reflection-analyzer-java

Java Reflection Metadata Analyzer

A tool designed to inspect Java class hierarchies using the Java Reflection API. This project scans type systems to identify and rank classes based on structural metrics such as field counts, method signatures, and inheritance depth.

Technical Overview

Type Inspection: Traverses class hierarchies to calculate declared and inherited members.
Module System Awareness: Loads and filters types from the Java 21 boot layer, specifically targeting java.* and jdk.* packages.
Metric-Based Ranking: Ranks the “Top N” classes based on fields, unique method signatures, and subtype/supertype counts.

Features

Hierarchy Traversal: Analyzes fields and methods while respecting access modifiers, such as filtering private members from superclasses.
Uniqueness Checking: Uses Java Sets to manage same-named methods or fields resulting from overloading, overriding, or shadowing.
Filtering: Skips special entries like package-info, module-info, and META-INF to focus on functional classes.
Flexible Data Input: Supports scanning the entire JDK or analyzing targeted libraries via input files.

Usage

1. JDK Analysis

Analyze the top 10 classes within the standard Java libraries:

java Main 10

2. Targeted Analysis

Analyze specific classes from an input file and save results to an output file:

java -cp .;libraries\commons-lang3-3.17.0.jar Main resources\input.txt resources\output.txt 10

Documentation

The API documentation, generated via Javadoc, is available here: Javadoc Page

Building and Running

The project is structured for command-line execution. Ensure you are in the root directory before running these commands.

1. Compile

javac -d bin -cp "libraries/*" ClassScanner.java Main.java

2. Run (JDK Mode)

java -cp "bin;libraries/*" Main 10

3. Run (Target File Mode)

java -cp "bin;libraries/*" Main resources/input.txt resources/output.txt 10

License

This project is licensed under the MIT License.

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