如何解决javax.servlet.ServletException：循环视图路径[错误]？

Question

我实际上正在通过boot和rest api学习Spring Security。我已经编写了用于保护我的api的代码，但是出现了错误。我搜索了很多，但没有解决方案对我有用。

这是我的应用程序的屏幕截图

我的一个控制器中有以下代码：

@RestController
@RequestMapping("secured")
public class LoginController {

@PreAuthorize("hasAnyRole('ADMIN')")
@GetMapping(produces = MediaType.TEXT_PLAIN_VALUE, value = "/all")
public String hello() {
    return "hello Youtube";
}

@PreAuthorize("hasAnyRole('user')")
@GetMapping("/a")
public @ResponseBody String securedHello() {
    return "Secured Hello";
}
}

SecurityConfig类

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
@EnableJpaRepositories(basePackageClasses=UserDetailsService.class)
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws 
    Exception {

      auth.userDetailsService(userDetailsService)
          .passwordEncoder(getPasswordEncoder());

    //auth.authenticationProvider(authenticationProvider());
    }

private PasswordEncoder getPasswordEncoder() {
    return new PasswordEncoder() {

        @Override
        public boolean matches(CharSequence charSequence, String s) {
            return true;
        }

        @Override
        public String encode(CharSequence charSequence) {
            return charSequence.toString();
        }
    };

}

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.csrf().disable();
        http.authorizeRequests().antMatchers("/secured/**").authenticated().anyRequest().hasAnyRole("ADMIN").and()
        .formLogin().permitAll();   
}    

application.properties

server.port:8969
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/pharmaplussecurity
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.properties.hibernate.dialect =org.hibernate.dialect.MySQL5Dialect
spring.application.name: PharmaPlus-security
spring.jpa.show-sql=true
server.servlet.session.timeout=300s
server.error.whitelabel.enabled=false
spring.jpa.open-in-view=false

UserServiceImpl类

@Service
public class UserServiceImpl implements UserDetailsService {

@Autowired
private UserRepository userRepository;

@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    Optional<User> optionalUser = userRepository.findByUsername(username);

    optionalUser
          .orElseThrow(() -> new UsernameNotFoundException("Username Not Found"));
    return optionalUser
                .map(CustomUserDetails::new).get();     
}

}

CustomeUserDetails类

public class CustomUserDetails extends User implements UserDetails {

public CustomUserDetails(final User user) {
    super(user);
}
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
    return getRoles()
            .stream()
            .map(role -> new SimpleGrantedAuthority("ROLE_"+role.getRole()))
            .collect(Collectors.toList());
}

@Override
public String getPassword() {
    return super.getPassword();
}

@Override
public String getUsername() {
    return super.getUsername();
}

@Override
public boolean isAccountNonExpired() {
    return true;
}

@Override
public boolean isAccountNonLocked() {
    return true;
}

@Override
public boolean isCredentialsNonExpired() {
    return true;
}

@Override
public boolean isEnabled() {
    return true;
}

}

PharmaPlusSecurity类

@EntityScan("com.pk.pharmasecurity.entity")
@EnableJpaRepositories("com.pk.pharmasecurity.repository")
@ComponentScan(basePackageClasses = SecurityConfiguration.class)
@SpringBootApplication
@EnableEurekaClient
public class PharmaPlusSecurityApplication {

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

还有pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
    <!-- <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-oauth2</artifactId> 
        </dependency> -->
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>