Duplicate Key Error on saving Reactor Mongo result - spring

Question

I'm seeing the following error when attempting to query and update some records to MongoDB using reactive streams:
org.springframework.dao.DuplicateKeyException: E11000 duplicate key error collection: testtrans.submission index: _id_ dup key: { _id: ObjectId('600b10b2fbac4f4483af3e67') }; nested exception is com.mongodb.MongoWriteException
I'm not sure what I'm doing wrong; How do I go about querying and saving results to the database using reactive mongo in a single transaction?
My service class:
package com.example.reactivemongotransaction.service;
import com.example.reactivemongotransaction.dto.Submission;
import com.example.reactivemongotransaction.repository.SubmissionRepository;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
#Slf4j
#Service
public class SubmissionService {
#Autowired
private SubmissionRepository submissionRepository;
public Mono<Submission> saveSubmission(Submission submission) {
log.debug("saving {}", submission);
return submissionRepository.save(submission);
}
#Transactional
public Flux<Submission> lockSubmissions() {
log.debug("setting all locked");
Flux<Submission> submissionFlux = submissionRepository.findAllByLockedFalse();
return submissionFlux
.map(submission -> submission.setLocked(true))
.flatMap(submission -> submissionRepository.save(submission));
}
}
My config:
#Configuration
#EnableMongoAuditing
#EnableTransactionManagement
public class MongoConfiguration {
#Bean
public ReactiveTransactionManager transactionManager(ReactiveMongoDatabaseFactory dbFactory) {
return new ReactiveMongoTransactionManager(dbFactory);
}
}
Controller:
#RestController
#RequestMapping("/submissions")
public class SubmissionController {
#Autowired
private SubmissionService submissionService;
#PostMapping
public Mono<Submission> saveSubmission(final #RequestBody Submission submission) {
return submissionService.saveSubmission(submission);
}
#GetMapping("/lockall")
public Flux<Submission> lockAll() {
return submissionService.lockSubmissions();
}
}
Model:
#ToString
#Getter
#Setter
#Accessors(chain = true)
#Document(collection = "submission")
#TypeAlias("payload")
public class Submission implements Persistable<String> {
#Id
private String id;
#Field("role_name")
#Indexed(unique = true)
private String role;
#CreatedDate
private ZonedDateTime created;
#LastModifiedDate
private ZonedDateTime updated;
private Boolean deleted;
private Boolean enabled;
private boolean locked;
#Override
#JsonIgnore
public boolean isNew() {
if(getCreated() == null)
return true;
else
return false;
}
}
Repository:
public interface SubmissionRepository extends ReactiveMongoRepository<Submission, String> {
Flux<Submission> findAllByLockedFalse();
}
Main class:
#EnableReactiveMongoRepositories
#SpringBootApplication
public class ReactivemongotransactionApplication {
public static void main(String[] args) {
SpringApplication.run(ReactivemongotransactionApplication.class, args);
}
}
application.yml:
spring:
data:
mongodb:
uri: 'mongodb://localhost:27017/testtrans'
server:
port: 8280
Maven pom:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>reactivemongotransaction</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>reactivemongotransaction</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<lombok.version>1.18.6</lombok.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
My request is GET http://localhost:8280/submissions/lockall which return 500. And the logs show errors e.g.:
com.mongodb.MongoWriteException: E11000 duplicate key error collection: testtrans.submission index: _id_ dup key: { _id: ObjectId('600b10b2fbac4f4483af3e67') }
at com.mongodb.internal.async.client.AsyncMongoCollectionImpl.lambda$executeSingleWriteRequest$9(AsyncMongoCollectionImpl.java:1075) ~[mongodb-driver-core-4.1.1.jar:na]

Answer 1

The issue was related to the #CreatedDate not being set (see #EnableMongoAuditing and #CreatedDate Auditing not working in Spring Boot 2.4.3).
Resolved by reverting spring-boot-starter-parent to 2.3.5.RELEASE.