GeezerVison is showing javaevolved.dev — Optional.orElseThrow() without supplier | java.evolved

Home / Errors / Optional.orElseThrow() without supplier

Errors Beginner

Optional.orElseThrow() without supplier

Use Optional.orElseThrow() as a clearer, intent-revealing alternative to get().

Code Comparison

✕ Java 8

// Risky: get() throws if empty, no clear intent
String value = optional.get();

// Verbose: supplier just for NoSuchElementException
String value = optional
    .orElseThrow(NoSuchElementException::new);

✓ Java 10+

// Clear intent: throws NoSuchElementException if empty
String value = optional.orElseThrow();

Share 𝕏

See a problem with this code? Let us know.

Why the modern way wins

📖

Self-documenting

orElseThrow() clearly signals that absence is unexpected.

🔒

Avoids get()

Static analysis tools flag get() as risky; orElseThrow() is idiomatic.

⚡

Less boilerplate

No need to pass a supplier for the default NoSuchElementException.

Old Approach

get() or orElseThrow(supplier)

Modern Approach

orElseThrow()

Since JDK

Difficulty

Beginner

JDK Support

Optional.orElseThrow() without supplier

Available

Available since JDK 10 (March 2018).

How it works

Optional.get() is widely considered a code smell because it hides the possibility of failure. The no-arg orElseThrow(), added in Java 10, does exactly the same thing but makes the intent explicit: the developer expects a value and wants an exception if absent.

Optional chaining

Java 8

String city = null;
if (user != null) {
    Address addr = user.getAddress();
    if (addr != null) {
        city = addr.getCity();
    }
}
if (city == null) city = "Unknown";

Java 9+

String city = Optional.ofNullable(user)
    .map(User::address)
    .map(Address::city)
    .orElse("Unknown");

Hover to see modern ➜

JDK 9+ →

Streams Intermediate

Optional.or() fallback

Java 8

Optional<Config> cfg = primary();
if (!cfg.isPresent()) {
    cfg = secondary();
}
if (!cfg.isPresent()) {
    cfg = defaults();
}

Java 9+

Optional<Config> cfg = primary()
    .or(this::secondary)
    .or(this::defaults);

Hover to see modern ➜

JDK 9+ →

Errors Beginner

Objects.requireNonNullElse()

Java 8

String name = input != null
    ? input
    : "default";
// easy to get the order wrong

Java 9+

String name = Objects
    .requireNonNullElse(
        input, "default"
    );

Hover to see modern ➜

JDK 9+ →