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Java

4 production projects and 0 rule sets built with Java.

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Production projects

Time-Series SQL Database Classic QuestDB Combining a zero-GC Java engine with C++/Rust vector acceleration gives QuestDB ultra-low latency ingestion and microsecond SQL queries over billions of metrics.
Declarative Orchestration & Data Flow Engine Classic Kestra Queueing and repository storage run through the same JDBC layer instead of a dedicated broker, so one PostgreSQL (or MySQL/H2) instance is enough to run the scheduler, executor, and worker modules together, while those modules stay separately buildable and scalable.
Low-Code Internal Tool Platform Classic Appsmith A reactive Spring Boot server with PF4J plugins isolates dozens of datasource integrations, MongoDB stores app definitions as documents, and a single supervisord-managed image keeps self-hosting to one container.
Business Intelligence Platform Classic Metabase Shipping the backend as one Clojure uberjar behind a bare JVM Docker image keeps self-hosting to a single artifact and runtime, while splitting SQL-dialect transform logic into a separate Python package lets that feature reuse an existing SQL-transpilation library instead of reimplementing it in Clojure.

Often used with Java

Questions about Java

How many production projects use Java?

4 verified production projects in the STACK IT FAST directory use Java, each with a full architecture breakdown.

What is Java most often used with?

Across projects in the directory, Java is most commonly paired with Docker, PostgreSQL, TypeScript.