Spring Boot - PostMapping does not working

Question

I am developing spring boot api project. @PostMapping annotation does not running. Why? I added breakpoint but not stopping?? Please help.

pom.xml

...
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
    </dependencies>

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

ApplicationUser.java

public class ApplicationUser {
    private long id;
    private String name;

    // constructors, getters-setters
}

ApplicationUserController.java

@RestController
@RequestMapping("/api/v1/users")
public class ApplicationUserController {
    public static final List<ApplicationUser> USERS = Arrays.asList(
        new ApplicationUser(1, "Jeff"),
        new ApplicationUser(2, "Mark"),
        new ApplicationUser(3, "Bill")
    );

    @GetMapping(value="/{userId}", produces="application/json")
    public ResponseEntity<ApplicationUser> getUser(@PathVariable("userId") Long userId) {
        return ResponseEntity.ok(
            USERS.stream()
            .filter(user -> userId.equals(user.getId()))
            .findFirst()
            .orElseThrow(() -> new IllegalStateException(
                "User " + userId + "does not exists"
            ))
        );
    }

    @PostMapping(value="/add", consumes="application/json")
    public void addUser(@RequestBody ApplicationUser user) {
        for (long i = 0L; i < USERS.size(); i++)
            if (user.getId() == USERS.get((int)i).getId())
                throw new IllegalStateException("User " + user.getId() + " already exists");
        
        USERS.add(user);
    }
}

ApplicationSecurityConfig.java

@Configuration
@EnableWebSecurity
public class ApplicationSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .anyRequest()
            .authenticated()
            .and()
            .httpBasic();
    }
}

I tried following command

~$ curl http://localhost:8080/api/v1/users/add -X POST -H 'Content-type: application/json' -d '{"id": 4, "name": "Steve"}' -u user:-spring-security-password-
(no response)

After was running above command, i tried followings

~$ curl http://localhost:8080/api/v1/users/1 -u user:-spring-security-password-
{"id":1,"name":"Jeff"}

~$ curl http://localhost:8080/api/v1/users/4 -u user:-spring-security-password-
{"timestamp":"2021-01-20T19:53:19.205+00:00","status":500,"error":"Internal Server Error","message":"","path":"/api/v1/users/4"}

-- Edit --

I tried POST request with Postman, gets 401 Unauthorized . When try GET request, runs properly.

Answer 1

List returned by Arrays.asList() does not support add() . If you still try to add, then it will throw UnsupportedOperationException .Try initializing a list as shown below.

public static final List<ApplicationUser> USERS = new ArrayList<>(Arrays.asList(
        new ApplicationUser(1, "Jeff"),
        new ApplicationUser(2, "Mark"),
        new ApplicationUser(3, "Bill")
    ));