code: public static QueryBuilder byInstanceId(Object localId, Class entityClass){
          Validate.argumentsAreNotNull(localId, entityClass);
          return new QueryBuilder(new IdFilterDefinition(instanceId(localId, entityClass)));
      }
docs: Query for selecting changes (or snapshots) made on a concrete Entity instance.
  <br/><br/>
  
  For example, last changes on "bob" Person:
  <pre>
  javers.findChanges( QueryBuilder.byInstanceId("bob", Person.class).build() );
  </pre>