code: @Test public void should_insert_not_null_field_overriding_global_config() throws Exception {
    Long id=RandomUtils.nextLong();
    EntityWithNotNullInsertStrategy entity=new EntityWithNotNullInsertStrategy();
    entity.setId(id);
    entity.setName("Helen");
    entity.setLabel("label");
    manager1.persist(entity);
    entity.setLabel(null);
    manager1.persist(entity);
    final EntityWithNotNullInsertStrategy found=manager1.find(EntityWithNotNullInsertStrategy.class,id);
    assertThat(found.getName()).isEqualTo("Helen");
    assertThat(found.getLabel()).isEqualTo("label");
  }
  