Zero-config foreign keys
Auto-introspects DatabaseMetaData, builds the FK dependency graph, and
topologically orders the fill — parents before children, no configuration.
Bloviate
Auto-discovers your schema, respects foreign keys, and fills tables (or CSV/TSV files) with realistic, reproducible data. It never touches production data, is deterministic by seed, and runs inside your JUnit / Testcontainers pipeline.
Why Bloviate
Section titled “Why Bloviate”Privacy-safe by construction
Generated purely from schema and type. Production data is never read, so the GDPR/CCPA exposure surface is structurally minimal.
Deterministic by seed
The same seed and schema produce byte-identical data on every run — even under parallel and partitioned fills.
CI-native, dependency-free core
No cloud account, no Python/GPU runtime, no per-row pricing — just a library on your classpath, with first-class JUnit 5 and Testcontainers integrations.
Multi-database
PostgreSQL, MySQL, and CockroachDB today, with an extensible architecture for more — actively maintained and released.
Flat files too
Export generated data to CSV, TSV, and pipe-delimited files with full control over every column.
Generate from your schema, not from a copy of production
Section titled “Generate from your schema, not from a copy of production”Bloviate is an open-source, JDBC-native filler — it manufactures relational data from a schema. That’s a different job from the ML/privacy synthesizers (which learn from real data and are non-deterministic) and from masking/subsetting tools (which operate on existing production data). Among its peers, Bloviate is the maintained, deterministic, auto-FK option.
Realistic semantic values (emails, names, addresses), correlated columns, and CHECK/enum
conformance are all supported — as opt-in features layered on the fast, type-driven default rather
than replacing it.
Under the hood
Section titled “Under the hood”How Bloviate actually works, and how fast it runs — the deep technical material behind the library.
ArchitectureThe foreign-key dependency DAG and topological fill order, schema-identity seeding for reproducibility, parallel and partitioned fills, and the extension points — with diagrams.
BenchmarksHow Bloviate performs filling real benchmark schemas (TPC-C and friends), how the harness works, and how to run it yourself.
API reference
Section titled “API reference”The complete Javadoc for every public package is hosted right here — themed to match these docs, with its own per-class search.
API Reference overviewBrowse the API by package — core engine, database support, generators, file output, and the JUnit / Testcontainers / Datafaker integrations.
Full JavadocJump straight into the generated Javadoc for the whole public API.