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From "Konstantin Kasatkin (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (VFS-399) Custom VFSes over ZIP crashes with Null pointer Exception
Date Tue, 17 Jan 2012 07:50:39 GMT

     [ https://issues.apache.org/jira/browse/VFS-399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Kasatkin updated VFS-399:
------------------------------------

    Attachment: test.zip

I've attached complete example based on org.apache.commons.vfs2.example.ShowProperties class.
There are two run scripts: first - with original 2.0 VFS, second - with patched zip provider.
                
> Custom VFSes over ZIP crashes with Null pointer Exception
> ---------------------------------------------------------
>
>                 Key: VFS-399
>                 URL: https://issues.apache.org/jira/browse/VFS-399
>             Project: Commons VFS
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: Windows XP x64
> Oracle JDK 1.6.0.27
>            Reporter: Konstantin Kasatkin
>            Priority: Blocker
>         Attachments: test.zip
>
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> When I implement any intermediate VFS provider and try to connect it to ZIP VFS provider
like jar:myprovider:///myurl/myclasses.jar I get Null Pointer Exception due to wrong implementation
of ZIP provider. Because it initializes NULL zip entry and tries to get last modification
time of this entry without checking for null value.
> I suggest the solution for this issue in two steps.
> 1. For elimination of issue in class org.apache.commons.vfs2.provider.zip.ZipFileObject.java
in method doGetLastModifiedTime() {color:red}line 149{color} 
> change code: [{color:red} return entry.getTime();{color}]
> to code [{color:red}return entry==null ? 0 : entry.getTime();{color}]
> 2. For correct passing of last modification tate from parent VFS to ZIP VFS in class
org.apache.commons.vfs2.provider.zip.ZipFileSystem.java method init() {color:red}line 115{color}
> change code [{color:red}parent = createZipFileObject(parentName, null);{color}]
> to code [{color:red}
> ZipEntry parentEntry = new ZipEntry(getParentLayer().getFileSystem().getRoot().getName().getPath());
> parentEntry.setSize(0);
> try {
>      parentEntry.setTime(getParentLayer().getFileSystem().getRoot().getContent().getLastModifiedTime());
> } catch (Exception e) { }
> parent = createZipFileObject(parentName, entry);{color}
> ]

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