ExecutorType.VIRTUAL Doesn't Exist

Thu, 25 Jun 2026 00:00:00 +0000

Part 14 in the Memory Benchmark series.

The Config Everyone Writes

micronaut:
  executors:
    io:
      type: VIRTUAL

Every tutorial. Every “Micronaut + virtual threads” blog post. Every AI suggestion. This is the obvious config. One property, clean intent.

It crashes at startup:

No enum constant io.micronaut.scheduling.executor.ExecutorType.VIRTUAL

The Enum That Actually Exists

ExecutorType in Micronaut 5.0.0 has five values:

SCHEDULED
CACHED
FIXED
WORK_STEALING
THREAD_PER_TASK

No VIRTUAL. Never was one.

The Config That Works

micronaut:
  executors:
    io:
      type: THREAD_PER_TASK
      virtual: true

Two properties. type selects the executor creation strategy – THREAD_PER_TASK maps to Executors.newThreadPerTaskExecutor(factory). virtual sets that factory to produce virtual threads instead of platform threads.

Loom on tsvinc

ExecutorType.VIRTUAL Doesn't Exist

The Config Everyone Writes

The Enum That Actually Exists

The Config That Works