[Solved] What is wrong with this custom thread pool configuration in Spring Boot?@Bean public ThreadPoolTaskExecutor taskExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.... | Spring Boot

Spring Boot - Async Processing

What is wrong with this custom thread pool configuration in Spring Boot?

@Bean
public ThreadPoolTaskExecutor taskExecutor() {
  ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
  executor.setCorePoolSize(5);
  executor.setMaxPoolSize(3);
  executor.setQueueCapacity(10);
  executor.initialize();
  return executor;
}

AMissing @EnableAsync annotation on configuration class

BQueue capacity cannot be set in ThreadPoolTaskExecutor

CCore pool size is greater than max pool size, which is invalid

DThreadPoolTaskExecutor cannot be returned as a bean

Step-by-Step Solution

Solution:

Step 1: Check core and max pool size relationship
Core pool size must be less than or equal to max pool size; here core is 5 but max is 3, which is invalid.
Step 2: Validate other settings
Queue capacity is valid; @EnableAsync is optional but recommended; returning ThreadPoolTaskExecutor bean is correct.
Final Answer:
Core pool size is greater than max pool size, which is invalid -> Option C
Quick Check:
Core pool ≤ max pool required [OK]

Quick Trick: Core pool size must not exceed max pool size [OK]

Common Mistakes:

Setting core pool size larger than max pool size
Assuming queue capacity is mandatory to set
Forgetting to add @EnableAsync (not always required)

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More Spring Boot Quizzes

What is wrong with this custom thread pool configuration in Spring Boot?

Step 1: Check core and max pool size relationship

Step 2: Validate other settings

Final Answer:

Quick Check:

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