The Kloudly Letter — Issue #01

The Kloudly Letter

KLOUDLY ACADEMY
The Kloudly Letter

Issue #1
2026-09-14

Friendly, practical Java & Spring news for professional developers. No fluff.

1. Latest from Kloudly Academy

Thread Communication in Java (July 21, 2026) — Learn about thread communication in Java and how threads can efficiently interact with each other in your applications.

Thread Synchronization in Java (June 14, 2026) — Learn about thread synchronization and how it helps prevent data corruption when managing concurrent threads in Java.

Thread Lifecycle in Java (June 09, 2026) — Explore the Thread Lifecycle in Java. Learn the states a thread goes through and how to manage them effectively in programming.

2. Java Tip

Use List.of() to Create an Unmodifiable List

List.of() creates an unmodifiable list in a single line. It is ideal for fixed values such as supported formats, roles, or configuration options.

Keep these restrictions in mind:

add(), remove() and set() throw UnsupportedOperationException.
null elements are not accepted.
The contained objects can still be mutable.

Available since Java 9, it is usually clearer than creating a mutable list and wrapping it with Collections.unmodifiableList().

import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<String> formats = List.of("JSON", "XML", "CSV");

        System.out.println(formats); // [JSON, XML, CSV]

        try {
            formats.add("YAML");
        } catch (UnsupportedOperationException e) {
            System.out.println("The list cannot be modified");
        }
    }
}

Takeaway: Use List.of() when you need a concise list whose structure must not be modified.

3. Code Review Corner

Replace Nested Conditions with Guard Clauses

What would you improve in this code?

Before

public void sendWelcomeEmail(User user) {
    if (user != null) {
        if (user.isActive()) {
            if (user.getEmail() != null) {
                emailService.sendWelcomeEmail(user.getEmail());
            }
        }
    }
}

What’s the issue? Each condition adds another level of indentation. The method’s main action becomes buried, and the code gets harder to scan as more rules are added.

After

public void sendWelcomeEmail(User user) {
    if (user == null) {
        return;
    }

    if (!user.isActive()) {
        return;
    }

    if (user.getEmail() == null) {
        return;
    }

    emailService.sendWelcomeEmail(user.getEmail());
}

Why it’s better: Guard clauses handle invalid cases immediately and keep the successful path visible. Each rule is also easier to identify, change, and test.

Takeaway: Exit early when a condition prevents the method from doing its job. Keep the successful path simple and visible.

4. Java & Spring Watch

JDK 27 Runtime Updates Release Notes — Java
This release note reviews performance updates, new runtime features, and changes to existing features included in JDK 27. It is directly focused on runtime-level changes in the upcoming Java release.
Why it matters: JDK release notes are essential for developers planning upgrades because runtime changes can affect application behavior, performance, and production operations.

Acceleration of Curve25519 Field Operations with Java Software and Intrinsics — Java
This article highlights improved Curve25519 field performance in JDK 27 and JDK 28. It focuses on acceleration delivered through Java software and intrinsics.
Why it matters: Performance improvements in cryptographic operations can benefit production systems that rely on secure networking or cryptography-heavy workloads.

Spring Tools 5.4.0 released — Spring
Spring announced the release of Spring Tools 5.4.0. The provided article data does not include further details about specific fixes or changes.
Why it matters: Among the available Spring items, this is the only actual release announcement rather than a podcast or roundup, so it is the most relevant update for developers using the Spring toolchain.

5. Next on Kloudly Academy

Managing Tasks with ExecutorService

Next, we’ll move beyond creating threads manually and explore how ExecutorService manages reusable thread pools, submits tasks and shuts down cleanly.

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Noel Kamphoa · 61 Rue Gabriel Peri · Houilles 78800 · France

Kloudly Academy

The Kloudly Letter — Issue #01

Noel KAMPHOA

Noel KAMPHOA