[jboss-jira] [JBoss JIRA] (JBRULES-3651) ClassPathResource.getLastModified() leaks a file descriptor

[Chris Rankin (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Rankin updated JBRULES-3651:
----------------------------------

    Steps to Reproduce: 
{code}URL jarURL = new URL("jar:file:/path/to/myjar.jar!/foo.txt");
JarURLConnection connection = (JarURLConnection) jarURL.openConnection();
try {
    long lastModified = connection.getLastModified();
} finally {
    connection.getInputStream().close();
}
Thread.sleep(300000);{code}

Now check the file descriptors in {{/proc/<java PID>/fd}} (Linux) to see that there is still one open for the JAR.

Not that {{ClassPathResource.getLastModified()}} makes any attempt to close this file descriptor in the first place.

  was:
{code}URL jarURL = new URL("jar:file:/path/to/myjar.jar!/foo.txt");
JarURLConnection connection = (JarURLConnection) jarURL.openConnection();
try {
    long lastModified = connection.getLastModified();
} finally {
    connection.getInputStream().close();
}
Thread.sleep(300000);{code}

Now check the file descriptors in /proc/<java PID>/fd to see that there is still one open for the JAR.

Not that {{ClassPathResource.getLastModified()}} makes any attempt to close this file descriptor in the first place.


    
> ClassPathResource.getLastModified() leaks a file descriptor
> -----------------------------------------------------------
>
>                 Key: JBRULES-3651
>                 URL: https://issues.jboss.org/browse/JBRULES-3651
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.4.0.Final, 5.5.0.Beta1
>         Environment: Fedora 17, JDK6
>            Reporter: Chris Rankin
>            Assignee: Mark Proctor
>
> Calling {{getLastModified()}} on a {{ClassPathResource}} allocates a file descriptor and doesn't release it until the {{ClassPathResource}} object is garbage-collected.
> I believe that this is a bug in {{JarURLConnection}} in Sun's JDK6, as noticed by the Freemarker project, who also created a [fix|http://sourceforge.net/tracker/index.php?func=detail&aid=1824122&group_id=794&atid=100794].

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