Metadata-driven application framework for building business software in Java.

For: Engineers building internal tools, admin panels, data management apps, or CRUD-heavy systems
Status: Stable (v0.27)

Building business applications means writing the same patterns repeatedly: table views, forms, CRUD operations, user permissions, reports, scheduled jobs. Most frameworks make you implement these from scratch.

QQQ takes a different approach. You define your data model and business rules through metadata, and QQQ generates the working application - complete with API, dashboard, and backend logic.

This isn't a no-code tool. You write Java when you need custom behavior. But the boilerplate - the 80% that's the same across every app - is handled for you.

• Metadata-driven tables - Define entities once, get API + UI + validation
• Backend modules - RDBMS, filesystem, MongoDB, S3 out of the box
• Business processes - Multi-step workflows with state management
• React dashboard - Material-UI admin interface, zero frontend code required
• Multiple interfaces - REST API, CLI, Lambda handlers from same codebase
• Extensible - Custom actions, widgets, and integrations when needed

Prerequisites: Java 17+, Maven 3.8+

<dependency>
    <groupId>com.kingsrook.qqq</groupId>
    <artifactId>qqq-backend-core</artifactId>
    <version>0.27.0</version>
</dependency>

<dependency>
    <groupId>com.kingsrook.qqq</groupId>
    <artifactId>qqq-backend-module-rdbms</artifactId>
    <version>0.27.0</version>
</dependency>

Define a table:

new QTableMetaData()
    .withName("order")
    .withBackendName("rdbms")
    .withPrimaryKeyField("id")
    .withField(new QFieldMetaData("id", QFieldType.INTEGER))
    .withField(new QFieldMetaData("customerId", QFieldType.INTEGER))
    .withField(new QFieldMetaData("status", QFieldType.STRING))
    .withField(new QFieldMetaData("total", QFieldType.DECIMAL));

QQQ generates: REST endpoints, dashboard screens, query capabilities, and validation.

<!-- PostgreSQL, MySQL, etc -->
<artifactId>qqq-backend-module-rdbms</artifactId>

<!-- Local/S3 file storage -->
<artifactId>qqq-backend-module-filesystem</artifactId>

<!-- MongoDB -->
<artifactId>qqq-backend-module-mongodb</artifactId>

<!-- HTTP server with REST API -->
<artifactId>qqq-middleware-javalin</artifactId>

<!-- CLI commands -->
<artifactId>qqq-middleware-picocli</artifactId>

<!-- AWS Lambda -->
<artifactId>qqq-middleware-lambda</artifactId>

See qqq-frontend-material-dashboard for the React admin UI.

Maturity: Stable, used in production systems
Breaking changes: Major versions may break API; see release notes

Roadmap:

• Java 21 migration
• Improved widget system
• Enhanced process tracing

git clone git@github.com:QRun-IO/qqq.git
cd qqq
mvn clean install

See Developer Onboarding and Contribution Guidelines.

Full documentation: QQQ Wiki

AGPL-3.0