英文:
Cannot invoke"org.springframework.web.client.RestTemplate.getForEntity(String, java.lang.Class, Object[])""this.restTemplate"null
问题
我正在开发一个tokenValidationInterceptor，其中会向另一个微服务发送令牌验证请求，该微服务与Keycloak通信并返回正常状态或未授权状态。然后，我在prehandle函数中添加了一些逻辑，就是这样。当我尝试测试它时，我得到了这个错误：
java.lang.NullPointerException: Cannot invoke "org.springframework.web.client.RestTemplate.getForEntity(String, java.lang.Class, Object[])" because "this.restTemplate" is null
TokenValidationInterceptor的preHandle方法：
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
String token = request.getHeader(HttpHeaders.AUTHORIZATION);
String verificationUrl = "http://localhost:8090/user/info?token=" + token;
ResponseEntity<Boolean> verificationResponse = restTemplate.getForEntity(verificationUrl, Boolean.class);
if (verificationResponse.getStatusCode() == HttpStatus.OK && verificationResponse.getBody() != null && verificationResponse.getBody()) {
return true;
} else {
response.setStatus(HttpStatus.UNAUTHORIZED.value());
return false;
}
}
Appconfig：
@Configuration
public class AppConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new TokenValidationInterceptor());
}
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
另一个微服务中的令牌验证：
public ResponseEntity<?> verifyToken(String token) {
String keycloakUrl = "http://localhost:8080/auth/realms/lbv-realm/protocol/openid-connect/userinfo";
if (token != null) {
HttpHeaders headers = new HttpHeaders();
headers.setBearerAuth(token);
HttpEntity<String> requestEntity = new HttpEntity<>(headers);
RestTemplate restTemplate = new RestTemplate();
try {
ResponseEntity<String> response = restTemplate.exchange(keycloakUrl, HttpMethod.GET, requestEntity, String.class);
HttpStatus statusCode = response.getStatusCode();
if (statusCode.is2xxSuccessful()) {
return ResponseEntity.status(HttpStatus.OK).body(true);
} else {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
} catch (Exception ex) {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
} else {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
}
请注意，我已经将HTML编码的引号(")更改为普通的双引号(")以便于代码的理解。
英文:
i'm working on an tokenValidationInterceptor , where a request for token validation is send to an other micro-service which communicate with keycloak and send an ok status or unautorazed status , then i add some logic to the prehandle function and that's all , when i try to test it, i get this error :
java.lang.NullPointerException: Cannot invoke "org.springframework.web.client.RestTemplate.getForEntity(String, java.lang.Class, Object[])" because "this.restTemplate" is null
TokenValidationInterceptor prehandle method
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
String token = request.getHeader(HttpHeaders.AUTHORIZATION);
String verificationUrl = "http://localhost:8090/user/info?token=" + token;
ResponseEntity<Boolean> verificationResponse = restTemplate.getForEntity(verificationUrl, Boolean.class);
if (verificationResponse.getStatusCode() == HttpStatus.OK && verificationResponse.getBody() != null && verificationResponse.getBody()) {
return true;
} else {
response.setStatus(HttpStatus.UNAUTHORIZED.value());
return false;
}
}
Appconfig
@Configuration
public class AppConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor( new TokenValidationInterceptor());
}
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
and for the tokenValidation in the other micro-service
public ResponseEntity<?> verifyToken(String token) {
String keycloakUrl = "http://localhost:8080/auth/realms/lbv-realm/protocol/openid-connect/userinfo";
if (token != null) {
HttpHeaders headers = new HttpHeaders();
headers.setBearerAuth(token);
HttpEntity<String> requestEntity = new HttpEntity<>(headers);
RestTemplate restTemplate = new RestTemplate();
try {
ResponseEntity<String> response = restTemplate.exchange(keycloakUrl, HttpMethod.GET, requestEntity, String.class);
HttpStatusCode statusCode = response.getStatusCode();
if (statusCode.is2xxSuccessful()) {
return ResponseEntity.status(HttpStatus.OK).body(true);
} else {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
} catch (Exception ex) {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
} else {
return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(false);
}
}
答案1
得分: 0
如果您的 restTemplate 为null，您可以通过构造函数或 @Autowired 注解来简单地注入 RestTemplate。
@Autowired
private RestTemplate restTemplate;
或者
public class YourClass {
private final RestTemplate restTemplate;
public YourClass(RestTemplate restTemplate) {
this.restTemplate = restTemplate;
}
}
英文:
If your restTemplate is null,you can simply inject RestTemplate through constructor or @Autowired annotation.
@Autowired
private RestTemplate restTemplate;
or
public class YourClass{
private final RestTemplate restTemplate;
public YourClass(RestTemplate restTemplate){
this.restTemplate=restTemplate;
}
}
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