java-项目树更改后,Spring UnsatisfiedDependencyException
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我是Spring的新手,我正在尝试制作一个简单的rest应用程序.当我将所有文件放在一个软件包中时,该应用程序运行良好.由于更改了项目组织,因此无法构建项目.我收到此错误：
2017-09-30 22:32:48.428 WARN 9428 --- [ main] o.s.w.c.s.GenericWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'application': Unsatisfied dependency expressed through field 'repository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'socketApp.dal.repository.CustomerRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2017-09-30 22:32:48.431 INFO 9428 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-09-30 22:32:48.495 ERROR 9428 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field repository in socketApp.main.Application required a bean of type 'socketApp.dal.repository.CustomerRepository' that could not be found.
Action:
Consider defining a bean of type 'socketApp.dal.repository.CustomerRepository' in your configuration.
2017-09-30 22:32:48.496 ERROR 9428 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@16267862] to prepare test instance [hello.GreetingControllerTests@47f08b81]
我当前的项目树如下所示
src
main
java
app
dal
model
-Customer.java
repository
-CustomerRepository.java
main
-Aplication.java
webServices
-GreetingController.java
这是我的Customer.java文件：
package socketApp.dal.model;
import org.springframework.data.annotation.Id;
public class Customer {
@Id
public String id;
public String firstName;
public String lastName;
public Customer() {}
public Customer(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return String.format(
"Customer[id=%s, firstName='%s', lastName='%s']",
id, firstName, lastName);
}
}
我的CustomerRepository.java文件：
package socketApp.dal.repository;
import java.util.List;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
import socketApp.dal.model.Customer;
@Repository
public interface CustomerRepository extends MongoRepository<Customer, String> {
public Customer findByFirstName(String firstName);
public List<Customer> findByLastName(String lastName);
}
我的Application.java
package socketApp.main;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import socketApp.dal.model.Customer;
import socketApp.dal.repository.CustomerRepository;
@SpringBootApplication
public class Application implements CommandLineRunner{
@Autowired
private CustomerRepository repository;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
public void run(String... args) throws Exception {
repository.deleteAll();
// save a couple of customers
repository.save(new Customer("Alice", "Smith"));
repository.save(new Customer("Bob", "Smith"));
// fetch all customers
System.out.println("Customers found with findAll():");
System.out.println("-------------------------------");
for (Customer customer : repository.findAll()) {
System.out.println(customer);
}
System.out.println();
// fetch an individual customer
System.out.println("Customer found with findByFirstName('Alice'):");
System.out.println("--------------------------------");
System.out.println(repository.findByFirstName("Alice"));
System.out.println("Customers found with findByLastName('Smith'):");
System.out.println("--------------------------------");
for (Customer customer : repository.findByLastName("Smith")) {
System.out.println(customer);
}
}
}
最后是我的GreetingController.java
package socketApp.webServices;
import socketApp.dal.repository.CustomerRepository;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import socketApp.dal.model.Customer;
import socketApp.dal.model.Greeting;
@RestController
public class GreetingController {
@Autowired
private CustomerRepository repository;
@RequestMapping("/")
public List<Customer> getAllCustomers(){
// fetch all customers
return repository.findAll();
}
}
解决方法:
您或者必须将Application类移动到一个包中,以使该类位于其他包之上的包中,或者通过scanBasePackages或scanBasePackageClasses手动指定basePackage来由@SpringBootApplication启动的组件扫描.
看到
> Using the @SpringBootApplication annotation和
> Structuring your code
更多细节.
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