Issue
I want spring to load the default ThreadPoolTaskExecutor from TaskExecutionAutoConfiguration. Though I want to provide may own additional executor for some explicit side-tasks:
@Bean
public ThreadPoolExecutor myRequestPool() {
return (ThreadPoolExecutor) Executors.newFixedThreadPool(10);
}
Problem: adding the bean above, the TaskExecutionAutoConfiguration will not be executed anymore, and the spring-default executor will not be initialized, because @ConditionalOnMissingBean(Executor.class) does not match anymore:
package org.springframework.boot.autoconfigure.task;
public class TaskExecutionAutoConfiguration {
@Lazy
@Bean(name = APPLICATION_TASK_EXECUTOR_BEAN_NAME)
@ConditionalOnMissingBean(Executor.class)
public ThreadPoolTaskExecutor applicationTaskExecutor(TaskExecutorBuilder builder) {
return builder.build();
}
Question: how can I still let spring create both beans?
Solution
Important: Without the following "hack", Springs default behavior here is to simply hard replace the default executor with your custom one. And as a result, also execute any normal @Async methods with your custom executor. This may mostly have undesired results.
The solution is to provide the default applicationTaskExecutor explicit, like in TaskExecutionAutoConfiguration. But without the @ConditionalOnMissingBean annotation, as follows:
@Configuration
public class AppConfig {
@Lazy
@Bean(name = { TaskExecutionAutoConfiguration.APPLICATION_TASK_EXECUTOR_BEAN_NAME,
AsyncAnnotationBeanPostProcessor.DEFAULT_TASK_EXECUTOR_BEAN_NAME })
public ThreadPoolTaskExecutor applicationTaskExecutor(TaskExecutorBuilder builder) {
return builder.build();
}
}
This way, the default executor is always loaded, and additional custom executors can be added to the application without replacing it (which is the default behavior).
As a result, all @Async methods will still execute with the default applicationTaskExecutor, and all @Async("customExecutor") will use your custom one.
Answered By - membersound
Answer Checked By - Mary Flores (JavaFixing Volunteer)
