Why do I get 404 Not Found in Spring Boot

My Spring Boot application sends data through REST API. I connects to many Google Cloud components: google pubsub, mqtt server and google SQL. Since I implemented PUBSUB and MQTT, whenever I send a request from Postman I receive

My pom.xml configuration looks like this

    <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.6.6</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.company</groupId>
<artifactId>bftConfiguration</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>bftConfiguration</name>
<description>Demo project for Spring Boot</description>
<properties>
    <java.version>17</java.version>
    <spring-cloud-gcp.version>3.1.0</spring-cloud-gcp.version>
    <spring-cloud.version>2021.0.2-SNAPSHOT</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-integration</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-mqtt</artifactId>
        <version>5.5.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>spring-cloud-gcp-starter-pubsub</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-core</artifactId>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>

    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>commons-cli</groupId>
        <artifactId>commons-cli</artifactId>
        <version>1.3.1</version>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>spring-cloud-gcp-dependencies</artifactId>
            <version>${spring-cloud-gcp.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>
            <configuration>
                <excludes>
                    <exclude>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                    </exclude>
                </excludes>
            </configuration>

        </plugin>
    </plugins>
</build>
<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <releases>
            <enabled>false</enabled>
        </releases>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </pluginRepository>
    <pluginRepository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <releases>
            <enabled>false</enabled>
        </releases>
    </pluginRepository>
</pluginRepositories>

JavaScript
​x
 
    <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>2.6.6</version>    <relativePath/> <!-- lookup parent from repository --></parent><groupId>com.company</groupId><artifactId>bftConfiguration</artifactId><version>0.0.1-SNAPSHOT</version><name>bftConfiguration</name><description>Demo project for Spring Boot</description><properties>    <java.version>17</java.version>    <spring-cloud-gcp.version>3.1.0</spring-cloud-gcp.version>    <spring-cloud.version>2021.0.2-SNAPSHOT</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-integration</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-actuator</artifactId>    </dependency>    <dependency>        <groupId>com.google.code.gson</groupId>        <artifactId>gson</artifactId>    </dependency>    <dependency>        <groupId>io.jsonwebtoken</groupId>        <artifactId>jjwt</artifactId>        <version>0.9.1</version>    </dependency>    <dependency>        <groupId>org.springframework.integration</groupId>        <artifactId>spring-integration-mqtt</artifactId>        <version>5.5.9</version>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-jdbc</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <dependency>        <groupId>com.google.cloud</groupId>        <artifactId>spring-cloud-gcp-starter-pubsub</artifactId>    </dependency>​    <dependency>        <groupId>org.springframework.integration</groupId>        <artifactId>spring-integration-core</artifactId>    </dependency>​    <dependency>        <groupId>org.projectlombok</groupId>        <artifactId>lombok</artifactId>        <optional>true</optional>​    </dependency>    <dependency>        <groupId>mysql</groupId>        <artifactId>mysql-connector-java</artifactId>    </dependency>    <dependency>        <groupId>joda-time</groupId>        <artifactId>joda-time</artifactId>        <version>2.2</version>    </dependency>    <dependency>        <groupId>commons-cli</groupId>        <artifactId>commons-cli</artifactId>        <version>1.3.1</version>    </dependency></dependencies><dependencyManagement>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-dependencies</artifactId>            <version>${spring-cloud.version}</version>            <type>pom</type>            <scope>import</scope>        </dependency>        <dependency>            <groupId>com.google.cloud</groupId>            <artifactId>spring-cloud-gcp-dependencies</artifactId>            <version>${spring-cloud-gcp.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>            <configuration>                <excludes>                    <exclude>                        <groupId>org.projectlombok</groupId>                        <artifactId>lombok</artifactId>                    </exclude>                </excludes>            </configuration>​        </plugin>    </plugins></build><repositories>    <repository>        <id>spring-milestones</id>        <name>Spring Milestones</name>        <url>https://repo.spring.io/milestone</url>        <snapshots>            <enabled>false</enabled>        </snapshots>    </repository>    <repository>        <id>spring-snapshots</id>        <name>Spring Snapshots</name>        <url>https://repo.spring.io/snapshot</url>        <releases>            <enabled>false</enabled>        </releases>    </repository></repositories><pluginRepositories>    <pluginRepository>        <id>spring-milestones</id>        <name>Spring Milestones</name>        <url>https://repo.spring.io/milestone</url>        <snapshots>            <enabled>false</enabled>        </snapshots>    </pluginRepository>    <pluginRepository>        <id>spring-snapshots</id>        <name>Spring Snapshots</name>        <url>https://repo.spring.io/snapshot</url>        <releases>            <enabled>false</enabled>        </releases>    </pluginRepository></pluginRepositories>​

I also found that request is being served by backend to the point of return, so if backend throws an Exception during request processing, it returns 500 Internal Server error

Even the record is being inserted to database

Hibernate: insert into rfid_reader (antennas, created_at, device_id, duration, freqmhz, is_deleted, is_temporary, mode, population, powerdbm, search_mode, session, updated_at, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

JavaScript
 
Hibernate: insert into rfid_reader (antennas, created_at, device_id, duration, freqmhz, is_deleted, is_temporary, mode, population, powerdbm, search_mode, session, updated_at, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)​

This is my controller

@Controller
@CrossOrigin
@RequiredArgsConstructor
@RequestMapping("/rfid")
public class RfidReaderController {

final RfidReaderService rfidReaderService;

@ResponseStatus(HttpStatus.OK)
@GetMapping("/get")
public RfidReaderDTO getRfidReader(@PathVariable UUID id){
    return rfidReaderService.getRfidReader(id);
}

@ResponseStatus(HttpStatus.OK)
@GetMapping("/getByDevice/{deviceId}")
public List<RfidReaderDTO> getAllRfidReaders(@PathVariable("deviceId") String id){
    return rfidReaderService.getRfidReaderOptionsByDevice(id);
}
@ResponseStatus(HttpStatus.CREATED)
@PostMapping("/add")
public RfidReaderDTO addRfid(@RequestBody RfidPostDTO input) throws MqttException, IOException, NoSuchAlgorithmException, InvalidKeySpecException, InterruptedException {
    return rfidReaderService.addReaderSettings(input.getDeviceId(),input.getPowerDBm(),input.getFreqMHz(), input.getMode(), input.getSession(), input.getPopulation(), input.getDuration(), input.getSearchMode(),input.getAntennas());
}

}

JavaScript
 
@Controller@CrossOrigin@RequiredArgsConstructor@RequestMapping("/rfid")public class RfidReaderController {​final RfidReaderService rfidReaderService;​@ResponseStatus(HttpStatus.OK)@GetMapping("/get")public RfidReaderDTO getRfidReader(@PathVariable UUID id){    return rfidReaderService.getRfidReader(id);}​@ResponseStatus(HttpStatus.OK)@GetMapping("/getByDevice/{deviceId}")public List<RfidReaderDTO> getAllRfidReaders(@PathVariable("deviceId") String id){    return rfidReaderService.getRfidReaderOptionsByDevice(id);}@ResponseStatus(HttpStatus.CREATED)@PostMapping("/add")public RfidReaderDTO addRfid(@RequestBody RfidPostDTO input) throws MqttException, IOException, NoSuchAlgorithmException, InvalidKeySpecException, InterruptedException {    return rfidReaderService.addReaderSettings(input.getDeviceId(),input.getPowerDBm(),input.getFreqMHz(), input.getMode(), input.getSession(), input.getPopulation(), input.getDuration(), input.getSearchMode(),input.getAntennas());}​}​

here’s stack trace when 500 is returned

java.lang.NullPointerException: Cannot invoke "org.eclipse.paho.client.mqttv3.MqttClient.publish(String, org.eclipse.paho.client.mqttv3.MqttMessage)" because "com.company.bftConfiguration.mqtt.MqttClientConnector.client" is null
at com.company.bftConfiguration.service.RfidReaderService.addReaderSettings(RfidReaderService.java:122) ~[classes/:na]
at com.company.bftConfiguration.controller.RfidReaderController.addRfid(RfidReaderController.java:41) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.18.jar:5.3.18]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.18.jar:5.3.18]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:681) ~[tomcat-embed-core-9.0.60.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.18.jar:5.3.18]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.60.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at com.company.bftConfiguration.cors.CORSFilter.doFilter(CORSFilter.java:40) ~[classes/:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) ~[spring-boot-actuator-2.6.6.jar:2.6.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.18.jar:5.3.18]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.60.jar:9.0.60]
at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

JavaScript
 
java.lang.NullPointerException: Cannot invoke "org.eclipse.paho.client.mqttv3.MqttClient.publish(String, org.eclipse.paho.client.mqttv3.MqttMessage)" because "com.company.bftConfiguration.mqtt.MqttClientConnector.client" is nullat com.company.bftConfiguration.service.RfidReaderService.addReaderSettings(RfidReaderService.java:122) ~[classes/:na]at com.company.bftConfiguration.controller.RfidReaderController.addRfid(RfidReaderController.java:41) ~[classes/:na]at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.18.jar:5.3.18]at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.18.jar:5.3.18]at javax.servlet.http.HttpServlet.service(HttpServlet.java:681) ~[tomcat-embed-core-9.0.60.jar:4.0.FR]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.18.jar:5.3.18]at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.60.jar:4.0.FR]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at com.company.bftConfiguration.cors.CORSFilter.doFilter(CORSFilter.java:40) ~[classes/:na]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) ~[spring-boot-actuator-2.6.6.jar:2.6.6]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.18.jar:5.3.18]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.18.jar:5.3.18]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.60.jar:9.0.60]at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]​

and here is the code snippet of that service

 public RfidReaderDTO addReaderSettings(
        String deviceId,
        Integer powerDBm,
        Double freqMHz,
        Integer mode,
        Integer session,
        Integer population,
        Integer duration,
        Integer searchMode,
        List<Integer> antennas
) throws IOException, MqttException, NoSuchAlgorithmException, InvalidKeySpecException, InterruptedException {
    Device device = deviceRepository.findDeviceByDeviceId(deviceId);
    OffsetDateTime dateTime = Date.getDateWithTimeZone();
    ReaderDefaultOptions readerDefaultOptions = new ReaderDefaultOptions();

    RfidReader reader = new RfidReader();
    reader.setPowerDBm(powerDBm != null ? powerDBm : readerDefaultOptions.getPowerDBm());
    reader.setFreqMHz(freqMHz != null ? freqMHz : readerDefaultOptions.getFreqMHz());

    reader.setMode(mode != null ? mode : readerDefaultOptions.getMode());

    reader.setSession(session != null ? session : readerDefaultOptions.getSession());

    reader.setPopulation(population != null ? population : readerDefaultOptions.getPopulation());

    reader.setDuration(duration != null ? duration : readerDefaultOptions.getDuration());

    reader.setSearchMode(searchMode != null ? searchMode : readerDefaultOptions.getSearchMode());

    reader.setAntennas(antennas != null ? antennas : readerDefaultOptions.getAntennas());
    reader.setDevice(device);
    reader.setCreatedAt(dateTime);
    reader.setUpdatedAt(dateTime);
    reader.setIsTemporary(true);
    rfidReaderRepository.save(reader);
    RfidReaderDTO rfidDTO = RfidReaderDTO.builder()
            .antennas(antennas)
            .duration(duration)
            .freqMHz(freqMHz)
            .isTemporary(true)
            .mode(mode)
            .searchMode(searchMode)
            .population(population)
            .powerDBm(powerDBm)
            .session(session)
            .build();
    String rfidJson = new Gson().toJson(rfidDTO);
    MqttClientConnector connector = new MqttClientConnector();
    MqttMessage mqttMessage = new MqttMessage("state".getBytes(StandardCharsets.UTF_8));
    MqttClientConnector.client.publish("dsa",mqttMessage);
    connector.publishData(rfidJson);
    messagingGateway.sendToPubsub(rfidJson);
    return rfidDT

JavaScript
 
 public RfidReaderDTO addReaderSettings(        String deviceId,        Integer powerDBm,        Double freqMHz,        Integer mode,        Integer session,        Integer population,        Integer duration,        Integer searchMode,        List<Integer> antennas) throws IOException, MqttException, NoSuchAlgorithmException, InvalidKeySpecException, InterruptedException {    Device device = deviceRepository.findDeviceByDeviceId(deviceId);    OffsetDateTime dateTime = Date.getDateWithTimeZone();    ReaderDefaultOptions readerDefaultOptions = new ReaderDefaultOptions();​    RfidReader reader = new RfidReader();    reader.setPowerDBm(powerDBm != null ? powerDBm : readerDefaultOptions.getPowerDBm());    reader.setFreqMHz(freqMHz != null ? freqMHz : readerDefaultOptions.getFreqMHz());​    reader.setMode(mode != null ? mode : readerDefaultOptions.getMode());​    reader.setSession(session != null ? session : readerDefaultOptions.getSession());​    reader.setPopulation(population != null ? population : readerDefaultOptions.getPopulation());​    reader.setDuration(duration != null ? duration : readerDefaultOptions.getDuration());​    reader.setSearchMode(searchMode != null ? searchMode : readerDefaultOptions.getSearchMode());​    reader.setAntennas(antennas != null ? antennas : readerDefaultOptions.getAntennas());    reader.setDevice(device);    reader.setCreatedAt(dateTime);    reader.setUpdatedAt(dateTime);    reader.setIsTemporary(true);    rfidReaderRepository.save(reader);    RfidReaderDTO rfidDTO = RfidReaderDTO.builder()            .antennas(antennas)            .duration(duration)            .freqMHz(freqMHz)            .isTemporary(true)            .mode(mode)            .searchMode(searchMode)            .population(population)            .powerDBm(powerDBm)            .session(session)            .build();    String rfidJson = new Gson().toJson(rfidDTO);    MqttClientConnector connector = new MqttClientConnector();    MqttMessage mqttMessage = new MqttMessage("state".getBytes(StandardCharsets.UTF_8));    MqttClientConnector.client.publish("dsa",mqttMessage);    connector.publishData(rfidJson);    messagingGateway.sendToPubsub(rfidJson);    return rfidDT​

I am not interested in the error, I know why it is being thrown. I want to figure out why response returns 404 when the endpoint exists.

Answer

Ok, so the issue was very silly, and the solution is super simple:

I was using @Controller adnotation in my RfidReaderController which is from springframework.stereotype library. I changed it to @RestController and now it works. just as follows:

@Controller
@CrossOrigin
@RequiredArgsConstructor
@RequestMapping("/rfid")
public class RfidReaderController {
...

JavaScript
 
@Controller@CrossOrigin@RequiredArgsConstructor@RequestMapping("/rfid")public class RfidReaderController {...​

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Answer