Netty optimizations + fastjson2

frameworks/Java/netty-fast/.sdkmanrc

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+# Enable auto-env through the sdkman_auto_env config
+# Add key=value pairs of SDKs to use below
+java=25-oracle

frameworks/Java/netty-fast/README.md

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+# Netty (Fast / Minimal)
+
+This is a Netty-based implementation for the TechEmpower Framework Benchmarks.
+It is a minimal, high-performance HTTP/1.1 server built directly on Netty
+primitives with a focus on correctness and low overhead.
+
+The implementation uses real HTTP parsing, proper response headers, and
+standards-compliant behavior while aggressively minimizing allocations and
+framework abstractions.
+
+## Tests
+
+### Plaintext Test
+Responds with a static plaintext message.
+
+GET /plaintext
+
+Response body:
+Hello, World!
+
+Content-Type:
+text/plain
+
+### JSON Test
+Responds with a JSON-encoded object using a real JSON serializer.
+
+GET /json
+
+Response body:
+{"message":"Hello, World!"}
+
+Content-Type:
+application/json
+
+JSON serialization is performed using fastjson2.
+
+## Implementation Notes
+
+- HTTP/1.1 only
+- Pipelining supported
+- Uses Netty event loops and pooled buffers
+- Minimal channel pipeline
+- No framework abstractions beyond Netty itself
+- Optimized for low allocation rate and high throughput
+- Designed to match TechEmpower benchmark rules and expectations
+
+This implementation is intended to demonstrate the maximum achievable
+performance of Netty when used as a low-level HTTP server.
+
+## Versions
+
+- Java 24+ (tested with Java 24 / 25)
+- Netty 4.2.x
+- fastjson2
+
+## References
+
+- https://netty.io/
+- https://github.com/netty/netty
+- https://github.com/TechEmpower/FrameworkBenchmarks

frameworks/Java/netty-fast/benchmark_config.json

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+{
+  "framework": "netty-fast",
+  "tests": [{
+    "default": {
+      "json_url": "/json",
+      "plaintext_url": "/plaintext",
+      "port": 8080,
+      "approach": "Realistic",
+      "classification": "Platform",
+      "database": "None",
+      "framework": "netty-fast",
+      "language": "Java",
+      "flavor": "None",
+      "orm": "Raw",
+      "platform": "Netty",
+      "webserver": "None",
+      "os": "Linux",
+      "database_os": "Linux",
+      "display_name": "netty-fast",
+      "notes": "",
+      "versus": "netty-fast"
+    }
+  }]
+}

frameworks/Java/netty-fast/config.toml

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+[framework]
+name = "netty-fast"
+
+[main]
+urls.plaintext = "/plaintext"
+urls.json = "/json"
+approach = "Realistic"
+classification = "Platform"
+database = "None"
+database_os = "Linux"
+os = "Linux"
+orm = "Raw"
+platform = "Netty"
+webserver = "None"
+versus = "netty-fast"

frameworks/Java/netty-fast/netty-fast.dockerfile

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+FROM maven:3.9-eclipse-temurin-25-noble as maven
+WORKDIR /netty-fast
+COPY pom.xml pom.xml
+COPY src src
+RUN mvn -q -DskipTests package
+
+FROM eclipse-temurin:25-jre-noble
+WORKDIR /netty-fast
+COPY --from=maven /netty-fast/target/app.jar ./app.jar
+COPY run_netty.sh ./run_netty.sh
+RUN chmod +x ./run_netty.sh
+EXPOSE 8080
+ENTRYPOINT ["./run_netty.sh"]

frameworks/Java/netty-fast/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.techempower</groupId>
+    <artifactId>netty-example</artifactId>
+    <version>0.1</version>
+
+    <properties>
+        <maven.compiler.source>24</maven.compiler.source>
+        <maven.compiler.target>24</maven.compiler.target>
+        <netty.version>4.2.0.Final</netty.version>
+    </properties>
+
+    <packaging>jar</packaging>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <version>${netty.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-transport-native-epoll</artifactId>
+            <version>${netty.version}</version>
+            <classifier>linux-x86_64</classifier>
+        </dependency>
+
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-transport-native-kqueue</artifactId>
+            <version>${netty.version}</version>
+            <classifier>osx-x86_64</classifier>
+        </dependency>
+
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-transport-native-kqueue</artifactId>
+            <version>${netty.version}</version>
+            <classifier>osx-aarch_64</classifier>
+        </dependency>
+
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-transport-native-io_uring</artifactId>
+            <version>${netty.version}</version>
+            <classifier>linux-x86_64</classifier>
+        </dependency>
+
+        <dependency>
+            <groupId>com.alibaba.fastjson2</groupId>
+            <artifactId>fastjson2</artifactId>
+            <version>2.0.53</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.0</version>
+                <configuration>
+                    <debug>false</debug>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <finalName>app</finalName>
+                    <archive>
+                        <manifest>
+                            <mainClass>hello.HelloWebServer</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <appendAssemblyId>false</appendAssemblyId>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+        </plugins>
+    </build>
+</project>

frameworks/Java/netty-fast/run_netty.sh

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+#!/bin/bash
+
+# PROFILING: -XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
+JAVA_OPTIONS="--enable-native-access=ALL-UNNAMED \
+  -Dio.netty.noUnsafe=false \
+  --sun-misc-unsafe-memory-access=allow \
+  --add-opens=java.base/java.lang=ALL-UNNAMED \
+  -XX:+UseNUMA \
+  -XX:+UseParallelGC \
+  -Dio.netty.buffer.checkBounds=false \
+  -Dio.netty.buffer.checkAccessible=false \
+  $@"
+
+exec java $JAVA_OPTIONS -jar app.jar

frameworks/Java/netty-fast/src/main/java/hello/Constants.java

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+package hello;
+
+import io.netty.util.AsciiString;
+import io.netty.util.CharsetUtil;
+
+public final class Constants {
+
+    public static final byte[] STATIC_PLAINTEXT = "Hello, World!".getBytes(CharsetUtil.UTF_8);
+    public static final int STATIC_PLAINTEXT_LEN = STATIC_PLAINTEXT.length;
+    public static final CharSequence PLAINTEXT_CLHEADER_VALUE =
+        AsciiString.cached(String.valueOf(STATIC_PLAINTEXT_LEN));
+
+    public static final CharSequence SERVER_NAME = AsciiString.cached("Netty");
+
+    public static final Message STATIC_MESSAGE = new Message("Hello, World!");
+
+    private Constants() {
+    }
+}