[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3836) composite-element with null columns in map is ignored

composite-element with null columns in map is ignored ----------------------------------------------------- Key: HHH-3836 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3836 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.0.SP1 Environment: 3.3.0 SP1, noticed with Oracle and H2 but probably happens with all databases Reporter: Benoit Goudreault-Emond Attachments: HHH-3836.zip, patate.zip When a composite element with all properties set to NULL is inserted in a map of the said composite element, the data gets inserted to the database but is never retreived when reloading the entity. For instance, with an entity @Entity public class TestEntity { @Id private int id; @CollectionOfElements private Map<String, AccessPeriod> roleAccesses = new HashMap<String, AccessPeriod>(); // boilerplate getters/setters/etc omitted } And AccessPeriod being @Embeddable public class AccessPeriod { public Date startDate; public Date endDate; } If you insert in the map an AccessPeriod with both startDate and endDate set to null and persist the TestEntity, an entry is inserted in the auxiliary table, but when getting the TestEntity back, the map is empty. You get the same problem with a mapping file. This used to work in Hibernate 2.1--I found this out while porting some code to 3.3. See the attached example. You'll need to include Hibernate and h2 (com.h2database:h2 1.0.20061217) on your classpath to run it with the given jdbc.properties, but feel free to change it.