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From "Guido Spadotto (JIRA)" <j...@apache.org>
Subject [jira] Updated: (FELIX-1251) Looping NullPointerException if the polled directory is removed after File Install registration
Date Thu, 18 Jun 2009 10:43:07 GMT

     [ https://issues.apache.org/jira/browse/FELIX-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Guido Spadotto updated FELIX-1251:
----------------------------------

    Description: 
If the directory being polled by File Install is removed while File Install is running, 
the method DirectoryWatcher.traverse will raise a NullPointerException
when evaluating the condition for its "for" loop (the "list" variable  will be null).



  was:
If the directory being polled by File Install is removed while File Install is running, 
the method DirectoryWatcher.traverse will raise a NullPointerException
when evaluating the condition for its "for" loop (the "list" variable  will be null).

This is a possible workaround:

void traverse(Map/* <String, Jar> */ jars, Set configs, File jardir)
    {
        String list[] = jardir.list();
        if (list==null){
            ConcurrentModificationException cme = new ConcurrentModificationException("Unable
to list "
                    +this.watchedDirectory+ " contents. Has it been removed after " +
                    "File Install started?");
            throw cme;
        }
        for (int i = 0; (list!=null) && i < list.length; i++)
        {
        ...

This will not stop the outer loop from logging the Exception though, 
which might not be convenient for the end user.




> Looping NullPointerException if the polled directory is removed after File Install registration
> -----------------------------------------------------------------------------------------------
>
>                 Key: FELIX-1251
>                 URL: https://issues.apache.org/jira/browse/FELIX-1251
>             Project: Felix
>          Issue Type: Bug
>          Components: File Install
>    Affects Versions:  fileinstall-1.0.0
>         Environment: Windows Vista
>            Reporter: Guido Spadotto
>            Priority: Minor
>
> If the directory being polled by File Install is removed while File Install is running,

> the method DirectoryWatcher.traverse will raise a NullPointerException
> when evaluating the condition for its "for" loop (the "list" variable  will be null).

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