Unsatisfied dependency expressed through field - Springboot the Application, the component and the test class are all in the same package - spring-boot

Question

My understanding is that the SpringBootApplication annotation includes
ComponentScan
https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-using-springbootapplication-annotation.html
The bean is discovered and printed in Application.main(), why does the unit test not find it?
This unit test fails with:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.pds.pdssr.etlfile.EtlFileServicesTest': Unsatisfied dependency expressed through field 'etlFileServices'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.pds.pdssr.etlfile.EtlFileServices' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
With the appropriate level of debug, i.e "org.springframework.context.annotation"="debug" I can see that the bean was discovered during component scanning.
Nevertheless, the unit test results in:
[ERROR] getAll(com.pds.pdssr.etlfile.EtlFileServicesTest) Time elapsed: 0.007 s <<< ERROR!
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.pds.pdssr.etlfile.EtlFileServicesTest': Unsatisfied dependency expressed through field 'etlFileServices'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.pds.pdssr.etlfile.EtlFileServices' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.pds.pdssr.etlfile.EtlFileServices' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
The Application:
package com.pds.pdssr.bootstrap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
//#EnableJpaRepositories("com.pds.pdsssr.jpa")
#SpringBootApplication
// #EntityScan("com.pds.pdssr.models")
public class Application {
private static final Logger logger = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) {
ApplicationContext applicationContext = SpringApplication.run(Application.class, args);
for (String name : applicationContext.getBeanDefinitionNames()) {
logger.info("bean: " + name);
}
}
}
The Component:
package com.pds.pdssr.bootstrap;
import java.util.List;
import javax.persistence.EntityManagerFactory;
import javax.transaction.Transactional;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import com.pds.pdssr.models.EtlFile;
#Repository
public class EtlFileServices {
#Autowired
private static EntityManagerFactory entityManagerFactory;
public SessionFactory getSessionFactory() {
SessionFactory sessionFactory = null;
if (entityManagerFactory == null) {
throw new IllegalStateException("entityManagerFactory is null");
}
sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
if (sessionFactory == null) {
throw new NullPointerException("factory is not a hibernate factory");
}
return sessionFactory;
}
#SuppressWarnings("unchecked")
public List<EtlFile> getAll() {
return getAll("etlFile",getSessionFactory().getCurrentSession());
}
#SuppressWarnings("rawtypes")
protected List getAll(String tableName, Session session) {
String queryText = "from " + tableName;
return getList(tableName, queryText, session);
}
#SuppressWarnings("rawtypes")
protected List getList(String tableName, String queryText, Session session) {
long start = System.nanoTime();
Query query = session.createQuery(queryText);
List result = query.list();
long end = System.nanoTime();
long millis = (end - start) / 1000000;
//logger.debug("table: " + tableName + " millis " + millis + " rows: " + result.size());
return result;
}
}
The test class:
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.junit4.SpringRunner;
import com.pds.pdssr.bootstrap.EtlFileServices;
import com.pds.pdssr.models.EtlFile;
#RunWith(SpringRunner.class)
public class EtlFileServicesTest {
#Autowired
private EtlFileServices etlFileServices;
#Test
public void getAll() {
List<EtlFile> etlFiles = etlFileServices.getAll();
assertNotNull(etlFiles);
}
}

Answer 1

Original answer:
You need to have
#RunWith(SpringRunner.class)
#SpringBootTest(classes = YourMainClass.class)
in your test class(es).
Further answer based on comment
If you really want to have SessionFactory in your project, you need to tell spring framework to have SessionContext explicitly. It can be done by add
spring.jpa.properties.hibernate.current_session_context_class = org.springframework.orm.hibernate5.SpringSessionContext
to your configuration file. Here's a working example for your problem.
HTH