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Ok, managed to solve this. A property in the stored class contained a raft of non-persistent objects (java.util.Date etc) and was not set to transient, causing the exception.

Hi I'm facing a problem where an object is sporadically not storable. Occasionally, I get this stack trace when calling ObjectContainer.set: com.db4o.ext.ObjectNotStorableException: java.lang.Object@1d7089e    at com.db4o.internal.ClassMetadata.forObject(Unknown Source)    at ...