So I'm trying to autowire an interface.
MyApp:
#SpringBootApplication(scanBasePackages={"com.B","com.C"})
public class MyApp {
...
}
MyController (which is in package com.B):
#RestController
#RequestMapping("/users")
public class UserController
{
#Autowired
MyInterface myInterface;
}
MyInterface (which is in package com.C):
#Service
public interface MyInterface
{
...
}
But I'm getting this error:
Consider defining a bean of type 'C.MyInterface' in your configuration.
even though I have:
The package included here: #SpringBootApplication(scanBasePackages={"com.B","com.C"})
#Service in the interface
Is it even possible to autowire an interface?
Yes you can inject an interface. But there should be at least one implementation that is declared as bean, so Spring manages it and will know what to inject. If you have more then one implementation you will need to specify which one you want. Read about annotation #Resource and about and it's property "name". A good article to read about it would be Wiring in Spring: #Autowired, #Resource and #Inject. Also, If you have many implementations of the same interface and want to inject them all you can do this:
#Autowired
private List<DataSource> dataSources;
If DataSource is an interface the list will contain all of its implementations. You can read about it here and here
I am getting the following error in a Spring Boot project on which I work:
The bean 'auditLogDao' could not be injected as a '{redactedpathwithcorporatename}.AuditLogDao' because it is a JDK dynamic proxy that implements:
org.springframework.data.jpa.repository.JpaRepository
Action:
Consider injecting the bean as one of its interfaces or forcing the use of CGLib-based proxies by setting proxyTargetClass=true on #EnableAsync and/or #EnableCaching.
I have tried a variety of solutions on StackOverflow without success, specifically:
Checking that I am indeed calling the interface, not the implementation.
Adding #Component to the top of SwitchUserFilter
Changing #Resource to #Autowired.
AuditLogDao.java
public interface AuditLogDao extends JpaRepository<AuditLog, String> {}
AuditLogService.java
public interface AuditLogService {
AuditLog save(final AuditLog auditLog);
}
AuditLogServiceImplementation.java
public class AuditLogServiceImplementation implements AuditLogService{
#Resource private AuditLogDao auditLogDao;
#Override
public AuditLog save(AuditLog auditLog) {
return auditLogDao.save(auditLog);
}
}
The file where I actually want to use the service to save information
SwitchuserFilter.java
public class SwitchUserFilter
extends org.springframework.security.web.authentication.switchuser.SwitchUserFilter {
#Resource AuditLogService logService;
'''
logService.save(auditLog);
'''
}
I am relatively new to Spring Boot, so an explanation of why it fixes the problem would be appreciated.
I believe the following code will solve your problem. Add it to the AuditLogServiceImplementation and remove the #Resource annotation from the auditLogDao.
#Autowired
private ListableBeanFactory beanFactory;
#EventListener({ContextRefreshedEvent.class})
void contextRefreshedEvent() {
auditLogDao = beanFactory.getBean(AuditLogDao.class);
}
You can do a similar trick in the filter too, whatever more comfortable for you.
I don't know what is the exact problem, but it's some kind of circular-dependency-like issue.
So by manually importing any bean which is affected in this loop, you can resolve the loop. You will set this one particular dependency AFTER Spring had created all of the other beans.
In my Spring project I have an interface:
public interface MyIntefrace {
void myMethod(String myParam);
}
and I have a class that implements it:
#Component
#Profile("prod")
public class MyImplementationClass implements MyInterface {
...
In my other class, I'm using this object as follows:
#Autowired
MyInterface myinterface;
...
myinterface.myMethod(someParam);
And it throws me an error:
Field myinterface in mypackage required a bean of type ... that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Consider defining a bean of type '...' in your configuration
I tried to add #Service annotation above MyInterface but that didn't help. What else can I do?
Make sure the prod profile is enable such as through :
JVM property :
-Dspring.profiles.active=prod
Or environment variable:
export spring_profiles_active=prod
Or programmatically when creating ApplicationContext:
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
//...........
ctx.getEnvironment().setActiveProfiles("prod");
ctx.refresh();
The answer provided by #KenChan already mentioned a viable solution, but i wanted to add some additional details. Currently, you only have one implementation of MyIntefrace, which is also annotated with #Profile. If you don not run you application using this profile, all other beans that depend on that bean (and are not optionally injected using getter/setter injection) can not be created.
I recommend you either create a second implementation that will be injected if your profile is not activated, or annotate all depending beans as well with that profile.
#Component
#Profile("prod")
public class MyImplementationClass implements MyInterface {
// ...
}
#Component
#Profile("!prod") // second implementation, used if 'prod' is not active
public class MyImplementationClass implements MyInterface {
// ...
}
For several days I'm trying to create Spring CRUD application. I'm confused.
I can't solve this errors.
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientController': Unsatisfied dependency expressed through method 'setClientService' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientService': Unsatisfied dependency expressed through field 'clientRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.kopylov.repository.ClientRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
and this
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientService': Unsatisfied dependency expressed through field 'clientRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.kopylov.repository.ClientRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
ClientController
#Controller
public class ClientController {
private ClientService clientService;
#Autowired
#Qualifier("clientService")
public void setClientService(ClientService clientService){
this.clientService=clientService;
}
#RequestMapping(value = "registration/add", method = RequestMethod.POST)
public String addUser(#ModelAttribute Client client){
this.clientService.addClient(client);
return "home";
}
}
ClientServiceImpl
#Service("clientService")
public class ClientServiceImpl implements ClientService{
private ClientRepository clientRepository;
#Autowired
#Qualifier("clientRepository")
public void setClientRepository(ClientRepository clientRepository){
this.clientRepository=clientRepository;
}
#Transactional
public void addClient(Client client){
clientRepository.saveAndFlush(client);
}
}
ClientRepository
public interface ClientRepository extends JpaRepository<Client, Integer> {
}
I looked through a lot of similar questions, but no one answer to them can't help me.
The ClientRepository should be annotated with #Repository tag.
With your current configuration Spring will not scan the class and have knowledge about it. At the moment of booting and wiring will not find the ClientRepository class.
EDIT
If adding the #Repository tag doesn't help, then I think that the problem might be now with the ClientService and ClientServiceImpl.
Try to annotate the ClientService (interface) with #Service. As you should only have a single implementation for your service, you don't need to specify a name with the optional parameter #Service("clientService"). Spring will autogenerate it based on the interface' name.
Also, as Bruno mentioned, the #Qualifier is not needed in the ClientController as you only have a single implementation for the service.
ClientService.java
#Service
public interface ClientService {
void addClient(Client client);
}
ClientServiceImpl.java (option 1)
#Service
public class ClientServiceImpl implements ClientService{
private ClientRepository clientRepository;
#Autowired
public void setClientRepository(ClientRepository clientRepository){
this.clientRepository=clientRepository;
}
#Transactional
public void addClient(Client client){
clientRepository.saveAndFlush(client);
}
}
ClientServiceImpl.java (option 2/preferred)
#Service
public class ClientServiceImpl implements ClientService{
#Autowired
private ClientRepository clientRepository;
#Transactional
public void addClient(Client client){
clientRepository.saveAndFlush(client);
}
}
ClientController.java
#Controller
public class ClientController {
private ClientService clientService;
#Autowired
//#Qualifier("clientService")
public void setClientService(ClientService clientService){
this.clientService=clientService;
}
#RequestMapping(value = "registration", method = RequestMethod.GET)
public String reg(Model model){
model.addAttribute("client", new Client());
return "registration";
}
#RequestMapping(value = "registration/add", method = RequestMethod.POST)
public String addUser(#ModelAttribute Client client){
this.clientService.addClient(client);
return "home";
}
}
I know it seems too late, but it may help others in future.
I face the same error and the problem was that spring boot did not read my services package so add:
#ComponentScan(basePackages = {"com.example.demo.Services"}) (you have to specify your own path to the services package) and in the class demoApplication (class that have main function) and for service interface must be annotated #Service and the class that implement the service interface must be annotated with #Component, then autowired the service interface.
Try adding #EntityScan(basePackages = "insert package name here") on top of your main class.
If you are using Spring Boot, your main app should be like this (just to make and understand things in simple way) -
package aaa.bbb.ccc;
#SpringBootApplication
#ComponentScan({ "aaa.bbb.ccc.*" })
public class Application {
.....
Make sure you have #Repository and #Service appropriately annotated.
Make sure all your packages fall under - aaa.bbb.ccc.*
In most cases this setup resolves these kind of trivial issues. Here is a full blown example. Hope it helps.
That might happen because the pojos you are using lack of the precise constructor the service needs. That is, try to generate all the constructors for the pojo or objects (model object) that your serviceClient uses, so that the client can be instanced correctly. In your case,regenerate the constructors (with arguments)for your client object (taht is your model object).
I just added the #Repository annotation to Repository interface and #EnableJpaRepositories ("domain.repositroy-package") to the main class. It worked just fine.
The application needs to be placed in the same directory as the scanned package:
I was facing the same issue, and it was, as i missed marking my DAO class with Entity annotations. I tried below and error got resolved.
/**
*`enter code here`
*/
#Entity <-- was missing earlier
public class Topic {
#Id
String id;
String name;
String desc;
.
.
.
}
Add #Repository annotation to the Spring Data JPA repo
According to documentation you should set XML configuration:
<jpa:repositories base-package="com.kopylov.repository" />
Considering that your package scanning is correctly set either through XML configuration or annotation based configuration.
You will need a #Repository on your ClientRepository implementation as well to allow Spring to use it in an #Autowired. Since it's not here we can only suppose that's what's missing.
As a side note, it would be cleaner to put your #Autowired/#Qualifier directly on your member if the setter method is only used for the #Autowired.
#Autowired
#Qualifier("clientRepository")
private ClientRepository clientRepository;
Lastly, you don't need the #Qualifier is there is only one class implementing the bean definition so unless you have several implementation of ClientService and ClientRepository you can remove the #Qualifier
I had the exactly same issue, with a very very long stack trace.
At the end of the trace I saw this:
InvalidQueryException: Keyspace 'mykeyspace' does not exist
I created the keyspace in cassandra, and solved the problem.
CREATE KEYSPACE mykeyspace
WITH REPLICATION = {
'class' : 'SimpleStrategy',
'replication_factor' : 1
};
Check out the table structure of Client table, if there is a mismatch between table structure in db and the entity, you would get this error..
I had this error which was coming due to datatype mismatch of primary key between db table and the entity ...
If you describe a field as criteria in method definition ("findBy"), You must pass that parameter to the method, otherwise you will get "Unsatisfied dependency expressed through method parameter" exception.
public interface ClientRepository extends JpaRepository<Client, Integer> {
Client findByClientId(); ////WRONG !!!!
Client findByClientId(int clientId); /// CORRECT
}
*I assume that your Client entity has clientId attribute.
That was the version incompatibility where their was the inclusion of lettuce. When i excluded , it worked for me.
<!--Spring-Boot 2.0.0 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<groupId>io.lettuce</groupId>
<artifactId>lettuce-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
There is another instance still same error will shown after you doing everything above mentioned. When you change your codes accordingly mentioned solutions make sure to keep originals. So you can easily go back. So go and again check dispatcher-servelet configuration file's base package location. Is it scanning all relevant packages when you running application.
<context:component-scan base-package="your.pakage.path.here"/>
Add #Component annotation just above the component definition
This error can occur if there are syntax errors with Derived Query Methods. For example, if there are some mismatches with entity class fields and the Derived methods' names.
See if your <context:component-scan base-package="your package "/> is missing in either config or context xml file
I was facing this issue because of duplicate column name staffId and staff_id in same entity class.
private Integer staffId;
#ManyToOne(cascade = CascadeType.ALL, optional = false)
#JoinColumn(name = "staff_id")
private User user;
My issue got resolved by adding "value" & "nativeQuery" tags in #Query annotation like this:
#Query(value = "select * from employee e where e.email_address = ?1", nativeQuery = true)
In my case, I was using dependency of spring boot 3 in spring boot 4.
make sure you use latest dependency version.
you can find that here https://mvnrepository.com/
I was facing the same issue. In my Product Entity Class I had imported #Id from org.springframework.data.annotation.Id and this was causing the error.
It was fixed after I change it to import jakarta.persistence.Id;
Just add #Service annotation to top of the service class
I have an autowired class like this
#Component
public class APIPermissionCheck {
..............
}
its injecting fine in one java file. But its always returning null in other java file. What could be the possible cause of this? How to debug/fix this issue?
working fine in this class
#Repository("MyClassRepo")
public class MyClassRepoImpl implements MyClassRepo {
.......
#Autowired
private APIPermissionCheck apiPermissionCheck;
.......
}
Not working in this class
public class ApiConnection {
.......
#Autowired
private APIPermissionCheck apiPermissionCheck;
.......
}
The class ApiConnection is not found by spring because it is neither annotated as #Component neither as #Repository.
If you annotate your class with #Component it should work.
Also ensure that the package with the class is scanned by spring.
Does your second class marked as spring bean?
Do you scan the package in which your second class by spring?
you can view configuration sample at spring site
EDIT :
Create a setter for the bean you're trying to inject
public void setApiPermissionCheck(APIPermissionCheck apiPermissionCheck){
this.apiPermissionCheck = apiPermissionCheck
}
Try to add an interface to ApiConnection to verify it's being loaded by Spring Container.
ApiConneection implements ApplicationContextAware {
#Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
logger.info("Initializing context is:" + applicationContext);
}
....
}
do the same for the Autowiring classes and verify they are being loaded withint the same context.
You problem is probably:
The bean is not initialized with a spring
Autowired beans belongs to another context
Context for ApiConnection is not instructed with <context:annotation-config/>
I found the solution. As ApiConnection object is being created a lot of places manually so spring framework is not autowiring it.
I met the same problem and solved it by adding a #Service to the second class public class ApiConnection. The first class already has a #Service. In this step, it still does not work (return NullPointerException). In addition, in the Class that use ApiConnection, let's say ApplicationImpl, I add #Autowired on ApiConnection apiConnection; (ApiConnection apiConnection = new XXX was used before). Then it works.