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Scopes in WARs

Justin Chu
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Joined: Apr 19, 2002
Posts: 209
    
    1
Is it ok to have different versions of the same class in different WARs?
If I implement a singleton object, will they be the same object when called from different WARS?
Thanks
Chu
Junaid Bhatra
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Joined: Jun 27, 2000
Posts: 213
Generally different .wars are loaded by separate classloaders. Hence there will be multiple (and incompatible) copies of any common classes present in those wars. For eg, a singleton won't really be a singleton, and each war will load it's own copy of the class.
If you truly want, say a singleton, it should be present up the classloader hierarchy. This can be achieved by placing it in the classpath. This is generally how containers load classes, although there's no guarantee.
 
Don't get me started about those stupid light bulbs.
 
subject: Scopes in WARs