2. Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. Thread: taskExecutor-8 running task 6. Spring’s TaskExecutor interface is identical to the java.util.concurrent.Executor interface. Cr e ate a sample Spring Boot project and add the ... to run @Async methods in a background thread pool. Thread: taskExecutor-3 running task 1. If you have questions about registering custom metrics, please follow-up on StackOverflow or come chat with the community on Gitter. Setting "queueCapacity" to 0 mimics Executors.newCachedThreadPool(), with immediate scaling of threads in the pool to a potentially very high number. So when there are lots of calls for B, the application can still handle service A in a different pool from B. I have service A(fast) and service B(slow). The @EnableAsync annotation switches on Spring’s ability to run @Async methods in a background thread pool. Thread: taskExecutor-10 running task 8. In spring we can directly inject ThreadPoolExecutor instance to our bean. It works in jdk1.5. It will search for TaskExecutor bean or a bean named as taskExecutor. 4. The default configuration is a core pool size of 1, with unlimited max pool size and unlimited queue capacity. ThreadPoolTaskExecutor belongs to the package org.springframework.scheduling.concurrent. 1.3 Thread pool consists of the following four basic components: ThreadPool Manager: Used to create and manage thread pools, including creating thread pools, destroying thread pools, and adding new tasks. Calls to execute will reuse previously constructed threads if available. The Spring Framework provides abstractions for asynchronous execution of tasks by using the TaskExecutor interface. In spring to provide ThreadPoolExecutor directly to bean, it has provided ThreadPoolTaskExecutor. These pools will typically improve the performance of programs that execute many short-lived asynchronous tasks. Consider also setting a "maxPoolSize" at that point, as well as possibly a higher "corePoolSize" (see also the "allowCoreThreadTimeOut" mode of scaling). Thread: taskExecutor-2 running task 3. How can I set different pool for them? I am now using @EnableAsync and @Async annotation to use multithreaded in Spring Boot. Spring Boot rather injects the component (i.e. The @EnableAsync annotation enables Spring's ability to run @Async methods in a background thread pool. Spring Framework makes it more easy with annotation @Async.In the How to start Spring Async with Spring Boot, JavaSampleApproach will guide you how to build asynchronized services with @Async & Spring Boot. This is roughly equivalent to java.util.concurrent.Executors#newSingleThreadExecutor(), sharing a single thread for all tasks. Here, the method is named taskExecutor , since this is the specific method name for which Spring searches . 3. This class also customizes the Executor by defining a new bean. 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