSet rs = ps.executeQuery();
> 	}
> This code will run for some time and then throw an OutOfMemoryError. Same thing happens
with Statement instead of PreparedStatement. If rs.close() is added in the loop, the code
works. Explicitly closing the ResultSet should not be necessary according to this quote from
the JDBC 3.0 spec:
>   For Select statements, the statement is complete when the associated result set is
closed. The result set is closed as soon as one of the following occurs:
>      - all of the rows have been retrieved
>      - the associated Statement object is re-executed
>      - another Statement object is executed on the same connection

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