G'day everyone,

Creating an org.apache.chemistry.opencmis.client.api.Session is quite an 
expensive operation (it typically takes several seconds), so I'm looking to 
cache Session objects in a per-user cache in my client app so that I don't have 
to recreate Sessions for every single interaction with the CMIS server.

Unfortunately the cache library I'm using requires that cached objects 
implement java.io.Serializable, which Session does not.  However the default 
implementation class (org.apache.chemistry.opencmis.client.runtime.SessionImpl) 
does in fact implement Serializable, allowing me the workaround of casting the 
Session object to Serializable prior to adding to the cache.  I'm not 
particularly comfortable with this approach however, given that this seems to 
be an implementation detail and not officially part of the contract for 
Sessions.

Is there a compelling reason that Session doesn't implement Serializable?  Is 
this something that could be added (noting that this change is backwards 
compatible)?

Thanks in advance,
Peter

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