Applied pull request #691 to Activiti 6 branch

modules/activiti-engine/src/main/java/org/activiti/engine/impl/db/DbSqlSessionFactory.java

@@ -340,7 +340,7 @@ public class DbSqlSessionFactory implements SessionFactory {
   }
   
   public Boolean isBulkInsertable(Class<? extends Entity> entityClass) {
-  	return bulkInsertableMap != null && bulkInsertableMap.get(entityClass);
+  	return bulkInsertableMap != null && bulkInsertableMap.containsKey(entityClass);
   }
 
   // getters and setters //////////////////////////////////////////////////////

modules/activiti5-engine/src/main/java/org/activiti5/engine/impl/db/DbSqlSessionFactory.java

@@ -332,7 +332,7 @@ public class DbSqlSessionFactory implements SessionFactory {
   }
   
   public Boolean isBulkInsertable(Class<? extends PersistentObject> persistentObjectClass) {
-  	return bulkInsertableMap != null && bulkInsertableMap.get(persistentObjectClass);
+  	return bulkInsertableMap != null && bulkInsertableMap.containsKey(persistentObjectClass);
   }
 
   // getters and setters //////////////////////////////////////////////////////