<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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>mtitek.rest.sample</groupId>
    <artifactId>mtitek-rest-sample</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-server</artifactId>
            <version>2.29.1</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.29.1</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
            <version>2.29.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
    </dependencies>
</project>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">

    <servlet>
        <servlet-name>MyServletContainer</servlet-name>

        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>

        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>mtitek.rest.sample.MyResourceConfig</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>MyServletContainer</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

package mtitek.rest.sample;

import org.glassfish.jersey.server.ResourceConfig;

public class MyResourceConfig extends ResourceConfig {
}

Note that for this case "MyResourceConfig" is useless as there's no specific code added to this class.
You can run your code without it, just replace its full path in the file "web.xml" by "org.glassfish.jersey.server.ResourceConfig".

package mtitek.rest.sample;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("rest/myEntity")
@Produces({ MediaType.APPLICATION_XML })
public class MyEntityRestAPI {
    @GET
    @Path("/")
    public Response getMyEntity() {
        MyEntity myEntity = new MyEntity();

        myEntity.setId("myEntity - id - 1");
        myEntity.setCode("myEntity - code - 1");
        myEntity.setDesc("myEntity - desc - 1");

        return Response.ok(myEntity).build();
    }
}

package mtitek.rest.sample;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

@XmlRootElement(name = "myEntity")
@XmlAccessorType(XmlAccessType.NONE)
public class MyEntity {
    @XmlAttribute(name = "id")
    private String id;

    @XmlElement(name = "code")
    private String code;

    @XmlTransient
    private String desc;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getCode() {
        return code;
    }

    public void setCode(final String code) {
        this.code = code;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }
}

Apache Maven: mvn clean package

Apache Tomcat: deploy the war file "mtitek-rest-sample-1.0.0-SNAPSHOT.war" in the folder "${TOMCAT_ROOT}/webapps/"

REST client tool: http://localhost:8080/mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity

Response:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<myEntity id="myEntity - id - 1">
    <code>myEntity - code - 1</code>
</myEntity>