I am working with Spring Cloud. I have four services in my spring boot application college-service, student-service, eureka-server and api-gateway. I am trying to call college-service and student-service with API Gateway. While I'm calling My college-service from API Gateway that's work fine but student-service is not working. While I am trying to get student-serivice, I get error 404 not found. I'm new guy in Spring Cloud. Here down is my code.

Here down is my urls, Where in last url I get 404

Colleger Service

Entity

public class College {
    private String clgId;
    private String clgName;
    private String clgCity;

    List<Student> students;

    public College(String clgId, String clgName, String clgCity, List<Student> students) {
        this.clgId = clgId;
        this.clgName = clgName;
        this.clgCity = clgCity;
        this.students = students;
    }

    public College(String clgId, String clgName, String clgCity) {
        this.clgId = clgId;
        this.clgName = clgName;
        this.clgCity = clgCity;
    }
   
    // getter and setter
}

public class Student {
    private Long stId;
    private String stName;
    private String stEmail;
    private String clgId;

    public Student(Long stId, String stName, String stEmail, String clgId) {
        super();
        this.stId = stId;
        this.stName = stName;
        this.stEmail = stEmail;
        this.clgId = clgId;
    }

    // getter and setter
}

College Controller

@RestController
@RequestMapping("/college")
public class CollegeController {
    @Autowired
    private CollegeService collegeService;

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "/{clgId}", method = RequestMethod.GET)
    public ResponseEntity<College> getColleges(@PathVariable("clgId") String clgId) {
        College college = collegeService.getCollege(clgId);
        List student = restTemplate.getForObject("http://student-service/college/student/"   college.getClgId(),
                List.class);
        college.setStudents(student);
        return ResponseEntity.ok(college);
    }
}

application.yml

server:
  port: 9001
  
spring:
  application:
    name: college-service
    
eureka:
  instance:
    hostname: localhost

Student Service

Student Controller Entity

public class Student {
    private Long stId;
    private String stName;
    private String stEmail;
    private String clgId;

    public Student(Long stId, String stName, String stEmail, String clgId) {
        super();
        this.stId = stId;
        this.stName = stName;
        this.stEmail = stEmail;
        this.clgId = clgId;
    }

    // getter and setter
}

@RestController
@RequestMapping("/college")
public class StudentCotroller {

    @Autowired
    private StudentService studentService;

    @RequestMapping(value = "/student/{clgId}", method = RequestMethod.GET)
    public ResponseEntity<List<Student>> getStudents(@PathVariable("clgId") String clgId) {
        return ResponseEntity.ok(studentService.getStudents(clgId));
    }

}

application.yml

server:
  port: 9002
  
spring:
  application:
    name: student-service
    
eureka:
  instance:
    hostname: localhost

Eureka Server

application.yml

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0

API Gateway Service

application.yml

server:
  port: 9003
  
eureka:
  instance:
    hostname: localhost

spring:
  application:
    name: api-gateway
  cloud:
    gateway:
      routes:
      - id: college-service
        uri: lb://college-service
        predicates:
        - Path=/college/**
      - id: student-service
        uri: lb://student-service
        predicates:
        - Path=/student/**

CodePudding user response：

Predicate for your student-service is to match all the requests that start with student(Path=/student/**). However you are you calling the student-service with the request that starts with college(/college/student/CLG01). This request will me matched to college-service since you set the predicate for this service as Path=/college/**. /college/** path matches /college/student/CLG01 path.

Possible solutions:

1. Change your StudentController request mapping from /college to /student
2. Use different predicate for your student service, such as Host
3. Set specific path predicate and change the order of routes:

     routes:
      - id: student-service
        uri: lb://student-service
        predicates:
        - Path=/college/student/**
      - id: college-service
        uri: lb://college-service
        predicates:
        - Path=/college/**