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There is no need to copy immutable subobjects. Also, avoid using the subobject's {{clone()}} method because it can be overridden when the subobject's class is not final and produces only a shallow copy. The references to the subobjects themselves must be nonfinal so that defensive copying can occur. It is also inadvisable to use the {{writeUnshared()}} and {{readUnshared()}} methods as an alternative \[[Bloch 2008|AA. Bibliography#BlochReferences#Bloch 08]\]. |
Risk Assessment
Failure to defensively copy mutable components during deserialization can violate the immutability contract of an object.
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