createObject('java') / Javaloaders

[Todd Rafferty]

If you are all too familiar with Mark Mandel's Javaloader or createObject('java'), you may want to read this blog post:
http://www.railo.ch/blog/index.cfm/2010/1/15/Railo-Tip-CreateObjectjava

--
~Todd Rafferty ** Volunteer Railo Open Source Community Manager ** http://getrailo.org/

[denstar]

Is compiling of java files and spring support hidden inside already too?

Mad props to Mandel and his Javaloader. Excellent work.

Sweet little tidbit there, Todd, thanks.

--
I am called a dog because I fawn on those who give me anything, I yelp
at those who refuse, and I set my teeth in rascals.
Diogenes

[James Holmes]

Does the railo implementation memory leak like an ACF classloader does?

mxAjax / CFAjax docs and other useful articles:
http://www.bifrost.com.au/blog/

2010/1/16 Todd Rafferty <to...@getrailo.org>:

[Gert Franz]

Well we haven't replicated that bug, but you could add it to Uservoice :-)

Greetings from Switzerland
Gert Franz

Railo Technologies       Professional Open Source
skype: gert.franz            ge...@getrailo.com
+41 76 5680 231              www.getrailo.com

-----Ursprüngliche Nachricht-----
Von: ra...@googlegroups.com [mailto:ra...@googlegroups.com] Im Auftrag von
James Holmes
Gesendet: Samstag, 16. Januar 2010 09:51
An: ra...@googlegroups.com
Betreff: Re: [railo] createObject('java') / Javaloaders

[Michael Offner-Streit]

Railo use a regular URLClassLoader for this.

/micha

James Holmes schrieb:

-- 
Michael Offner-Streit
CTO
Railo Technologies GmbH
michael...@railo.ch
www.getrailo.com

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[Tom Chiverton]

2010/1/18 Michael Offner-Streit <michael...@railo.ch>:

> Railo use a regular URLClassLoader for this.

So can I load multiple (conflicting) .jar versions or not ?

--
Tom

[Michael Offner-Streit]

not so easy to answer.
classloaders in java are organized hierarchical, in other words every classloader first ask for the parent classoader for a class, when that class already exists in the parent classloader, the classloader return this class and does not overwrite that class.
in other word, you can not overwrite a class from parent classloader.

what you can do, you can load different versions of the same jar on the same level
example:
// this loads different version of the same class
obj1=createObject('java',...,'...my-1-0-0.jar')
obj2=createObject('java',...,'...my-1-0-1.jar')

we have think about for a long time to manage all jars used by railo inside railo, this bring different benefits:
- we can update jars whitin a patch release
- we can load jars only when needed.
- we have no conflicts with jars loaded in the servlet engine

/micha



Tom Chiverton schrieb:

-- 
Michael Offner-Streit
CTO
Railo Technologies GmbH

[Adam Haskell]

So because i am too lazy too look, what is the parent classloader for createObject? Why not allow that to be configured (Javaloader does this btw) so if I don;t want anything except for what I am configuring then I set the parent to null.

Adam

[Michael Offner-Streit]

if you set parent classloader to null, the SystemClassloader is invoked

/micha

Adam Haskell schrieb:

>> 2010/1/18 Michael Offner-Streit <michael...@railo.ch> <mailto:michael...@railo.ch>:

>>
>>> Railo use a regular URLClassLoader for this.
>>>
>> So can I load multiple (conflicting) .jar versions or not ?
>>
>>
>
>
> --
> Michael Offner-Streit
> CTO
> Railo Technologies GmbH

> michael...@railo.ch <mailto:michael...@railo.ch>
> www.getrailo.com <http://www.getrailo.com> Mailing List (english):