如何在 Spring 引导应用程序中禁用 MongoDB 在启动时建立连接？

Question

I've got a Spring Boot application that has two different database implementations, one is SQL, one is NO-SQL (MongoDB). The SQL implementation is default and I am not using currently the NO-SQL one. However, the application tries to connect to a MongoDB server and shows an error if one is not available.

I tried the following:

    SpringBootApplication(exclude = {
        MongoAutoConfiguration.class,
        MongoDataAutoConfiguration.class
    })

However, in this case I get the following error:

    Field operations in ...mongodb.CustomThingRepositoryImpl required a bean of type 'org.springframework.data.mongodb.core.MongoOperations' that could not be found.

The injection point has the following annotations:

        - @org.springframework.beans.factory.annotation.Autowired(required=true)
    
    Action:
    
    Consider defining a bean of type 'org.springframework.data.mongodb.core.MongoOperations' in your configuration.

My MongoDB Repository classes look as follows:

    public interface SpringDataMongoThingRepository extends MongoRepository<ThingDocument, String>,
            CustomThingRepository<ThingDocument, String> {
    }

    public interface CustomThingRepository<T, ID> {
    
        [...]
    
        <S extends T> S save(S entity);
    
        void deleteById(ID id);
    }

    @Component
    public class CustomThingRepositoryImpl<T, ID> implements CustomThingRepository<T, ID> {
    
        @Autowired
        private MongoOperations operations;
        
        @Autowired
        private ThingDataStorageProcessor thingDataStorageProcessor;
        [...]


    @Component
    public class ThingDataStorageProcessor {
    
        @Autowired
        private GridFsOperations gridFsOperations;
        [...]

I tried providing dummy implementations of MongoOperations and GridFsOperations but I still get an error:

    Description:
    
    A component required a bean named 'mongoTemplate' that could not be found.
    
    
    Action:
    
    Consider defining a bean named 'mongoTemplate' in your configuration.

How can I at least prevent MongoDB from connecting on startup?

Answer 1

This has worked for me:

@Repository
@ConditionalOnProperty(prefix = "spring.data.mongodb", name = "uri")
public interface SpringDataMongoThingRepository...