What is wrong with this Optional<Class> here?

BdEngineer :

I am trying to iterate list of objects

Optional<QueryEntities>  entities =  InputYamlProcessor.process(ymlFilename);

entities.orElseThrow( ()->{
               logger.error("Unable to parse YAL ,Correct YML and retry");
               new NoExtractorDefinedException("Unable to parse YAL ,Correct YML and retry");
           });

Getting error as below :

The method orElseThrow(Supplier) in the type Optional is not applicable for the arguments (() -> {})

What is wrong am i dong here ?

if QueryEntities class is as belw :

public class QueryEntities {

    List<QueryEntity> entitiesList;
   }

How to access each QueryEntity and retrieve its fields and print.

Smutje :

Optional#orElseThrow

takes a

Supplier<? extends X> exceptionSupplier

(see Optional, Supplier)

so you must provide it with one:

entities.orElseThrow(() -> {
       logger.error("Unable to parse YAL ,Correct YML and retry");
       return new NoExtractorDefinedException("Unable to parse YAL ,Correct YML and retry");
});

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