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From Pid <...@pidster.com>
Subject Re: Dependencies on extensions functionality
Date Sun, 05 Feb 2012 11:51:39 GMT
On 04/02/2012 16:44, Violeta Georgieva wrote:
> Hi,
> 
> The Dependencies on Extensions mechanism is described in Servlet Spec 3.0 -
> chapter 10.7.1.

It appears to be first documented in Tomcat for Servlet 2.3.

> In the web application's Manifest file one should describe the following:
> 
> Extension-List: <extension>
> <extension>-Extension-Name: <name>
> <extension>-Specification-Version: <version>
> <extension>-Implementation-Version: <version>
> <extension>-Implementation-Vendor-Id: <vendor>
> 
> in the jar file's Manifest (this is the extension), one should specify:
> 
> Extension-Name: <name>
> Specification-Version: <version>
> Implementation-Version: <version>
> Implementation-Vendor-Id: <vendor>

I'm curious, what kind of extension are you creating and what for?


p

> So from the spec we have "The container must provide a directory for these
> libraries. The files placed within this directory must be available across
> all Web applications. The location of this directory is container-specific.
> The class loader the servlet container uses for loading these library files
> must be the same for all Web applications within the same JVM. This class
> loader instance must be somewhere in the chain of parent class loaders of
> the Web application class loader."
> 
> From Tomcat sources I can see that while starting web app context
> (StandardContext.startInternal()) the extensions are checked for
> availability (ExtensionValidator.validateApplication). I can see again in
> the ExtensionValidator that "catalina.ext.dirs" also is scanned while
> scanning for container level extensions. Unfortunately I cannot find a
> place where this extensions are made available for web applications.
> 
> 
> Regards
> Violeta
> 
> 2012/2/3 Pid <pid@pidster.com>
> 
>> On 03/02/2012 13:25, Violeta Georgieva wrote:
>>> Hi,
>>>
>>> I'm using Tomcat 7.0.23 on Windows.
>>>
>>> I have a web application that specifies in the Manifest that wants to use
>>> an extension.
>>
>> How does it do that?
>>
>>> I specify "catalina.ext.dirs" to point to the directory where I placed my
>>> extensions jar files.
>>
>> How is that property processed?
>>
>>
>>> Unfortunately when I request my application I'm receiving
>>> "ClassNotFoundException".
>>>
>>> I verified that
>>>
>>> ExtensionValidator.validateApplication() succeeded to find the extension
>>> jar file.
>>>
>>> What could be the problem? May be I'm missing some configuration?
>>
>> No idea.  What are extensions?
>>
>> How is that JAR file added to the/a classloader?
>>
>>
>> p
>>
>>
>>> Thanks in advance.
>>>
>>> Regards
>>>
>>> Violeta
>>>
>>
>>
>> --
>>
>> [key:62590808]
>>
>>
> 


-- 

[key:62590808]


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