Incompatibilities During Spring Boot Upgrade from 2.0.x.RELEASE to 2.3.x.RELEASE

In earlier Spring Boot versions, Bean name can be overwritten. In new versions, this function is disabled by default and can be enabled by using the configuration item.

Configure the following to enable overwriting:

spring:
  main:    
    allow-bean-definition-overriding: true

The Spring Data API fluctuates.

In later versions, one entity corresponds to one table.

Currently, there is no solution. Alternatively, adjust the code structure to the constraints of the new version.

The MongoDbFactory API has changed and needs to be adjusted to the new version.

@Bean
public MappingMongoConverter mappingMongoConverter(MongoDbFactory factory, MongoMappingContext context, BeanFactory beanFactory) {
   DbRefResolver dbRefResolver = new DefaultDbRefResolver(factory);
   MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, context);
   mappingConverter.setCustomConversions(beanFactory.getBean(MongoCustomConversions.class));
   // other customization
   return mappingConverter;
}

@Bean
public MongoClientOptions mongoOptions() {
       return MongoClientOptions.builder().maxConnectionIdleTime(60000).socketTimeout(60000).build();   
}