Unable to autowire dozer Mapper in component class in spring boot - spring

Question

I am new to Spring Boot. I was trying to develop small application in spring boot mvc with neo4j database. Following is my Server
#Configuration
#ComponentScan({ "myproject" })
#EnableAutoConfiguration
#EnableNeo4jRepositories(basePackages = "myproject")
public class Server extends Neo4jConfiguration implements CommandLineRunner
{
public Server()
{
setBasePackage("myproject");
}
#Bean
SpringRestGraphDatabase graphDatabaseService()
{
return new SpringRestGraphDatabase("http://localhost:7474/db/data");
}
#Bean
Mapper mapper()
{
return new DozerBeanMapper();
}
public void run(String... args) throws Exception
{
}
public static void main(String[] args) throws Exception
{
SpringApplication.run(Server.class, args);
}
}
Following is my main class
#Configuration
#ComponentScan({ "myproject.business" })
#EnableNeo4jRepositories(basePackages = "myproject")
public class MainWithStructure extends Neo4jConfiguration implements CommandLineRunner
{
#Autowired
private MyService myService;
public MainWithStructure()
{
setBasePackage("myproject");
}
#Bean
SpringRestGraphDatabase graphDatabaseService()
{
return new SpringRestGraphDatabase("http://localhost:7474/db/data");
}
.......
......
public static void main(String[] args) throws Exception
{
FileUtils.deleteRecursively(new File("accessingdataneo4j.db"));
SpringApplication app = new SpringApplication(MainWithStructure.class);
app.setWebEnvironment(false);
app.run(args);
}
}
Following is my Component class
#Component
public class MyService
{
#Autowired
private Mapper mapper; //Fails to autowire org.dozer.Mapper
.....
}
Following is my Controller class
#RestController
#RequestMapping("/rest")
public class MyController
{
#Autowired
private Mapper mapper; //autowire sucess org.dozer.Mapper
}
I got following Exception when I run main class MainWithStructure
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mainWithStructure': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private myproject.business.MyService myproject.main.MainWithStructure.MyService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.dozer.Mapper myproject.business.MyService.mapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.dozer.Mapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
Following is my project structure
demo_project
src/main/java
---myproject.main
------MainWithStructure.java
------Server.java
---myproject.business
------MyService.java
---myproject.rest
------MyController.java
If I autowire org.dozer.Mapper in Controller, it sucessfuly autowired it. BUT if I autowire org.dozer.Mapper in Component class it fails to autowire.
Why it is failing to autowire org.dozer.Mapper only on Component class?
Please make me correct if I wrong. Thank you :)

Answer 1

Your Server is not in one of the packages that you #ComponentScan, so the Mapper is indeed not a bean. Try removing the explicit package from the #ComponentScan (since everything is in a subpackage of the main class that will pick up all the components).

Answer 2

You can add #SpringBootApplication in your main class which has #ComponentScan
which will scan all your sub components in project.