defects4j

A Database of Real Faults and an Experimental Infrastructure to Enable Controlled Experiments in Software Engineering Research

✅SRepair: Powerful LLM-based Program Repairer with $0.029/Fixed Bug

Defects4J Dissection presents data to help researchers and practitioners to better understand the Defects4J bug dataset

⚙️ Program slicer based on the Mozilla Lithium Tool for Java (also dubbed as Tandem-FL).

Artifact of "Searching for Multi-Fault Programs in Defects4J", SSBSE 2021

Analysis of fault detection in source code using various static, dynamic, bug and test metrics

Automated test case purification for improving fault localization

A search-based automated program-repair tool for Java with LLM integration.

FailMapper: Failure-Scenario-Guided Unit Test Generation using Monte Carlo Tree Search (MCTS) and LLMs. Detects 233% more bugs than baselines on Defects4J. Covers 9 failure scenarios for automated bug detection in Java programs. [ASE 2025]

Replication package for 'Evaluating and Mitigating the Misguidance Effect of Buggy Code in LLM-Generated Unit Tests' (ISSTA 2026, DOI 10.1145/3832204)

Replication package for 'Do Coverage and Mutation Scores of LLM-Generated Test Suites Correlate With Their Effectiveness? (Replicability Study)' (ISSTA 2026)

Personal Blog

Detecting and explaining Java performance bugs with a fine-tuned LLM. Dataset of 490 bugs, code, and evaluation. IEEE AITest 2025.