sling-org-apache-sling-engine

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sling-org-apache-sling-engine

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Apache Sling Engine Implementation

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# Apache Sling Engine Implementation

This module is part of the [Apache Sling](https://sling.apache.org) project and implements the core Sling request processing pipeline.

## Overview

`org.apache.sling.engine` provides the Sling engine bundle that:

- registers the main servlet via OSGi HTTP Whiteboard
- resolves resources and dispatches requests
- manages Sling filter chains and request/response wrapping
- exposes request processor and filter processor metrics via JMX
- supports both `javax.servlet` (legacy) and `jakarta.servlet` through adapter classes

## Requirements

- Java 17
- Maven

## Build and test

```bash
# Build and package (skip tests)
mvn clean install -DskipTests

# Full build with tests
mvn clean install

# Run all tests
mvn test

# Run a single test class
mvn test -Dtest=SlingRequestPathInfoTest

# Run tests with a name pattern
mvn test -Dtest="*FilterChain*"

# License header check (Apache RAT)
mvn apache-rat:check

# Check formatting (Spotless, inherited from parent POM)
mvn spotless:check

# Apply formatting
mvn spotless:apply

# Run Japex microbenchmarks
mvn test -Pbenchmarks
```

## Repository layout

```text
pom.xml                          Maven build descriptor
bnd.bnd                          OSGi bundle manifest instructions
src/
  main/java/org/apache/sling/engine/
    *.java                       Public API
    impl/                        Internal implementation
      adapter/                   javax <-> jakarta servlet adapters
      console/                   Web Console plugins
      debug/                     RequestProgressTracker integration
      filter/                    Sling filter chain management
      helper/                    Servlet context/request listener helpers
      log/                       Request logging support
      parameters/                Request parameter and multipart handling
      request/                   Request data and dispatching
    jmx/                         JMX MBean interfaces
    servlets/                    Error handler servlet API
  test/java/                     Unit tests
  test/resources/japex/          Benchmark configurations
```

## Notes

- OSGi Declarative Services annotations are used (`org.osgi.service.component.annotations`).
- The bundle imports `javax.servlet` with a compatibility range and supports Jakarta Servlet API in parallel.

sling-org-apache-sling-engine

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