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weblogic class loaders(ejb and web)

srinivasrao marri
Ranch Hand

Joined: Feb 13, 2001
Posts: 61
Now a days ever application/web server provider is giving us the class loaders, like ejb class loader and web classloader. why they are providing these class loaders? what are the advantages i get by using them?
Lasse Koskela
author
Sheriff

Joined: Jan 23, 2002
Posts: 11962
    
    5
The classloaders are a part of the J2EE specification and also an essential part of a J2EE developer's nigthmares...
Basically the existence of several classloaders can be seen as a "sandboxing method". That is, to allow two applications to coexist without interfering each other. For example, if two enterprise applications are being deployed into a single WebLogic and both are using Log4J for logging, would you like both of the applications to use the same logger instances due to a singleton class being "shared" between the two applications?


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subject: weblogic class loaders(ejb and web)