How to keep context when creating new thread in spring?

Question

System.out.println(LocaleContextHolder.getLocale()); // zh
new Thread(() -> {
    System.out.println(LocaleContextHolder.getLocale()); // en_US
}).start();

From parent thread, I see that context locale is "zh" from child thread, I see "en_US". New thread is losing the context locale. Is there a way to pass context to new created thread?

https://stackoverflow.com/a/44033816/733345 has an example of this. — Joe, Feb 18 '20 at 11:32

score 2 · Accepted Answer · answered Feb 18 '20 at 11:33

According to the Javadocs

The LocaleContext will be inherited by any child threads spawned by the current thread if the inheritable flag is set to true.

This means locale can be set using the method setLocale(Locale locale, boolean inheritable) by passing inheritable as true. So before spawning a new child thread you can call setLocale with inheritable equals to true.

score 0 · Answer 2 · answered Dec 14 '22 at 10:50

use transmittable-thread-local,add dependence to your pom.xml

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>transmittable-thread-local</artifactId>
  <version>2.12.0</version>
</dependency>

convert you executorService like this

ExecutorService executorService = ...
executorService = TtlExecutors.getTtlExecutorService(executorService);

How to keep context when creating new thread in spring?

2 Answers2