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Date: Thu, 17 Nov 2005 10:11:42 +0100 (CET)
From: "Esmond Pitt (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-129) Finalizers are non-canonical
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    [ http://issues.apache.org/jira/browse/LUCENE-129?page=comments#action_12357858 ] 

Esmond Pitt commented on LUCENE-129:
------------------------------------

Apparently I haven't made myself clear. It is essential that any finalizer calls super.finalize() regardless of any exceptions it may encounter. The canonical form shown is one way of achieving this: another is finally { super.finalize(); }. The finalizers in the classes named do not conform to either pattern and hence whatever their base classes finalizers may do is not necessarily being done.

> Finalizers are non-canonical
> ----------------------------
>
>          Key: LUCENE-129
>          URL: http://issues.apache.org/jira/browse/LUCENE-129
>      Project: Lucene - Java
>         Type: Bug
>   Components: Other
>     Versions: unspecified
>  Environment: Operating System: other
> Platform: All
>     Reporter: Esmond Pitt
>     Assignee: Lucene Developers
>     Priority: Minor

>
> The canonical form of a Java finalizer is:
> protected void finalize() throws Throwable()
> {
>  try
>  {
>    // ... local code to finalize this class
>  }
>  catch (Throwable t)
>  {
>  }
>  super.finalize(); // finalize base class.
> }
> The finalizers in IndexReader, IndexWriter, and FSDirectory don't conform. This
> is probably minor or null in effect, but the principle is important.
> As a matter of fact FSDirectory.finaliz() is entirely redundant and could be
> removed, as it doesn't do anything that RandomAccessFile.finalize would do
> automatically.

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