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Errors Beginner

Objects.requireNonNullElse()

Get a non-null value with a clear default, no ternary needed.

Code Comparison

✕ Java 8

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

✓ Java 9+

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

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Why the modern way wins

📖

Clear intent

Method name describes exactly what it does.

🛡️

Null-safe default

The default value is also checked for null.

📏

Readable

Better than ternary for simple null-or-default logic.

Old Approach

Ternary Null Check

Modern Approach

requireNonNullElse()

Since JDK

Difficulty

Beginner

JDK Support

Objects.requireNonNullElse()

Available

Widely available since JDK 9 (Sept 2017)

How it works

requireNonNullElse returns the first argument if non-null, otherwise the second. The default itself cannot be null — it throws NPE if both are null, catching bugs early.

Helpful NullPointerExceptions

Java 8

// Old NPE message:
// "NullPointerException"
// at MyApp.main(MyApp.java:42)
// Which variable was null?!

Java 14+

// Modern NPE message:
// Cannot invoke "String.length()"
// because "user.address().city()"
// is null
// Exact variable identified!

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JDK 14+ →

Errors Intermediate

Record-based error responses

Java 8

// Verbose error class
public class ErrorResponse {
    private final int code;
    private final String message;
    // constructor, getters, equals,
    // hashCode, toString...
}

Java 16+

public record ApiError(
    int code,
    String message,
    Instant timestamp
) {
    public ApiError(int code, String msg) {
        this(code, msg, Instant.now());
    }
}

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JDK 16+ →

Errors Beginner

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");

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JDK 9+ →