Thanks, Peter and Roger. In addition to the classes listed by Lance, a
complete list of the affected finalizers can be found in this JIRA
comment:
https://issues.apache.org/jira/browse/DERBY-6856?focusedCommentId=15990011&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15990011
Thanks,
-Rick
On 5/4/17 9:48 AM, Lance Andersen wrote:
On May 4, 2017, at 11:32 AM, Mandy Chung <mandy.ch...@oracle.com> wrote:
On May 3, 2017, at 11:16 PM, Peter Levart <peter.lev...@gmail.com> wrote:
Hi Rick,
Allow me to join the discussion...
On 05/04/2017 04:21 AM, Rick Hillegas wrote:
Thanks, Roger. That is a helpful example.
Derby is a component which can be quiesced and unloaded on resource-constrained
platforms, then re-loaded when resources free up. Unloading means garbage
collecting all the classloaders created by the component so that, at the end,
not a single scrap of Derby code remains loaded. Has the Cleaner pattern been
tested under these kinds of conditions? Can you point me at a Cleaner-based
library which successfully unloads and reloads itself without leaking
classloaders?
Can you point me to a place in Derby code where you are currently using
finalize() method for your purpose and I'll try to show you how to convert this
to Cleaner API...
I'm surprised that you actually need finalize() in Derby. Isn't this pure Java
code? Usually finalize() is needed in situations where there's some non-Java
resource which has to be cleaned-up when all the references to some Java object
that represents it are gone. I'm curious what you need to clean in a pure Java
library.
Please include me for the pointer to Derby code too. This can be used serving
as examples to migrate away from use of finalizers. We also hope to do that in
JDK to set up more examples.
Here are a few examples I believe:
http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/am/ClientConnection.java
<http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/am/ClientConnection.java>
http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/ClientPooledConnection.java
<http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/ClientPooledConnection.java>
http://svn.apache.org/repos/asf/db/derby/code/trunk/java/engine/org/apache/derby/impl/jdbc/EmbedPreparedStatement.java
<http://svn.apache.org/repos/asf/db/derby/code/trunk/java/engine/org/apache/derby/impl/jdbc/EmbedPreparedStatement.java>
Mandy
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<http://oracle.com/us/design/oracle-email-sig-198324.gif>Lance Andersen|
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Oracle Java Engineering
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lance.ander...@oracle.com <mailto:lance.ander...@oracle.com>
