What Is a Nosuchbeandefinitionexception and How to Fix It

What is a NoSuchBeanDefinitionException and how do I fix it?

The javadoc of NoSuchBeanDefinitionException explains

Exception thrown when a BeanFactory is asked for a bean instance for
which it cannot find a definition. This may point to a non-existing
bean, a non-unique bean, or a manually registered singleton instance
without an associated bean definition.

A BeanFactory is basically the abstraction representing Spring's Inversion of Control container. It exposes beans internally and externally, to your application. When it cannot find or retrieve these beans, it throws a NoSuchBeanDefinitionException.

Below are simple reasons why a BeanFactory (or related classes) would not be able to find a bean and how you can make sure it does.

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The bean doesn't exist, it wasn't registered

In the example below

@Configuration
public class Example {
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Example.class);
        ctx.getBean(Foo.class);
    }
}

class Foo {}   

we haven't registered a bean definition for the type Foo either through a @Bean method, @Component scanning, an XML definition, or any other way. The BeanFactory managed by the AnnotationConfigApplicationContext therefore has no indication of where to get the bean requested by getBean(Foo.class). The snippet above throws

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException:
    No qualifying bean of type [com.example.Foo] is defined

Similarly, the exception could have been thrown while trying to satisfy an @Autowired dependency. For example,

@Configuration
@ComponentScan
public class Example {
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Example.class);
    }
}

@Component
class Foo { @Autowired Bar bar; }
class Bar { }

Here, a bean definition is registered for Foo through @ComponentScan. But Spring knows nothing of Bar. It therefore fails to find a corresponding bean while trying to autowire the bar field of the Foo bean instance. It throws (nested inside a UnsatisfiedDependencyException)

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: 
    No qualifying bean of type [com.example.Bar] found for dependency [com.example.Bar]: 
        expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

There are multiple ways to register bean definitions.

• @Bean method in a @Configuration class or <bean> in XML configuration
• @Component (and its meta-annotations, eg. @Repository) through @ComponentScan or <context:component-scan ... /> in XML
• Manually through GenericApplicationContext#registerBeanDefinition
• Manually through BeanDefinitionRegistryPostProcessor

...and more.

Make sure the beans you expect are properly registered.

A common error is to register beans multiple times, ie. mixing the options above for the same type. For example, I might have

@Component
public class Foo {}

and an XML configuration with

<context:component-scan base-packages="com.example" />
<bean name="eg-different-name" class="com.example.Foo />

Such a configuration would register two beans of type Foo, one with name foo and another with name eg-different-name. Make sure you're not accidentally registering more beans than you wanted. Which leads us to...

If you're using both XML and annotation-based configurations, make sure you import one from the other. XML provides

<import resource=""/>

while Java provides the @ImportResource annotation.

Expected single matching bean, but found 2 (or more)

There are times when you need multiple beans for the same type (or interface). For example, your application may use two databases, a MySQL instance and an Oracle one. In such a case, you'd have two DataSource beans to manage connections to each one. For (simplified) example, the following

@Configuration
public class Example {
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Example.class);
        System.out.println(ctx.getBean(DataSource.class));
    }
    @Bean(name = "mysql")
    public DataSource mysql() { return new MySQL(); }
    @Bean(name = "oracle")
    public DataSource oracle() { return new Oracle(); }
}
interface DataSource{}
class MySQL implements DataSource {}
class Oracle implements DataSource {}

throws

Exception in thread "main" org.springframework.beans.factory.NoUniqueBeanDefinitionException: 
    No qualifying bean of type [com.example.DataSource] is defined:
        expected single matching bean but found 2: oracle,mysql

because both beans registered through @Bean methods satisfied the requirement of BeanFactory#getBean(Class), ie. they both implement DataSource. In this example, Spring has no mechanism to differentiate or prioritize between the two. But such mechanisms exists.

You could use @Primary (and its equivalent in XML) as described in the documentation and in this post. With this change

@Bean(name = "mysql")
@Primary
public DataSource mysql() { return new MySQL(); } 

the previous snippet would not throw the exception and would instead return the mysql bean.

You can also use @Qualifier (and its equivalent in XML) to have more control over the bean selection process, as described in the documentation. While @Autowired is primarily used to autowire by type, @Qualifier lets you autowire by name. For example,

@Bean(name = "mysql")
@Qualifier(value = "main")
public DataSource mysql() { return new MySQL(); }

could now be injected as

@Qualifier("main") // or @Qualifier("mysql"), to use the bean name
private DataSource dataSource;

without issue. @Resource is also an option.

Using wrong bean name

Just as there are multiple ways to register beans, there are also multiple ways to name them.

@Bean has name

The name of this bean, or if plural, aliases for this bean. If left
unspecified the name of the bean is the name of the annotated method.
If specified, the method name is ignored.

<bean> has the id attribute to represent the unique identifier for a bean and name can be used to create one or more aliases illegal in an (XML) id.

@Component and its meta annotations have value

The value may indicate a suggestion for a logical component name, to
be turned into a Spring bean in case of an autodetected component.

If that's left unspecified, a bean name is automatically generated for the annotated type, typically the lower camel case version of the type name. For example MyClassName becomes myClassName as its bean name. Bean names are case sensitive. Also note that wrong names/capitalization typically occur in beans referred to by string like @DependsOn("my BeanName") or XML config files.

@Qualifier, as mentioned earlier, lets you add more aliases to a bean.

Make sure you use the right name when referring to a bean.

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More advanced cases

Profiles

Bean definition profiles allow you to register beans conditionally. @Profile, specifically,

Indicates that a component is eligible for registration when one or
more specified profiles are active.

A profile is a named logical grouping that may be activated
programmatically via
ConfigurableEnvironment.setActiveProfiles(java.lang.String...) or
declaratively by setting the spring.profiles.active property as a JVM
system property, as an environment variable, or as a Servlet context
parameter in web.xml for web applications. Profiles may also be
activated declaratively in integration tests via the @ActiveProfiles
annotation.

Consider this examples where the spring.profiles.active property is not set.

@Configuration
@ComponentScan
public class Example {
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Example.class);
        System.out.println(Arrays.toString(ctx.getEnvironment().getActiveProfiles()));
        System.out.println(ctx.getBean(Foo.class));
    }
}

@Profile(value = "StackOverflow")
@Component
class Foo {
}

This will show no active profiles and throw a NoSuchBeanDefinitionException for a Foo bean. Since the StackOverflow profile wasn't active, the bean wasn't registered.

Instead, if I initialize the ApplicationContext while registering the appropriate profile

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
ctx.getEnvironment().setActiveProfiles("StackOverflow");
ctx.register(Example.class);
ctx.refresh();

the bean is registered and can be returned/injected.

AOP Proxies

Spring uses AOP proxies a lot to implement advanced behavior. Some examples include:

• Transaction management with @Transactional
• Caching with @Cacheable
• Scheduling and asynchronous execution with @Async and @Scheduled

To achieve this, Spring has two options:

1. Use the JDK's Proxy class to create an instance of a dynamic class at runtime which only implements your bean's interfaces and delegates all method invocations to an actual bean instance.
2. Use CGLIB proxies to create an instance of a dynamic class at runtime which implements both interfaces and concrete types of your target bean and delegates all method invocations to an actual bean instance.

Take this example of JDK proxies (achieved through @EnableAsync's default proxyTargetClass of false)

@Configuration
@EnableAsync
public class Example {
    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Example.class);
        System.out.println(ctx.getBean(HttpClientImpl.class).getClass());
    }
}

interface HttpClient {
    void doGetAsync();
}

@Component
class HttpClientImpl implements HttpClient {
    @Async
    public void doGetAsync() {
        System.out.println(Thread.currentThread());
    }
}

Here, Spring attempts to find a bean of type HttpClientImpl which we expect to find because the type is clearly annotated with @Component. However, instead, we get an exception

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: 
    No qualifying bean of type [com.example.HttpClientImpl] is defined

Spring wrapped the HttpClientImpl bean and exposed it through a Proxy object that only implements HttpClient. So you could retrieve it with

ctx.getBean(HttpClient.class) // returns a dynamic class: com.example.$Proxy33
// or
@Autowired private HttpClient httpClient;

It's always recommended to program to interfaces. When you can't, you can tell Spring to use CGLIB proxies. For example, with @EnableAsync, you can set proxyTargetClass to true. Similar annotations (EnableTransactionManagement, etc.) have similar attributes. XML will also have equivalent configuration options.

ApplicationContext Hierarchies - Spring MVC

Spring lets you build ApplicationContext instances with other ApplicationContext instances as parents, using ConfigurableApplicationContext#setParent(ApplicationContext). A child context will have access to beans in the parent context, but the opposite is not true. This post goes into detail about when this is useful, particularly in Spring MVC.

In a typical Spring MVC application, you define two contexts: one for the entire application (the root) and one specifically for the DispatcherServlet (routing, handler methods, controllers). You can get more details here:

• Difference between applicationContext.xml and spring-servlet.xml in Spring Framework

It's also very well explained in the official documentation, here.

A common error in Spring MVC configurations is to declare the WebMVC configuration in the root context with @EnableWebMvc annotated @Configuration classes or <mvc:annotation-driven /> in XML, but the @Controller beans in the servlet context. Since the root context cannot reach into the servlet context to find any beans, no handlers are registered and all requests fail with 404s. You won't see a NoSuchBeanDefinitionException, but the effect is the same.

Make sure your beans are registered in the appropriate context, ie. where they can be found by the beans registered for WebMVC (HandlerMapping, HandlerAdapter, ViewResolver, ExceptionResolver, etc.). The best solution is to properly isolate beans. The DispatcherServlet is responsible for routing and handling requests so all related beans should go into its context. The ContextLoaderListener, which loads the root context, should initialize any beans the rest of your application needs: services, repositories, etc.

Arrays, collections, and maps

Beans of some known types are handled in special ways by Spring. For example, if you tried to inject an array of MovieCatalog into a field

@Autowired
private MovieCatalog[] movieCatalogs;

Spring will find all beans of type MovieCatalog, wrap them in an array, and inject that array. This is described in the Spring documentation discussing @Autowired. Similar behavior applies to Set, List, and Collection injection targets.

For a Map injection target, Spring will also behave this way if the key type is String. For example, if you have

@Autowired
private Map<String, MovieCatalog> movies;

Spring will find all beans of type MovieCatalog and add them as values to a Map, where the corresponding key will be their bean name.

As described previously, if no beans of the requested type are available, Spring will throw a NoSuchBeanDefinitionException. Sometimes, however, you just want to declare a bean of these collection types like

@Bean
public List<Foo> fooList() {
    return Arrays.asList(new Foo());
}

and inject them

@Autowired
private List<Foo> foos;

In this example, Spring would fail with a NoSuchBeanDefinitionException because there are no Foo beans in your context. But you didn't want a Foo bean, you wanted a List<Foo> bean. Before Spring 4.3, you'd have to use @Resource

For beans that are themselves defined as a collection/map or array
type, @Resource is a fine solution, referring to the specific
collection or array bean by unique name. That said, as of 4.3,
collection/map and array types can be matched through Spring’s
@Autowired type matching algorithm as well, as long as the element
type information is preserved in @Bean return type signatures or
collection inheritance hierarchies. In this case, qualifier values can
be used to select among same-typed collections, as outlined in the
previous paragraph.

This works for constructor, setter, and field injection.

@Resource
private List<Foo> foos;
// or since 4.3
public Example(@Autowired List<Foo> foos) {}

However, it will fail for @Bean methods, ie.

@Bean
public Bar other(List<Foo> foos) {
    new Bar(foos);
}

Here, Spring ignores any @Resource or @Autowired annotating the method, because it's a @Bean method, and therefore can't apply the behavior described in the documentation. However, you can use Spring Expression Language (SpEL) to refer to beans by their name. In the example above, you could use

@Bean
public Bar other(@Value("#{fooList}") List<Foo> foos) {
    new Bar(foos);
}

to refer to the bean named fooList and inject that.

NoSuchBeanDefinitionException

You have your TokenIntegration marked as @Autowired so you need to tell Spring that it should manage your TokenIntegration bean:

@Component
public class TokenIntegration

This will let Spring know to create one of these beans and put it into the application context, which will in turn make it so that Spring can provide a bean to your @Autowired field.

In other words:

If a bean is not in Spring's application context, it cannot be autowired by Spring. As far as Spring knows it does not exist.

To answer your edit:

Could not autowire field:RestTemplate in Spring boot application

NoSuchBeanDefinitionException: No qualifying bean of type

Try to to autowire your beans using interfaces rather than implementations :

@RestController
public class OrderController {

    @Autowired
    @Qualifier("carSvc")
    DAOService carSvc;

    @Autowired
    @Qualifier("orderSvc")
    DAOService orderSvc;

}

Edit : But before that you have to give names to your services :

@Service("carSvc")
public class CarSvc extends AbstractService implements DAOService<Car> {}

@Service("orderSvc")
public class OrderSvc extends AbstractService implements DAOService<Order> {}

What's going on here is that Spring generate proxies of your services based on the CarSvc, OrderSvc and implement the DAOService but does not extend the CarSvc, OrderSvc.

//somthing like this
class CarSvcProxy implement DAOService {

    public Object getOrder(Long id) {

        try {

            // ...

            txManager.commit();

        } catch (Exception ex) {
            txManager.rollback();
        }
    }
}

@RestController
public class OrderController {

    //So when you do this :
    @Autowired
    CarSvc carSvc;

    //it's somehow like if you did : 
    CarSvc carSvc = new CarSvcProxy(); //carSvc != CarSvcProxy

    //But this will work :
    DAOService carSvc = new CarSvcProxy(); //because CarSvcProxy implement DAOService

}

NoSuchBeanDefinitionException: No qualifying bean

You cannot inject the concrete class UserService in this case. This is because Spring is creating a proxy for your class in order to handler @Transactional. Since your service implements an interface Spring is creating a JDK interface based proxy i.e the proxy implements UserServiceInterface and delegates to UserService. Hence the bean that Spring manages is not a UserService but a UserServiceInterface

There are two ways to solve this. The simplest is to change your dependency from UserService to UserServiceInterface

@Controller
public class WebController {

    @Autowired
    private UserServiceInterface userService;

}

The second way is to instruct Spring to use CGLIB class based proxies instead of JDK interface based proxies. Change your tx:annotation-driven to specify proxy-target-class to true

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd"


    <annotation-driven />

    <tx:annotation-driven proxy-target-class="true/>

    <resources mapping="/resources/**" location="/resources/" />


    <beans:bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <context:component-scan base-package="com.nickolay.app" />

    <beans:bean id="userDao" class="com.nickolay.app.dao.HibernateUserDao" />
    <beans:bean id="roleDao" class="com.nickolay.app.dao.HibernateRoleDao" />
    <beans:bean id="userService" class="com.nickolay.app.service.UserService">
    </beans:bean>


</beans:beans>

How to resolve Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type

Please try to include the following annotations on top of the test class.

@SpringBootTest
@AutoConfigureMockMvc
@RunWith(SpringRunner.class)

This will load the full context.

Apart from this Controller class also uses the PersonService class, hence that also needs to be mocked. and corresponding calls needs to be set with expected values.

  @MockBean
  private PersonService personService;

when(personService.clearPastHistory(request)).thenReturn(<PersonResponse>);

NoSuchBeanDefinition exception

I guess your package com.cnanational.productservice.model is not under the package where your entry point ( the class annotated with @SpringBootApplication)

Spring needs to know where to scan for the beans, in spring boot by default spring boot will scan the package where the class annotated with @SpringBootApplication is and the packages under that package, also you can use @componantscan to specify the packages you need to scan, so you can solve your issue like this

@SpringBootApplication
@ComponentScan("com.cnanational.productservice.model")

or place your bean implementation under a package which will be scanned by default.

Also you need to make sure that your class is registered as a bean so if your Validator interface is not registered as bean, you can either annotate Validator or CreateDealerSeriesAttributesRequestValidator @Component or use @Bean to create an instance of CreateDealerSeriesAttributesRequestValidator under one of your configuration classes.

Note since you are using the interface to autowired you need to be careful when you have more than one implementation, you will need to help spring decide which implementation to pick using @Qualifier

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