How to call Spring MongoRepository from an ExecutorService

Wed, 29 Apr 2020 00:00:00 +0000

The problem

Recently I encountered an issue in code when I tried to call the Spring MongoRepository from a non-Spring-managed thread in a Java Spring Boot application. Here is a brief description of the issue.

The Repository interface

public interface ResponseRepository extends MongoRepository<Response, String> {

}

It’s a standard Spring Repository interface without any custom methods.

The calling class

@Component //A Spring Component
public class AnImaginaryComponent {

 @Autowired
 private ResponseRepository responseRepo;

 public void saveResponseInANewThread(Response r) {
 //Create an Executor service
 ExecutorService executor = Executors.newSingleThreadExecutor();

 //Submit a Runnable instance
 executor.submit(() -> responseRepo.save(r));
 }
}

When anImaginaryComponent.saveResponseInANewThread(r) is invoked, it never saves the r Response into the database. And the worst part is that it doesn’t throw any exceptions or print any log messages for the failure.

AMS: Data Provider Service - Generating performance metrics with Spring Boot Actuator

Sun, 15 Mar 2020 00:00:00 +0000

Introduction