This repository is to demonstrate how we can implement & test a custom data access library using Spring Boot Starter. You can find the following code examples here:
- servlet & reactive implementations of custom Spring Boot Data Access Library for MongoDB
- how to test the data access libraries using embedded database with TestContainers
For more information, refer to the medium article here!
gradle demo-mvc-mongodb-starter:test # Test the custom MongoDB Spring Boot Starter Library
gradle demo-reactive-mongodb-starter:test # Test the custom Reactive MongoDB Spring Boot Starter Library# Start a MongoDB Server
docker run -d -p 27017:27017 --name mongo-server -e MONGO_INITDB_ROOT_USERNAME=admin -e MONGO_INITDB_ROOT_PASSWORD=admin -e MONGO_INITDB_DATABASE=demoDB mongo:6.0.3
# Run the Demo Service
gradle demo-mvc-service:bootrun # Spring Web (MVC)
gradle demo-reactive-service:bootrun # Spring Webflux (Reactive)***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of constructor in com.example.data.features.demo.DemoDao
required a bean of type 'com.example.data.features.demo.DemoRepository'
that could not be found.
Action:
Consider defining a bean of type
'com.example.data.features.demo.DemoRepository' in your configuration.This probably occurs because the package name for the starter library is different from the Spring Boot application that
is consuming it. Eg. com.example.data vs com.example.app. To resolve it, ensure that in the auto-configuration class,
add @EnableMongoRepositories.
@Configuration
@EnableMongoRepositories(basePackages = ["com.example.data"])
@ComponentScan("com.example.data")
class MongoAutoConfigurationlateinit property demoDao has not been initialized
kotlin.UninitializedPropertyAccessException: lateinit property demoDao has not been initializedThis error occurs when you are running your test cases without @MongoSpringBootTest annotation as the test cases do not
know where the packages are found. Eg.
@Configuration
@ComponentScan("com.example.data")
class TestConfig***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of constructor in com.example.database.dao.DemoDao required a bean named 'mongoTemplate' that could not be found.
Action:
Consider defining a bean named 'mongoTemplate' in your configuration.This error occurs because the tests cases are not configured with relevant configurations for MongoDB tests. Make sure that
in your @MongoSpringBootTest, you add the annotation @AutoConfigureDataMongo. Eg.
@Target(AnnotationTarget.CLASS)
@SpringBootTest(classes = [TestConfig::class])
@ContextConfiguration(initializers = [MongoInitializer::class])
@AutoConfigureDataMongo
annotation class MongoSpringBootTest- https://nexocode.com/blog/posts/fast-stable-mongodb-tests-spring
- https://stackoverflow.com/questions/64991293/how-should-i-perform-integration-testing-on-a-springboot-library-that-isnt-an
- https://stackoverflow.com/questions/58175467/testing-spring-boot-library-modules
- https://reflectoring.io/spring-boot-test/
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