Spring Boot Tutorial
Learn Spring Boot with the following in-depth tutorials, covering from basic to advanced concepts such as packaging and monitoring.
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Tutorials
Test a Spring Boot REST Client with @RestClientTest
Use @RestClientTest and MockRestServiceServer to verify an outgoing Spring Boot 4 RestClient request, JSON mapping, and 404 handling with runnable tests.
Test a Spring Data JPA Repository with @DataJpaTest
Test Spring Data JPA repositories with @DataJpaTest on Spring Boot 4.1.2. Run H2 query tests, verify rollback behavior, and see how to keep a configured datasource.
Spring Boot @MockitoBean Example for Controller Tests
Use Spring Boot 4 @MockitoBean in MVC slice and full-context controller tests. Compare it with a plain Mockito mock and see when a missing bean is created or an existing one replaced.
Spring Boot @WebFluxTest and WebTestClient Example
Test a Spring WebFlux controller with @WebFluxTest, WebTestClient and @MockitoBean on Spring Boot 4.1.2. Verify JSON, 404 responses and the difference from a live-server test.
Spring Boot Integration Testing with @SpringBootTest and H2
Test a Spring Boot 4.1.2 REST API with @SpringBootTest and H2. Compare real HTTP and MockMvc tests, seed data with @Sql, and mock only the notification boundary.
Test a Spring Boot REST Controller with JUnit and Mockito
Test a Spring Boot REST controller with JUnit and Mockito. Compare direct method tests, standalone MockMvc and @WebMvcTest using verified GET, POST and 404 examples.
Spring Boot @TestConfiguration with Nested and Imported Examples
Use Spring Boot @TestConfiguration to add fixed test beans without losing production wiring. Compare nested and imported configurations in a runnable Boot 4.1.2 example.
Testing an Async Spring MVC Controller with MockMvc
Test asynchronous Spring MVC controllers with MockMvc and MockMvcTester. Run Spring Boot 4.1.2 examples for CompletableFuture, Callable, DeferredResult, and error responses.
Spring Boot Mockito JUnit Example: Unit Test a Service
Unit test a Spring Boot service with JUnit and Mockito. Mock the repository with @Mock, build the service with @InjectMocks, stub with when().thenReturn() and check calls with verify(). Also covers @MockitoBean in @SpringBootTest, thenThrow, ArgumentCaptor, BDDMockito, strict stubs and the Mockito Java agent on Java 21+.
Spring Boot MockMvc Example with @WebMvcTest and MockitoBean
Test Spring Boot REST controllers with MockMvc and @WebMvcTest. Replace the service with a @MockitoBean mock and send GET, POST, PUT and DELETE requests with JSON. Then check status codes, validation errors and @RestControllerAdvice responses. Also covers MockMvcTester (AssertJ) and real andDo(print()) output on Spring Boot 4.1.1.
Test a Spring Boot POST API with TestRestTemplate
Test a Spring Boot POST endpoint with TestRestTemplate on a random port. Verify 201, response body, Location, read-back GET and a 400 error response.