# apache/jena

Apache Jena, A free and open source Java framework for building Semantic Web and Linked Data applications.

Repository: https://github.com/apache/jena
Canonical: https://ross.abutalabs.com/products/jena
Homepage: https://jena.apache.org/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: jena, apache, rdf, sparql
Last push: 2026-08-26T18:57:55+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 4989, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1417, forks 704 (observed 2026-08-28T04:04:39.988943+00:00)

## What it is
Apache Jena is a free and open-source Java framework for building Semantic Web and Linked Data applications. It provides an RDF API, a SPARQL 1.1 query engine (ARQ), a persistent triple store (TDB), a SPARQL server (Fuseki), and OWL/RDFS inference and ontology support.

## Use cases
- query RDF data with SPARQL
- store and persist RDF triples in a native triple store
- expose RDF data as a SPARQL endpoint over HTTP
- parse and serialize RDF in Turtle, JSON-LD, RDF/XML and other formats
- run OWL and RDFS reasoning over RDF graphs
- build linked data and semantic web applications in Java
- validate RDF data with SHACL
- run federated SPARQL queries across remote endpoints

## When to choose
- you need a mature, standards-compliant RDF/SPARQL toolkit on the JVM
- you want a self-contained SPARQL server with transactional persistent storage
- you need OWL/RDFS inference or SHACL validation for RDF data
- you work with linked data formats like Turtle, JSON-LD, or RDF/XML

## When to avoid
- your data is relational and does not fit the RDF graph model
- you need a lightweight embedded graph database without RDF/SPARQL semantics
- your stack is not JVM-based and you only need simple JSON or SQL storage

## Facets
- artifact type: framework
- maturity: stable
- function: database, search-engine, serialization, http-server, cli, parser, api-framework
- domain: databases, web-development, developer-tools, apis
- platform: jvm, cross-platform, cli
- tags: rdf, sparql, semantic-web, linked-data, triple-store, owl, fuseki, tdb, knowledge-graph, apache, search, web-server, docker

## Member repositories
- apache/jena (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:39.988943+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:38:00.304758+00:00, confidence not recorded.
  - readme: https://github.com/apache/jena (fetched 2026-08-28T04:04:39.988943+00:00, sha c0945ead2869)
  - homepage: https://jena.apache.org/ (fetched 2026-08-29T11:50:41.466174+00:00, sha 60843c4d2db0)
  - site_page: https://jena.apache.org/documentation/assembler/index.html (fetched 2026-08-29T11:50:41.480987+00:00, sha 4736566dc58b)
  - site_page: https://jena.apache.org/documentation/fuseki2/index.html (fetched 2026-08-29T11:50:41.470132+00:00, sha d43ac536e6c3)
  - site_page: https://jena.apache.org/documentation/notes/index.html (fetched 2026-08-29T11:50:41.472217+00:00, sha 7105c4b45e91)
  - site_page: https://jena.apache.org/documentation/query/manipulating_sparql_using_arq.html (fetched 2026-08-29T11:50:41.474134+00:00, sha 2d632a8ac244)
  - site_page: https://jena.apache.org/documentation/index.html (fetched 2026-08-29T11:50:41.476139+00:00, sha 4a2752dee4e5)
  - site_page: https://jena.apache.org/documentation/query/index.html (fetched 2026-08-29T11:50:41.477799+00:00, sha 0ec58093abd2)
  - site_page: https://jena.apache.org/documentation/io (fetched 2026-08-29T11:50:41.479340+00:00, sha 6a572c170628)
  - site_page: https://jena.apache.org/documentation/tools/index.html (fetched 2026-08-29T11:50:41.482866+00:00, sha ce5d6c5acc9b)
- Data as of 2026-08-30T08:39:29.467469+00:00.