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From "John H. Embretsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2480) DriverManager.getConnection leaks memory using EmbeddedDriver on non-existent database
Date Wed, 28 Mar 2007 08:26:32 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12484757
] 

John H. Embretsen commented on DERBY-2480:
------------------------------------------

I tried the patch, DERBY-2480-1.diff, and it seems to fix this issue. Ran the repro (with
modified database path on Solaris) against sane jars, 1M iterations with the embedded driver
(8 MB max heap; fails after less than 20k iterations without the patch) and 160k iterations
with the client driver (16 MB max heap in the server VM). I saw no signs of a memory leak.
I used JDK 6 for testing and its JConsole tool for monitoring.

> DriverManager.getConnection leaks memory using EmbeddedDriver on non-existent database
> --------------------------------------------------------------------------------------
>
>                 Key: DERBY-2480
>                 URL: https://issues.apache.org/jira/browse/DERBY-2480
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
10.3.0.0
>         Environment: Windows Vista, JDK 1.4.2_13
> Solaris 10, Sun JDK 1.4.2 & 1.5.0
>            Reporter: Jeff Clary
>            Priority: Minor
>         Attachments: DERBY-2480-1.diff, heap-server-Xmx32m.png, Patch_DERBY-1947_and_DERBY-2480.diff,
testOpenOfMissingDatabase.java
>
>
> Repeated calls to java.sql.DriverManager.getConnection("jdbc:derby:C:\\DOES_NOT_EXIST")
leak memory and eventually lead to an OutOfMemoryError.
> This bug is similar to DERBY-1947 in that ContextManager objects are not getting removed
from the HashSet.  The attached test program demonstrates the issue.  When run with VM options
-Xms8m -Xmx8m, it throws an OutOfMemoryError after 19022 calls to DriverManager.getConnection.

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