Previously the backend identifier derived from the URI was set as identifier on the object to be created in a PUT request. However, in case a custom entity lookup is used, this is not the identifier but an arbitrary property pointed to through user defined code, mostly a method reference.
We now use the newly introduced MethodInvocationRecorder API in Spring Data Commons to be able to obtain the property that is supposed to be used and set that to the value calculated. This requires the entity type for which the custom lookup is configured to be non-final as the invocation recording is build on top of proxies.
Related tickets: DATACMNS-1449.
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