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spring data JPA optional.orelse does not work correctly


By : star
Date : October 16 2020, 06:10 AM
To fix this issue
I don't know why does [...] always go into the orElse block even I verified the first part is present
code :
Country country = countryService
        .findCountryByName(DEFAULT_COUNTRY_NAME)
        .orElseGet(() -> countryService.create(createCountryEntity()));


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spring-data JpaRepository Optional orElse duplicate entity


By : Thanh Cao
Date : March 29 2020, 07:55 AM
this will help I got 2 versions of the same code (i assume): , the right solution to solve this is
code :
UserHolder userHolder = userHolderRepository
            .findOneByUserId(source.getId())
            .orElseGet(() ->userHolderRepository.save(new UserHolder(source.getId(), source.getLogin())));

        return userHolder;

How to prevent the function passed to Optional's orElse from being executed when the Optional is not empty?


By : Mukta
Date : March 29 2020, 07:55 AM
hope this fix your issue someFunction() gets executed since it's an argument passed to a method, and the arguments passed to a method are evaluated before the method is executed. To avoid the execution, you should pass someFunction() within a Supplier instance.
Use orElseGet instead of orElse :
code :
Optional.ofNullable(someValue).orElseGet(SomeClass::someFunction);
Optional.ofNullable(someValue).orElseGet(()->someFunction());

Parameter of Optional.orElse gets called even when Optional contains value


By : ud2012
Date : March 29 2020, 07:55 AM
will be helpful for those in need The orElse method looks like this:
code :
public T orElse(T other) {
   return value != null ? value : other;
}
public static void main(String[] args){
    String o = Optional.ofNullable("world").map(str -> "hello" + str)
                   .orElseGet(() -> dontCallMe());
    System.out.println(o);
}

private static String dontCallMe() {
    System.out.println("should not have called");
    return "why oh why";
}
helloworld

java8, optional.orElse() not working but optional.orElseGet() work


By : Calotte Calotte
Date : March 29 2020, 07:55 AM
To fix the issue you can do Just as Eran mentioned, there is a difference between orElse and orElseGet, no matter what the Optional is the method directly invoked in orElse will be executed while the orElseGet will invoke the supplier if and only if the optional is null.
Here is a small demo:
code :
public class TestOptional {
    public static void main(String... args) {
        Optional<String> val = Optional.ofNullable("Hello");
        String s = val.orElse(test());
        System.out.println(s);
        s = val.orElseGet(() -> test());
        System.out.println(s);
    }

    public static String test() {
        System.out.println("Hello world");
        return "hi";
    }
}
Hello world
Hello
Hello

Defaulting Optional orElse with Optional.empty in Java 8


By : user3612647
Date : March 29 2020, 07:55 AM
Any of those help Combine both the list using Stream.of and check for element or return Optional.empty()
code :
Stream.of(lunches, dinners)
      .flatMap(List::stream)
      .filter(s -> s.getName()
                    .equalsIgnoreCase(name))
      .findFirst();
Stream.concat(lunches.stream(), dinners.stream())
      .filter(s -> s.getName()
                    .equalsIgnoreCase(name))
      .findFirst();
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