Branch: refs/heads/master Home: https://github.com/hibernate/hibernate-ogm Commit: 2121b331c71f884ed667aa66e4c1cfbdf05019f6 https://github.com/hibernate/hibernate-ogm/commit/2121b331c71f884ed667aa6... Author: Emmanuel Bernard <emmanuel(a)hibernate.org&gt; Date: 2014-12-10 (Wed, 10 Dec 2014) Changed paths: M core/src/main/java/org/hibernate/ogm/datastore/map/impl/MapHelpers.java M core/src/main/java/org/hibernate/ogm/model/spi/Association.java M core/src/main/java/org/hibernate/ogm/model/spi/AssociationOperationType.java M ehcache/src/main/java/org/hibernate/ogm/datastore/ehcache/EhcacheDialect.java M neo4j/src/main/java/org/hibernate/ogm/datastore/neo4j/Neo4jDialect.java Log Message: ----------- OGM-678 Remove AssociationOperationType.PUT_NULL operation It was never used and is quite doubtful it would be necessary. I added a Contracts.assertNotNull on association.put to prevent setting the value to null.