GET request is not answered correctly by the backend

The project is an Angular 6 front end, which connects to a Java back-end for communication with a SQL Server BD.

The server that receives the file .war , containing the back as the front, is Tomcat 8.5.32.

The structure for logging in follows four files:

@RestController
@RequestMapping(value = "/api")
public class AuthController {

public static final Logger logger = LoggerFactory.getLogger(AuthController.class);

@CrossOrigin
@RequestMapping("/auth")
public Principal user(Principal principal) {
    logger.info("usuário logado " + principal);
    return principal;
  }
}

@Transactional
public interface LoginRepository  extends JpaRepository<Login, Long>{
    Login findOneByUsername(String username);
}

@Service
public class UserService {
  @Autowired
  LoginRepository userRepository;

  public Login save(Login user) {
     return userRepository.saveAndFlush(user);
  }

  public Login update(Login user) {
     return userRepository.save(user);
  }

  public Login find(String userName) {
     return userRepository.findOneByUsername(userName);
  }

  public Login find(Long id) {
     return userRepository.findOne(id);
  }

}

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

@Autowired
UserService userService;

@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    Login user = userService.find(username);
    return user;
  }

}

When sending a GET request to the endpoint /api/auth in the development environment, with the server running in the spring-boot, the login follows without problems, receiving the main object and then logging in.

When I move to the format war with the appropriate adaptations, tests I have done show that the requests for the other tables follow without problem, except Login, which accesses the database and searches for the credential, but does not returns the Main object, but a 404 error.

EDIT

Excerpts from pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.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>
    <start-class>br.com.tradeturismo.ServletInitialzer</start-class>
    <maven.build.timestamp.format>ddMMyyyyHHmmss</maven.build.timestamp.format>
    <angular.project.location>portal</angular.project.location>
    <angular.project.nodeinstallation>node_installation</angular.project.nodeinstallation>
</properties>
<build>
    <plugins>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>com.github.eirslett</groupId>
            <artifactId>frontend-maven-plugin</artifactId>
            <version>1.6</version>
            <configuration>
                <workingDirectory>${angular.project.location}</workingDirectory>
                <installDirectory>${angular.project.nodeinstallation}</installDirectory>
            </configuration>
            <executions>
                <execution>
                    <id>install node and npm</id>
                    <goals>
                        <goal>install-node-and-npm</goal>
                    </goals>
                    <configuration>
                        <nodeVersion>v10.6.0</nodeVersion>
                        <npmVersion>6.1.0</npmVersion>
                    </configuration>
                </execution>

                <execution>
                    <id>npm install</id>
                    <goals>
                        <goal>npm</goal>
                    </goals>
                    <configuration>
                        <arguments>install</arguments>
                    </configuration>
                </execution>

                <execution>
                    <id>npm build</id>
                    <goals>
                        <goal>npm</goal>
                    </goals>
                    <configuration>
                        <arguments>run build</arguments>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <version>3.1.0</version>
            <executions>
                <execution>
                    <id>default-copy-resources</id>
                    <phase>process-resources</phase>
                    <goals>
                        <goal>copy-resources</goal>
                    </goals>
                    <configuration>
                        <overwrite>false</overwrite>
                        <outputDirectory>${project.build.directory}/${project.artifactId}-${project.version}/</outputDirectory>
                        <resources>
                            <resource>
                                <directory>${project.basedir}/${angular.project.location}/dist</directory>
                                <includes>
                                    <include>**/*.*</include>
                                </includes>
                            </resource>
                        </resources>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>