I am trying to apply spring security with jpa but I am getting error

Question

I am trying to apply Spring Security with JPA but I am getting the following error:

Error creating bean with name 'myUserDetailService': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in MainApplication.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.springframework.security.core.userdetails.User
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.16.jar:5.3.16]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.16.jar:5.3.16]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.4.jar:2.6.4]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740) ~[spring-boot-2.6.4.jar:2.6.4]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415) ~[spring-boot-2.6.4.jar:2.6.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-2.6.4.jar:2.6.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312) ~[spring-boot-2.6.4.jar:2.6.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) ~[spring-boot-2.6.4.jar:2.6.4]
at MainApplication.SpringSecurityJpaApplication.main(SpringSecurityJpaApplication.java:11) ~[classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in MainApplication.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class org.springframework.security.core.userdetails.User
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ~[spring-beans-5.3.16.jar:5.3.16]
... 20 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not a managed type: class org.springframework.security.core.userdetails.User
at org.hibernate.metamodel.internal.MetamodelImpl.managedType(MetamodelImpl.java:582) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.hibernate.metamodel.internal.MetamodelImpl.managedType(MetamodelImpl.java:85) ~[hibernate-core-5.6.5.Final.jar:5.6.5.Final]
at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:75) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:66) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:232) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:181) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:164) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:75) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:324) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:322) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:230) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:328) ~[spring-data-commons-2.6.2.jar:2.6.2]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:144) ~[spring-data-jpa-2.6.2.jar:2.6.2]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) ~[spring-beans-5.3.16.jar:5.3.16]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ~[spring-beans-5.3.16.jar:5.3.16]
... 30 common frames omitted

SecurityConfig.java

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

  @Autowired
  MyUserDetailService service;

  @Override
  protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.userDetailsService(service);
  }

  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http
      .authorizeRequests()
      .antMatchers("/user").hasAnyRole("user","admin")
      .antMatchers("/admin").hasRole("admin")
      .antMatchers("/").permitAll()
      .and()
      .formLogin();
  }
}

MyUserDetailService.java

@Service
public class MyUserDetailService implements UserDetailsService {

  @Autowired
  UserRepository userRepository;

  @Override
  public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    // TODO Auto-generated method stub
    return userRepository.findByuserName(username);
  }

}

UserRepository.java

public interface  UserRepository extends JpaRepository<User, Integer> {
  public User findByuserName(String userName);
}

User.java

@Entity
public class User implements UserDetails {

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private int id;
  private String userName;

  private String password;

  boolean isActive;

  String authority;

  @Override
  public Collection<? extends GrantedAuthority> getAuthorities() {
    List<GrantedAuthority> authority=new ArrayList<>();
    String []auth_obj=this.authority.split(":");
    for(String obj:auth_obj) {
        GrantedAuthority obj1=new SimpleGrantedAuthority(obj);
        authority.add(obj1);
    }
    
    return authority;
  }

  @Override
  public String getPassword() {
    // TODO Auto-generated method stub
    return this.password;
  }

  @Override
  public String getUsername() {
    // TODO Auto-generated method stub
    return this.userName;
  }

  @Override
  public boolean isAccountNonExpired() {
    // TODO Auto-generated method stub
    return true;
  }

  @Override
  public boolean isAccountNonLocked() {
    // TODO Auto-generated method stub
    return true;
  }

  @Override
  public boolean isCredentialsNonExpired() {
    // TODO Auto-generated method stub
    return true;
  }

  @Override
  public boolean isEnabled() {
    // TODO Auto-generated method stub
    return this.isActive;
  }

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public void setUserName(String userName) {
    this.userName = userName;
  }

  public void setPassword(String password) {
    this.password = password;
  }

}

UserController.java

@RestController
public class UserController {

  @GetMapping("/user")
  public String user() {
    return "Well Come user";
  }

  @GetMapping("/admin")
  public String admin() {
    return "Hello I am admin";
  }

  @GetMapping("visitor")
  public String visitor() {
    return "I am a visitor";
  }

  @Bean
  public PasswordEncoder getPasswordEncoder() {
    return NoOpPasswordEncoder.getInstance();
  }
}

SpringSecurityJpaApplication.java

@SpringBootApplication
public class SpringSecurityJpaApplication {

  public static void main(String[] args) {
    SpringApplication.run(SpringSecurityJpaApplication.class, args);
  }

}