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A question about ClassLoader

 
Greenhorn
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Hi all:

The following code is extracted from org.apache.commons.chain.CatalogFactory source code.

Who can tell me under what conditions, Thread.currentThread().getContextClassLoader()==null,and fall down to execute

Why did it do this ?
Thanks for any comments !

Basell
 
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From the Javadoc of Thread.getContextClassLoader():

Returns:
the context ClassLoader for this Thread, or null indicating the system class loader (or, failing that, the bootstrap class loader)

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