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Re: Using own classloader inside J2EE to load and unload own classes.

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On Tuesday, September 21, 2004 1:41:54 PM UTC+5:30, Stefan Siegl wrote:
> Hello it's me again,
> 
> I am currently writing my master thesis about a customer relationship 
> management (CRM) system. The special thing about this component is that 
> the model (the way the CRM data is described) can be changed at runtime. 
> That means I do not have the model at compile time. I already posted 
> here to get general hints from you guys (sry don't know how to link to 
> the other news message, but the name was: Compile java sources inside 
> J2EE component)
> 
> I specified the component in more detail and am currently trying to 
> integrate a persistence layer to persist data. My approach is to create 
> classes at runtime that reflect the current model and use instances of 
> these classes to represent data entered according to this model.
> 
> The classes are loaded by an own classloader and are not part of the 
> classpath of the J2EE container. If the model changes, new classes are 
> created internally and a new classloader instance is used to load these 
> classes. The old instance of my own classloader will not be used 
> anymore. Therefore the old classes will not be used anymore. Is this 
> possible or will I face problems with the J2EE container?
> 
> 
> Another question is the integration of persistence:
> 
> What I need is a persistence framework that can deal with this changing 
> of the classes at runtime. I thought that it might be possible with an 
> JDO implementation. As far as i understand, the PersistenceManager is 
> the central point of any JDO implementation and is responsible for 
> persisting objects. I wanted to use JDO with the JCA adapter inside a 
> J2EE application and provide the PersistenceManager with my own 
> classloader to provide the JDO implementation with the needed classes 
> that are created at runtime. The JDO specification defines that the 
> class should be loaded by a classForName method. Do you think it is 
> feasible (or possible) to change this method to use my own classloader 
> instead?
> 
> Thanks for your advice :)
> Stefan

Hi Stefan,

This is a old mail chain. I hope you have found a solution :) If so can you share with me ? I have a similar problem to load/unload set of classes when needed in a j2ee environment. I am looking at osgi and implementing it inside the business logic. Is there any other way ?

Thanks,
Abhishek

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Re: Using own classloader inside J2EE to load and unload own classes. abhishek.khuntia@gmail.com - 2013-07-01 22:05 -0700

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