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language:
- code
license: apache-2.0
task_categories:
- text-generation
tags:
- code
- refactoring
- java
- benchmark
---
# Java Refactoring Benchmark
## Task
Given a Java source file before a refactoring and the refactoring type, produce the refactored file.
## Schema
- `instance_id` — unique identifier
- `repo` — GitHub repo (owner/name)
- `language` — "java"
- `base_commit` — parent SHA (before state)
- `merge_commit` — commit where refactoring was applied
- `refactoring_types` — list of RefactoringMiner type names detected in this commit
- `refactoring_descriptions` — corresponding human-readable descriptions
- `file_path` — primary changed Java file (most lines changed)
- `source_code_before` — full file content before refactoring
- `source_code_after` — full file content after refactoring (ground truth)
- `diff` — full unified diff of the commit (all changed files)
- `is_pure_refactoring` — null = not yet checked; true = no extraneous changes
- `compile_before` / `compile_after` — null = not yet verified
- `PASS_TO_PASS` / `FAIL_TO_PASS` — null = not yet verified
- `created_at` — commit timestamp (ISO 8601)
- `repo_license` — SPDX license of the source repo
- `lines_changed` — total lines changed in the commit
## Split
- `test`: 5857 instances from 23 repos
## Refactoring types
{
"Change Variable Type": 2443,
"Add Method Annotation": 2338,
"Change Return Type": 1690,
"Change Parameter Type": 1595,
"Extract Method": 1398,
"Add Parameter": 1351,
"Rename Method": 1306,
"Extract Variable": 1283,
"Change Method Access Modifier": 1183,
"Rename Variable": 1089,
"Remove Method Annotation": 1018,
"Change Attribute Type": 957,
"Rename Parameter": 852,
"Remove Thrown Exception Type": 738,
"Add Attribute Modifier": 656,
"Remove Parameter": 611,
"Inline Variable": 595,
"Extract And Move Method": 586,
"Change Attribute Access Modifier": 572,
"Rename Attribute": 517,
"Move Method": 510,
"Add Class Annotation": 419,
"Pull Up Method": 392,
"Encapsulate Attribute": 310,
"Modify Method Annotation": 287,
"Move Class": 282,
"Add Attribute Annotation": 270,
"Add Method Modifier": 263,
"Add Thrown Exception Type": 238,
"Rename Class": 235,
"Change Class Access Modifier": 224,
"Modify Class Annotation": 213,
"Replace Variable With Attribute": 212,
"Remove Attribute Modifier": 211,
"Inline Method": 207,
"Move Code": 196,
"Remove Class Annotation": 192,
"Parameterize Variable": 186,
"Add Parameter Modifier": 185,
"Pull Up Attribute": 182,
"Invert Condition": 175,
"Remove Method Modifier": 174,
"Add Parameter Annotation": 168,
"Move Attribute": 155,
"Extract Attribute": 154,
"Add Variable Modifier": 148,
"Extract Class": 144,
"Remove Attribute Annotation": 142,
"Move And Rename Method": 133,
"Change Thrown Exception Type": 128,
"Move And Inline Method": 128,
"Push Down Method": 127,
"Remove Parameter Modifier": 109,
"Assert Throws": 105,
"Remove Parameter Annotation": 90,
"Replace Generic With Diamond": 90,
"Replace Attribute With Variable": 84,
"Move And Rename Class": 81,
"Move Source Folder": 81,
"Localize Parameter": 80,
"Merge Conditional": 80,
"Add Class Modifier": 71,
"Split Conditional": 70,
"Replace Anonymous With Lambda": 59,
"Remove Class Modifier": 57,
"Extract Superclass": 56,
"Remove Variable Modifier": 55,
"Extract Fixture": 52,
"Replace Conditional With Ternary": 48,
"Inline Attribute": 43,
"Modify Attribute Annotation": 41,
"Replace Anonymous With Class": 37,
"Try With Resources": 32,
"Change Type Declaration Kind": 31,
"Merge Parameter": 28,
"Push Down Attribute": 25,
"Extract Interface": 24,
"Parameterize Attribute": 23,
"Reorder Parameter": 23,
"Split Parameter": 20,
"Split Method": 16,
"Rename Package": 14,
"Merge Variable": 14,
"Move And Rename Attribute": 13,
"Extract Subclass": 12,
"Move Package": 11,
"Replace Loop With Pipeline": 10,
"Replace Pipeline With Loop": 10,
"Parameterize Test": 9,
"Remove Variable Annotation": 9,
"Merge Attribute": 9,
"Merge Catch": 9,
"Split Attribute": 8,
"Add Variable Annotation": 7,
"Modify Parameter Annotation": 6,
"Replace Conditional With Assumption": 6,
"Merge Class": 5,
"Replace Attribute": 5,
"Collapse Hierarchy": 4,
"Merge Method": 3,
"Split Class": 2,
"Split Variable": 1
}
## Detection
Mined using RefactoringMiner 3.1.3.
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