Springboot Junit test NoClassDefFoundError EntityManagerFactoryBuilderImpl - spring-boot

Question

I created a springboot (2) webflux project as follow :
JPA Entity
#Entity
#Table(name = "users")
public class User implements Serializable
{
...
}
Spring repository
public interface UserRepository extends CrudRepository<User, Long>
{
}
Service
#Service
public class UserService
{
#Autowired
private UserRepository userRepo;
...
}
Webflux Handler
#Component
public class UserHandler
{
#Autowired
private UserService userService;
public Mono<ServerResponse> getUser(ServerRequest request)
{
...
}
}
RouteConfiguration
#Configuration
public class RouteConfiguration
{
#Bean
public static RouterFunction<ServerResponse> userRoutes(UserHandler userHandler)
{
return RouterFunctions.route(RequestPredicates.GET("/user"), userHandler:: getUser);
}
WebApp
#SpringBootApplication
public class WebApplication
{
public static void main(String[] args)
{
SpringApplication.run(WebApplication.class);
}
}
POM
<dependencies>
<!-- Compile -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
<!-- Provided -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<!-- Runtime -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<!-- Test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
Everything run fine, I can start my server and use it. I would like now to code some tests. Here is what I did :
#RunWith(SpringRunner.class)
#ContextConfiguration(classes = WebApplication.class)
public class UserHandlerTest
{
#Autowired
private ApplicationContext context;
#MockBean
private UserService userService;
private WebTestClient testClient;
#Before
public void setUp()
{
testClient = WebTestClient.bindToApplicationContext(context).build();
}
#Test
public void testUser()
{
...
}
}
What ever I tried, I got an error with hibernate dependencies during "mvn clean install" process :
[ERROR] testUser(...UserHandlerTest) Time elapsed: 0 s <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl
I know JPA works in blocking way but I want to avoid to use NoSQL DB for this project. Did I miss something ? Thank you a lot for help !

Answer 1

Probably, you are missing details which we need to provide for datasource under src/main/resources. you can check https://github.com/hantsy/spring-reactive-sample/blob/master/boot-data-mongo/src/main/resources/application.yml. this might help you.

Answer 2

To test my Spring Webflux controllers, I finally use the WebFluxTest annotation. It works as expected :
#RunWith(SpringRunner.class)
#ContextConfiguration(classes = {RouteConfiguration.class, UserHandler.class})
#WebFluxTest
public class UserHandlerTest
{
#Autowired
private ApplicationContext context;
#MockBean(name="userService")
private UserService userService;
private WebTestClient testClient;
#Before
public void setUp()
{
testClient = WebTestClient.bindToApplicationContext(context).build();
}
...
As I do not use RestController annotation but functional endpoints I had to use ContextConfiguration and manually instantiate the WebTestClient.