HHH-8310 [1] mentions a Spring bug SPR-11125 [2] that results in threads having 
a different ContextClassLoader (CCL) than their caller. As a result, 
SerializableBlobProxy.generateProxy() throws IllegalArgumentException because 
WrappedBlob is not found. The same happens for 
SerializableClobProxy.generateProxy() because WrappedClob is not found.

IIUC, this will be fixed by accessing the ClassLoaderService in Hibernate 5.

I'm looking for either a fix or workaround for this in Hibernate 4.2.x and 
4.3.x.

A) A possible fix for HHH-8310 suggests using the ClassLoader returned by 
WrappedBlob.class.getClassLoader(). Could this somehow get an unintended 
ClassLoader? 

B) A workaround is for the caller to initialize 
ClassLoaderHelper.overridenClassLoader before calling Spring.

Which would be more appropriate?

Thanks,
Gail

[1] https://hibernate.atlassian.net/browse/HHH-8310
[2] https://jira.spring.io/browse/SPR-11125
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