r/java

Hey everyone,

I’ve been working on a lightweight HTTP server prototype called FastJava, and I wanted to share its current progress. The main goal of this project is to explore low-indirection internals and utilize Java's Vector API (jdk.incubator.vector) for SIMD-assisted parsing.

It exposes a servlet-style API inspired by Tomcat and Jakarta Servlet (though it isn't fully binary-compatible with the complete servlet spec yet).

I recently ran some cross-framework benchmarks, and the results have been really promising.

The Benchmarks (Throughput):

I tested a simple GET /hello endpoint (150,000 requests, 64 concurrency, isolated JVM per server). FastJava managed to edge out some of the heavyweights in pure throughput:

Aggregate median results:

| Server | Throughput (req/s) | Avg Latency (ms) | p95 (ms) | p99 (ms) | Errors |

|---|---:|---:|---:|---:|---:|

| FastJava | 106993.25 | 0.593 | 1.086 | 2.046 | 0 |

| Undertow | 93112.02 | 0.680 | 1.294 | 2.364 | 0 |

| Netty | 82846.07 | 0.766 | 1.573 | 2.676 | 0 |

| Tomcat | 74225.89 | 0.859 | 1.793 | 2.655 | 0 |

You can checkout project at https://github.com/tanoaks14/fastJava

We've already had a few big Java conferences in 2026. For example:

1. jfokus 2026 - https://www.youtube.com/playlist?list=PLUQORQEatnJflEzaKxmnn2EH0eKPTVBI8
2. java one 2026 - https://www.youtube.com/playlist?list=PLX8CzqL3ArzUMVSzm-z_-if8BIB55EGl4
3. Devnexus 2026 - https://www.youtube.com/playlist?list=PLid93BOrASLONoZUIX1i0rXqCji5FUw9V
4. Voxxed Days CERN 2026 - https://www.youtube.com/playlist?list=PLRsbF2sD7JVq9Y7_i6uCWlxwoEIte7S8S

Have you enjoyed any specific talks that you'd be happy to recommend?

Hey r/java,

I've been working on JADEx (Java Advanced Development Extension) which is a safety layer that makes Java safer by adding Null-Safety and Final-by-Default semantics without rewriting Java codes and modifying the JVM.

Quick recap of what JADEx adds to Java:

• String? nullable type declaration
• ?. null-safe access operator
• ?: Elvis operator
• apply readonly final-by-default mode per file

Today I'm sharing three things that just landed.

---

1. Lombok support

This was the most requested thing. JADEx now integrates with Lombok via a Delombok pipeline internally. The key motivation: JADEx's nullability checker needs to see Lombok-generated code (getters, builders, constructors) to avoid blind spots. Without Delombok, nullable fields could silently pass through generated methods unchecked.

@Data
@Builder
@Entity
public class User {
    private String name;
    private String? email;      // @Nullable propagated to getter + builder param
    private Address? address;   // @Nullable propagated to getter + builder param
}

After Delombok, JADEx sees and analyzes the generated code:

// Lombok-generated — JADEx propagates @Nullable into these
@Nullable
public String getEmail() { return this.email; }

public UserBuilder email(@Nullable final String email) { ... }
public UserBuilder address(@Nullable final Address address) { ... }

---

2. Gradle plugin published

The JADEx Gradle plugin is now on Maven Central and the Gradle Plugin Portal.

plugins {
    id 'io.github.nieuwmijnleven.jadex' version '0.628'
}

jadex {
    sourceDir = 'src/main/jadex'
}

That's the only change needed to an existing Spring Boot project. Everything else (compilation, Delombok pipeline, .java generation) is handled automatically.

---

3. JADEx Spring Boot example project

• full description

  • https://github.com/nieuwmijnleven/JADEx/blob/master/SpringBootExample.md

• source repository

  • https://github.com/nieuwmijnleven/jadex-springboot-example

---

We highly welcome your feedback on JADEx.

Thank you.