# Java virtual threads

> Waiting no longer holds a platform thread, so a slow database only adds latency. Native (JNI) calls still pin a carrier, and the JVM still warms for 30 s. Realtime connections cost 10 KB.

## Trade-offs

| Axis | Score |
| --- | --- |
| Throughput | |
| Tail latency | |
| Memory | |
| Velocity | |
| Resilience | |
| Operability | |

## Frameworks

- [Spring Boot](https://wiki.playquorum.dev/frameworks/spring-boot.md)
- [Quarkus](https://wiki.playquorum.dev/frameworks/quarkus.md)

## Engineering terms

- [Green threads](https://wiki.playquorum.dev/glossary/green-threads.md)
- [JIT warmup](https://wiki.playquorum.dev/glossary/jit-warmup.md)
- [GC pause](https://wiki.playquorum.dev/glossary/gc-pause.md)

## Facts

Java virtual threads
- **Language:** Java
- **Concurrency:** Green threads
- **Speed:** ×1.1
- **Memory:** 500 MB
- **Startup:** 20 s
- **Warm-up:** 30 s
- **GC pause:** 30 ms
- **Unlocked by:** [Java virtual threads](https://wiki.playquorum.dev/research/virtual-threads.md)
- **Velocity:** ×0.9
- **Salary:** ×1.05
- **Build:** 6 min

## See also

- [Runtimes and frameworks](https://wiki.playquorum.dev/runtimes.md)
- [Spring Boot](https://wiki.playquorum.dev/frameworks/spring-boot.md)
- [Quarkus](https://wiki.playquorum.dev/frameworks/quarkus.md)

Source: https://wiki.playquorum.dev/runtimes/java_virtual