eclipse 2020-12 svn
For later versions:
Try adding All the following, In my application it is working fine with tomcat
@EnableJpaRepositories("my.package.base.*") @ComponentScan(basePackages = { "my.package.base.*" }) @EntityScan("my.package.base.*")I am using spring boot, and when i am using embedded tomcat it was working fine with out
@EntityScan("my.package.base.*")but when I tried to deploy the app to an external tomcat I gotnot a managed typeerror for my entity.
@RunWith(SpringRunner.class)tells JUnit to run using Spring’s testing support.SpringRunneris the new name forSpringJUnit4ClassRunner, it’s just a bit easier on the eye.
SpringRunneris only available on spring-test 4.3.
SpringRunnerclass extendsSpringJUnit4ClassRunner.Source code of
SpringRunnerispackage org.springframework.test.context.junit4; import org.junit.runners.model.InitializationError; public final class SpringRunner extends SpringJUnit4ClassRunner { public SpringRunner(Class<?> clazz) throws InitializationError { super(clazz); } }
The two approaches are different, one is inheritance, and the other one is a simple dependency.
By dependency you'll only have the binary transitive dependencies of the project B.
By using as a parent project you'll inherit the configurations like plugins, building model, repositories, dependency-management, dependencies and so on, it depends on the case.
My rule of thumb is for scm configuration, project configuration, and development or company standards, I use a parent project (inheritance).
@SpringBootTestloads full application context, exactly like how you start a Spring container when you run your Spring Boot application.
@WebMvcTestloads only the web layer, which includes security, filter, interceptors, etc for handling request/response. Typically you would write tests for methods under@Controlleror@RestController.
@DataJpaTestloads only configuration for JPA. It uses an embedded in-memory h2 if not specified otherwise.Service layer tests should ideally not have any annotations (except for ones that aid in mocking) because this is where your business logic (independent of any configurations) sits.
Regarding best practice, it's really just separation of concerns. I rarely ever used
@SpringBootTestunless it's meant for some ad-hoc integration test on my local. Annotations like@WebMvcTestkeep your tests more 'modularized' and slightly faster.
4. Migrating from a JUnit4-Based Runner
Let's now migrate a test that uses a JUnit4-based runner to JUnit5.
We're going to use a Spring test as an example:
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = { SpringTestConfiguration.class }) public class GreetingsSpringTest { // ... }If we want to migrate this test to JUnit5 we need to replace the @RunWith annotation with the new @ExtendWith:
@ExtendWith(SpringExtension.class) @ContextConfiguration(classes = { SpringTestConfiguration.class }) public class GreetingsSpringTest { // ... }The SpringExtension class is provided by Spring 5 and integrates the Spring TestContext Framework into JUnit 5. The @ExtendWith annotation accepts any class that implements the Extension interface.
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit VintageThe JUnit Platform serves as a foundation for launching testing frameworks on the JVM. It also defines the
TestEngineAPI for developing a testing framework that runs on the platform. Furthermore, the platform provides a Console Launcher to launch the platform from the command line and a JUnit 4 based Runner for running anyTestEngineon the platform in a JUnit 4 based environment. First-class support for the JUnit Platform also exists in popular IDEs (see IntelliJ IDEA, Eclipse, NetBeans, and Visual Studio Code) and build tools (see Gradle, Maven, and Ant).JUnit Jupiter is the combination of the new programming model and extension model for writing tests and extensions in JUnit 5. The Jupiter sub-project provides a
TestEnginefor running Jupiter based tests on the platform.JUnit Vintage provides a
TestEnginefor running JUnit 3 and JUnit 4 based tests on the platform.
Video Briefing
You only need the launcher when you want to start a JUnit platform run programmatically, i.e. outside an IDE, build tool or console runner.In other words: the launcher is the API being used by IDEs and build tools
private static final ObjectMapper jsonMapper = new ObjectMapper();Constructing an
ObjectMapperinstance is a relatively expensive operation, so it's recommended to create one object and reuse it. You did it right making itfinal.// Suggestion 1: public static <T> T toObject1(final Class<T> type, final String json) throws IOException { return jsonMapper.readValue(json, type); }You always read JSON to a POJO, so let's be precise and clear, and use
ObjectReader.// Suggestion 2: public static <T> T toObject2(final Class<T> type, final String json) throws IOException { return jsonMapper.readerFor(type).readValue(json); } // Suggestion 3: public static <T> T toObject3(final Class<T> type, final String json) throws IOException { return jsonReader.forType(type).readValue(json); }There is no difference, really. Both methods will construct a new
ObjectReaderobject: the former (jsonMapper.readerFor(type)) will give you a fully-built instance directly, the latter (jsonReader.forType(type)) will complement the not-yet-usablejsonReaderand returns a ready-to-use object. I would rather go with option 2 because I don't want to keep that field.You shouldn't worry about performance or thread-safety. Even though creating an
ObjectMappermight be costly (or making a copy out of it), getting and working withObjectReaders is lightweight and completely thread-safe.From the Java documentation (emphasis mine):
Uses "mutant factory" pattern so that instances are immutable (and thus fully thread-safe with no external synchronization); new instances are constructed for different configurations. Instances are initially constructed by
ObjectMapperand can be reused, shared, cached; both because of thread-safety and because instances are relatively light-weight.I recently had these questions myself and decided on
ObjectMapper#reader(InjectableValues)as a factory method. It's very handy particularly when you want to customise anObjectReaderslightly or, as it was in my case, to adjust aDeserializationContext.That's an excellent question, by the way.