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From Gregg Wonderly <ge...@cox.net>
Subject Re: OSGi RFC 119 Distributed OSGi - (Was [RE: OSGi and Jini])
Date Thu, 16 Jul 2009 19:59:17 GMT
Sam, I am at a loss for words...

It's clear that I am not able to ask for help in understanding the benefits that 
you see, or perhaps you can't relate them to me.  I'm just looking for your 
experiences and the values you see.  I know what OSGi says it is.  I know how to 
read the documentation (again and again) to see what it currently supports in 
each new release.

That's not what I am looking for.  I'm trying to get first hand reports and 
recommendations on what is valuable to those who have used it and deployed 
things using it.  I want to see which of the possible set of features that Jini 
could provide for OSGi inter-working would allow someone to get some benefits.

For example, preferred class loading solves some class loading issues.  But, if 
some parts of OSGi have removed those benefits from your view and you don't need 
them any longer, I'd like to know more about that.

Do you just like OSGi because it's a container that you drop things into and 
they work?

I want to know the details of your experiences please.

Gregg Wonderly

Sam Chance wrote:
> Gregg,
> It is not my desire or intention to try to play "technology ping-pong."  I'm
> only introducing another viewpoint.  Frankly, I don't have time to read
> long, verbose emails.  I've touted enough OSGi technology attributes to
> intrigue those who might be interested in learning more.  The answers to
> your questions can be found on the OSGi Alliance's web site - and I promise
> you there are solid answers.  Additionally, a number of books that provide
> ample OSGi coverage are either recently published or nearing publication.
> Oracle, Sun, IBM, SpringSource, JBoss, Progress, Paremus, ProSyst and others
> offer a lot of informative OSGi literature as well. Neal Bartlett also
> provides a lot of OSGi resources.  Eclipse [Equinox] and Apache Felix are
> great places as well.
> Happy Learning! :-)
> Sam
> On Tue, Jul 14, 2009 at 6:49 PM, Gregg Wonderly <gregg@wonderly.org> wrote:
>> Sam Chance wrote:
>>> In fact, OSGi does help a lot with "Classpath Hell".
>> I didn't see a reply from my earlier request for more information on the
>> issues that the OSGi experienced think OSGi helps the most with regarding
>> this issue. I'd really like to see what issues you all have had and that
>> OSGi has addressed.
>> Is it just that packaging encloses the set of things you need to make
>> things work and you don't have to worry about that, or is it something else?
>>  Many containers use ClassLoader hierarchies of various shapes to isolate
>> and "interrelate" different types of package structures.  I'm just
>> interested in knowing more about the issues and benefits you all recognize
>> from your experiences.
>>> OSGi also adds another layer of security above the standard Java.
>> What do you feel is important about this?  Authentication vs Authorization
>> issues would be great to have your opinions and experience on.
>>> Versioning is a "first-class function" in OSGi.
>> This is a big deal for separating old and new.  I think we have a good bit
>> of this in the PreferredClass mechanisms in Jini 2.x so that implementations
>> can be  forced into use for bug fixing and interfacing with different
>> versions of difference services.  Is there anything else beside classloader
>> based separation that you all find important in what OSGi provides?
>> Gregg Wonderly

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