I've tried with different hibernate-core dependencies from 4.1.5.Final to 4.1.7.Final and it works with any of them. The bug causing the NPE seems to be introduced in 4.1.8., relevant to new code of lines 488-494 of SessionFactoryImpl containing the settings.getMultiTableBulkIdStrategy().prepare(...) call. Shouldn't this be prevented when using OGM?

Oops thanks for clarifying, you're absolutely right I hadn't tested 4.1.8 yet. Yes we need to prevent this.

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