{"adoption": {"forks": 216, "observed_at": "2026-08-28T04:03:45.971456+00:00", "stars": 1147}, "canonical_url": "https://ross.abutalabs.com/products/jbox2d", "card": {"archived": false, "artifact_type": "library", "description": "a 2d Java physics engine, native java port of the C++ physics engines Box2D and LiquidFun ", "domain": ["simulation", "graphics"], "enriched": true, "function": ["simulation", "graphics", "game-engine", "serialization"], "health_score": 20, "homepage": "http://www.jbox2d.org", "language": "Java", "license": "BSD-2-Clause", "license_family": "permissive", "maturity": "maintenance", "member_repos": ["jbox2d/jbox2d"], "name": "jbox2d/jbox2d", "platform": ["jvm", "cross-platform", "browser"], "pushed_at": "2024-09-19T18:39:46+00:00", "repo": "jbox2d/jbox2d", "stars": 1147, "tags": ["physics-engine", "box2d", "liquidfun", "rigid-body-physics", "particle-simulation", "gwt", "collision-detection", "game-development"], "topics": [], "urls": [], "use_cases": ["simulate 2d rigid body physics in a java game", "add gravity and collision detection to a jvm application", "run liquid particle fluid simulation in java", "port box2d physics to android or gwt web", "test 2d physics scenarios with a testbed framework"], "what_it_is": "JBox2d is a native Java port of the C++ Box2D and LiquidFun 2D physics engines, providing rigid body simulation, joints, continuous collision detection, and LiquidFun particle physics. It includes a serialization module and a testbed framework for running physics demos.", "when_to_avoid": ["you need 3D physics", "you need cutting-edge performance or active feature development", "you're not on the JVM"], "when_to_choose": ["you need a mature, permissively licensed 2D physics engine on the JVM", "you want Box2D/LiquidFun behavior with Java-native code", "you're targeting Android, desktop, or browser (via GWT/TeaVM) with Java"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/jbox2d", "repo": "jbox2d/jbox2d", "role": "main", "score": 32}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:03:45.971456+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T06:34:02.633610+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "4b2c907181dd024261a81a0d267fb535cc5c0e4f75aa3a2c2ed1c7715da70c11", "fetched_at": "2026-08-28T04:03:45.971456+00:00", "kind": "readme", "missing": false, "url": "https://github.com/jbox2d/jbox2d"}, {"content_hash": "e5ccabe463093f4ab628a3e62e426b6442de3a9aeb9e6393e90a25004643694b", "fetched_at": "2026-08-29T12:39:14.261991+00:00", "kind": "homepage", "missing": false, "url": "http://www.jbox2d.org"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 0, "longevity": 100, "rhythm": 35}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": ["no_releases"], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4623, "days_push": 713, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 32, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}