JAX-RS not responding at all (404) - eclipse

Question

I'm using Eclipse 2020-03, Gradle and Tomcat. all I did follows.
Installing gradle through eclipse marketplace.
making gradle project.
adding those on build.gradle dependencies
dependencies {
// This dependency is exported to consumers, that is to say found on their compile classpath.
api 'org.apache.commons:commons-math3:3.6.1'
// This dependency is used internally, and not exposed to consumers on their own compile classpath.
implementation 'com.google.guava:guava:28.2-jre'
// Use JUnit test framework
testImplementation 'junit:junit:4.12'
compile 'org.glassfish.jersey.containers:jersey-container-servlet:2.27'
compile group: 'org.glassfish.jersey.inject', name: 'jersey-hk2', version: '2.27'
compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.4.0-b180830.0359'
compile group: 'org.glassfish.jersey.media', name: 'jersey-media-json-jackson', version: '2.27'
}
adding "rest" package on src/main/java
adding ApplicationConfig.java and RestApiService.java on rest package.
ApplicationConfig.java
package rest;
import java.util.HashMap;
import java.util.Map;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
#ApplicationPath("/api")
public class ApplicationConfig extends Application {
#Override
public Map<String, Object> getProperties(){
Map<String, Object> properties = new HashMap<String, Object>();
properties.put("jersey.config.server.provider.packages", "A_UnivG.rest");
return properties;
}
}
RestApiService.java
package rest;
import java.util.logging.Logger;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import Data.*;
#Path("/Data")
public class RestApiService {
Logger logger = Logger.getLogger("RestApiService");
IntegrationDAO dao = new IntegrationDAO();
#GET
#Path("hello")
#Produces(MediaType.TEXT_PLAIN)
public String getHello() {return "Hello";}
}
and when I try to request http://localhost:portnumber/A_UnivG/api/Data/hello it spits out only 404 error.
cannot figure out why.
My project works with plain jsp files. I have a JSP page which uses DAO Read but it works just fine. well, that shouldn't be a problem I just tried hello world and it doesn't work at all.