[jira] [Created] (DERBY-6932) Migrate finalization to the new Cleaner-based pattern introduced by JDK 9 build 167

["Rick Hillegas (JIRA)" <ji...@apache.org>]

Rick Hillegas created DERBY-6932:
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             Summary: Migrate finalization to the new Cleaner-based pattern introduced by JDK 9 build 167
                 Key: DERBY-6932
                 URL: https://issues.apache.org/jira/browse/DERBY-6932
             Project: Derby
          Issue Type: Improvement
          Components: JDBC, Network Client, Network Server
    Affects Versions: 10.14.0.0
            Reporter: Rick Hillegas


As of build 167, JDK 9 deprecated the finalize() method. This produces deprecation warnings when compiling several Derby classes. See https://issues.apache.org/jira/browse/DERBY-6856?focusedCommentId=15990011&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15990011 . The recommended fix is a non-trivial mini-project, viz., to migrate to a new finalization pattern based on a newly added Java 9 class, java.lang.ref.Cleaner. Peter Levart kindly mocked up the fix for one affected Derby class (ClientConnection). See http://cr.openjdk.java.net/~plevart/misc/Cleaner/derby/ClientConnection_finalize2cleaner.patch

Further discussion can be found on the following open-jdk email thread: http://mail.openjdk.java.net/pipermail/core-libs-dev/2017-May/047417.html




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