Order TaskExecutionAutoConfiguration before TaskSchedulerAutoConfiguration

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Background

Spring Boot 2.1 has introduced auto-configuration for task execution and scheduling with creation of a ThreadPoolTaskExecutor and ThreadPoolTaskScheduler bean if necessary. Both these classes share a common parent which led to a number of issues in the past.

Problem

ThreadPoolTaskExecutor is conditional on the absence of a java.util.concurrent.Executor. If TaskSchedulingAutoConfiguration runs before TaskExecutionAutoConfiguration, it may create a bean that implements Executor and therefore the task execution auto-configuration will back off unecessary.

Solution

There is no strict ordering between those two auto-configurations and things are working right now because the chosen order is so that TaskExecutionAutoConfiguration runs before TaskSchedulingAutoConfiguration. To make this explicit, we should order them explictly as well. The @AutoConfigureBefore or @AutoConfigureAfter annotation can be used for that purpose. Given that TaskSchedulingAutoConfiguration may be problematic here, it sounds more logical to use @AutoConfigureAfter on it and refer to TaskExecutionAutoConfiguration.

Steps to Fix

• Claim this issue with a comment below and ask any clarifying questions you need
• Set up a repository locally following the Contributing Guidelines
• Try to fix the issue following the steps above
• Commit your changes and start a pull request.

[ghost]

Hi @snicoll , seems this issue is closed. I am eagerly looking for opportunities to contribute to spring and open source projects. In future, how do I find this kind of issues for beginners like me to contribute to ?

@Omkar-Shetkar , you can head over to issues section of this repository and find issues with status first-timers-only to begin with. Remember to claim the issue before anyone else as soon as you decide to work on it.

[Omkar-Shetkar]

@isank Thanks.