### Question:
AnnotatedFieldMappers { protected synchronized void unbind(AnnotatedFieldMapper<?, ?> mapper) { if (mapper == null) { return; } this.fieldMappers.removeValue(mapper); this.cache.clear(); }  Collection<AnnotationMapping<?, ?>> get(MappedFieldMetaData metaData);  }### Answer:
@Test public void testRemovalOfNullMapperDoesNotCauseException() { unbind(null); }