Encountering not-null constraint violations related to a secondary table for an entity in Hibernate

Issue

• An entity is defined with a non-optional secondary table

• After migrating from an older EAP / Hibernate release to EAP 7.2 (Hibernate 5.3), encountering not-null constraint violations in various scenarios for properties persisted in the secondary table

  ... java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("MYSCHEMA"."MY_JOIN_TABLE"."APROPERTY")
  
          at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:11190)
          at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:244)
          at org.jboss.jca.adapters.jdbc.WrappedStatement.executeBatch(WrappedStatement.java:1180)
          at org.hibernate.engine.jdbc.batch.internal.BatchingBatch.performExecution(BatchingBatch.java:118)
         ...
  

  ... javax.validation.ConstraintViolationException: Validation failed for classes [org.mypackage.MyEntity] during update time for groups [javax.validation.groups.Default, ]
  List of constraint violations:[
          ConstraintViolationImpl{interpolatedMessage='must not be null', propertyPath=aproperty, rootBeanClass=class org.mypackage.MyEntity, messageTemplate='{javax.validation.constraints.NotNull.message}'}
  ]
          at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:140)
          at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreUpdate(BeanValidationEventListener.java:88)
          at org.hibernate.action.internal.EntityUpdateAction.preUpdate(EntityUpdateAction.java:248)
          ...
          at org.hibernate.query.Query.getResultList(Query.java:135)
          ...