[Red5] Classloader Issues with Hibernate

Daniel Rossi electroteque at gmail.com
Tue Apr 14 20:16:12 PDT 2009 

On 15/04/2009, at 9:02 AM, Tyler Kocheran wrote:

> Oh, well here's a really simple, sweet example (built by Ivy, 18.5  
> KB!) that was my first intro to AOP. It's really simple, but AOP  
> rocks. Being able to "intercept" method calls is so rad, especially  
> for security. It's definitely something I need to learn more about.  
> Daniel, what's the purpose in using AOP with Hibernate? I'm still  
> kind of unclear as to why so many people include it in their projects.


If you have a look at the config, and the docs, it traps the get /  
set / delete methods and handles caching / transactions accordingly  
aparantly ?

>
>
> On Tue, Apr 14, 2009 at 3:49 PM, Mondain <mondain at gmail.com> wrote:
> I dont use AOP so I wasnt commenting on its use. I do believe that  
> Dominick and I are using AOP in the project where the dir list came  
> from, but I didnt configure it.. he did.
>
> Paul
>
>
> On Tue, Apr 14, 2009 at 3:45 PM, Tyler Kocheran  
> <rfkrocktk at gmail.com> wrote:
> My AOP project works great using the spring-aop library, but yeah  
> I'm not using namespaces but the old way in my markup.
>
> On Tue, Apr 14, 2009 at 1:13 PM, Daniel Rossi  
> <electroteque at gmail.com> wrote:
> SO the recommended system is to not use AOP, and use the old v 1.0  
> way for transactions ?
>
> On 15/04/2009, at 5:24 AM, Mondain wrote:
>
>> It should, but i would have to test it to find out if it actually  
>> works. I've heard that Spring does some funky stuff in their  
>> weavers...
>>
>> On Tue, Apr 14, 2009 at 10:31 AM, Tyler Kocheran  
>> <rfkrocktk at gmail.com> wrote:
>> For all Spring-related stuff, does the webapp class-loader  
>> automatically delegate to the global class loader? IE: Should I put  
>> all Spring libraries in the global lib? (Eg: Spring ORM)
>>
>> 2009/4/13 Mondain <mondain at gmail.com>
>>
>> I had a problem with the primary quartz scheduler recently because  
>> it is loaded outside of the webapp where I was trying access it.  
>> This is why changed the codebase to allow schedulers based within a  
>> webapp/red5app when required. My particular problem was that the  
>> scheduler could not load a class inside my webapp since it had no  
>> idea that my webapp classloader existed and since it was loaded by  
>> the urlclassloader it only checked itself and the appclassloader  
>> (main top level parent). This may be the problem with your client  
>> registry, if you are not creating the registry class within your  
>> webapp then it will not be able to use your webapp classes properly.
>>
>> AppClassLoader <- UrlClassLoader <- WebAppClassLoader (one of these  
>> for each of your apps)
>>
>> I know this seems very simple, but trust me when I say it is not..
>>
>> A lot of the time the problem finding classes will be that a  
>> library or instance is trying to use  
>> Thread.getCurrentContext().getClassLoader() or it will just do a  
>> Class.forName() without supplying the loader to use (so it uses  
>> AppClassLoader). If the thread is within the Red5 process it will  
>> not find your webapp classes, this has caused a lot of problems..  
>> and continues to confuse and irritate the #$!% out of me.
>>
>> Enough rambling..
>>
>> Paul
>>
>>
>> On Mon, Apr 13, 2009 at 7:42 PM, Daniel Rossi  
>> <electroteque at gmail.com> wrote:
>>
>> On 14/04/2009, at 12:02 PM, Mondain wrote:
>>
>>> How is it broken again?
>>
>> It was all working and I alerted about that and then suddenly I was  
>> getting class not found errors again. It is still working for the  
>> hibernateTest app but not my other app which does hibernate stuff  
>> inside a ClientRegistry thats where the class not found error  
>> happens. So i will have to setup tests for that aswell now.
>>
>>
>>> Look at my directory list and clearly it works fine. As for your  
>>> question TK, youve pretty much got it nailed except the last bit  
>>> where it searches the AppClassLoader which the top-most level and  
>>> if it doesnt find the class there (-cp xxxx.jar) then you get the  
>>> exception. Webapp class loaders look down first and then follow  
>>> standard class loading procedure by looking up the loader list.
>>>
>>> Paul
>>>
>>> On Mon, Apr 13, 2009 at 4:29 PM, Daniel Rossi <electroteque at gmail.com 
>>> > wrote:
>>> No the classloader was fixed, but after a recent update it  
>>> suddenly broke again, I will try and create an example app for  
>>> this, the hibernateTest works, but when trying to do hibernate  
>>> stuff inside the ClientRegistry it somehow breaks and cannot find  
>>> a class. I had to move all the jars into the common lib to get  
>>> around it.
>>>
>>> On 14/04/2009, at 5:55 AM, Mondain wrote:
>>>
>>>> Tyler,
>>>> Here is the directory dump of a project that Dominick and I are  
>>>> working on.. Both webapps use hibernate + mysql (names and some  
>>>> jars removed to protect the innocent) and work without fail.  
>>>> Hopefully this will help you with placement of your jars, also  
>>>> note that the r3509 was our base version and we are currently  
>>>> running trunk.
>>>>
>>>> http://pastebin.com/m69b741c3
>>>>
>>>> Paul
>>>>
>>>> On Mon, Apr 13, 2009 at 11:46 AM, Tyler Kocheran <rfkrocktk at gmail.com 
>>>> > wrote:
>>>> I'm trying to set up a pretty simple Hibernate project for use  
>>>> with Red5, using the latest trunk. The project is built with Ant  
>>>> and Ivy, which makes it easy to have all of the dependencies  
>>>> resolved. However, the Red5 class loader seems to still be having  
>>>> some issues with loading classes. The reason I believe that the  
>>>> project is not starting is because of all of the 'unnecessary'  
>>>> dependencies that Ivy satisfies anyway (eg. commons-logging etc.).
>>>>
>>>> On start of my server, the webapp begins to start, but my  
>>>> datasource (ComboPooledDataSource, I love c3p0) cannot find my  
>>>> database driver (com.mysql.jdbc.Driver) in the classpath. I have  
>>>> tried copying my JAR files from the webapp lib to the global lib,  
>>>> but if I do that, the server won't start at all. I'm ready to  
>>>> start messing around with the Java ClassLoader for Red5, since it  
>>>> seems to be the cause of my problems. How should I dive in to  
>>>> fixing that? Any tips, recommendations? I'd love to help lay this  
>>>> bug to rest, since it seems to have been present for so long.
>>>>
>>>>  - TK
>>>> (I can also attach my project to the list if that's helpful at  
>>>> all, but I'll probably just post it to JIRA)
>>>>
>>>> -- 
>>>> And do this, knowing the time, that now it is high time to awake  
>>>> out of sleep;
>>>> for now our salvation is nearer than when we first believed.
>>>>
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