Excessive amounts of SimpleAsyncTaskExecutor threads

Environment

• JBoss Enterprise Application Platform (EAP)
• Spring

Issue

• We are seeing an excessive amount of SimpleAsyncTaskExecutor threads at once in the JVM

Resolution

• Setting a concurrency limit in the spring layer for your async bean will cap the number of threads it can create to avoid such thread growth. The Content from docs.spring.io is not included.spring docs provide more of an overview on spring executor configurations for async beans.

Root Cause

• SimpleAsyncTaskExecutor creates a new thread for every async bean invocation so if these invocations slow and pile up, and unbounded amount of threads can pile up.

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