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https://issues.apache.org/jira/browse/SOLR-914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743562#action_12743562
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Hoss Man commented on SOLR-914:
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I don't understand objections to the idea that finalize should close if (and
only it) the resource hasn't already been closed ... people shouldn't relying
on it, but having code that aids in the prevention of resource leaks doesn't
seem like abad thing to me.
the only things i would change about this patch...
* make the logging done by the finalizer methods more serious (error or
maybe even fatal) and make them convey *why* it's an error ("...was not closed
prior to finalizing")
* SolrIndexWriter.finalize() still calls super.close() (only this.close()
should ever call super.close())
> Presence of finalize() in the codebase
> ---------------------------------------
>
> Key: SOLR-914
> URL: https://issues.apache.org/jira/browse/SOLR-914
> Project: Solr
> Issue Type: Improvement
> Components: clients - java
> Affects Versions: 1.3
> Environment: Tomcat 6, JRE 6
> Reporter: Kay Kay
> Priority: Minor
> Fix For: 1.4
>
> Attachments: SOLR-914.patch
>
> Original Estimate: 480h
> Remaining Estimate: 480h
>
> There seems to be a number of classes - that implement finalize() method.
> Given that it is perfectly ok for a Java VM to not to call it - may be -
> there has to some other way { try .. finally - when they are created to
> destroy them } to destroy them and the presence of finalize() method , (
> depending on implementation ) might not serve what we want and in some cases
> can end up delaying the gc process, depending on the algorithms.
> $ find . -name *.java | xargs grep finalize
> ./contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/JdbcDataSource.java:
> protected void finalize() {
> ./src/java/org/apache/solr/update/SolrIndexWriter.java: protected void
> finalize() {
> ./src/java/org/apache/solr/core/CoreContainer.java: protected void
> finalize() {
> ./src/java/org/apache/solr/core/SolrCore.java: protected void finalize() {
> ./src/common/org/apache/solr/common/util/ConcurrentLRUCache.java: protected
> void finalize() throws Throwable {
> May be we need to revisit these occurences from a design perspective to see
> if they are necessary / if there is an alternate way of managing guaranteed
> destruction of resources.
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