Code

service------------------------------------------------------------------------------------------------------------------------------
package br.com.fusionconsultoria.services;

import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.Random;

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

import br.com.fusionconsultoria.daos.DAOZFIT005;

@Path("/Authentication")
public class SERVICEZFIT000 {
	/*
	 * @POST
	 *
	 * @Produces("application/json")
	 *
	 * @Consumes("application/json") public Response
	 * authenticateUser(BEANCredential credentials) {
	 *
	 * String username = credentials.getUsername(); String password =
	 * credentials.getPassword();
	 */
	@POST
	@Produces(MediaType.APPLICATION_JSON)
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	public Response authenticateUser(@FormParam("username") String username, @FormParam("password") String password) {
		try {
			// Authenticate the user using the credentials provided
			boolean login = authenticate(username, password);
			if (login == true) {
				// Issue a token for the user
				String token = issueToken(username);
				// Save the token in DB
				DAOZFIT005 fiveDAO = new DAOZFIT005();
				boolean update = fiveDAO.updateZITOKEN(username, token);
				if (update == true) {
					// Return the token on the response
					return Response.ok(token).build();
				} else {
					return Response.status(Response.Status.UNAUTHORIZED).build();
				}
			} else {
				return Response.status(Response.Status.UNAUTHORIZED).build();
			}
		} catch (Exception e) {
			return Response.status(Response.Status.UNAUTHORIZED).build();
		}
	}

	private boolean authenticate(String username, String password) throws Exception {
		DAOZFIT005 fiveDAO = new DAOZFIT005();
		boolean login = fiveDAO.login(username, password);
		return login;
	}

	private String issueToken(String username) {
		Random random = new SecureRandom();
		String token = new BigInteger(130, random).toString(32);
		return token;
	}
}
bean---------------------------------------------------------------------------------------------------------------------------------
package br.com.fusionconsultoria.beans;

import java.io.Serializable;

public class BEANCredential implements Serializable {
	private static final long serialVersionUID = 1L;

	private String username;
	private String password;
	private String token;

	public String getToken() {
		return token;
	}

	public void setToken(String token) {
		this.token = token;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}
}
pom.xml------------------------------------------------------------------------------------------------------------------------------
<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>InBettaWS</groupId>
	<artifactId>InBettaWS</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<build>
		<sourceDirectory>src</sourceDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>3.0.0</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-core-asl</artifactId>
			<version>1.9.2</version>
		</dependency>
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-core-asl</artifactId>
			<version>1.9.13</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2.external</groupId>
			<artifactId>aopalliance-repackaged</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>org.ow2.asm</groupId>
			<artifactId>asm-debug-all</artifactId>
			<version>6.0_ALPHA</version>
		</dependency>
		<dependency>
			<groupId>com.owlike</groupId>
			<artifactId>genson</artifactId>
			<version>1.4</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2</groupId>
			<artifactId>hk2-api</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2</groupId>
			<artifactId>hk2-locator</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2</groupId>
			<artifactId>hk2-utils</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-mapper-asl</artifactId>
			<version>1.9.13</version>
		</dependency>
		<dependency>
			<groupId>org.javassist</groupId>
			<artifactId>javassist</artifactId>
			<version>3.22.0-CR1</version>
		</dependency>
		<dependency>
			<groupId>javax.annotation</groupId>
			<artifactId>javax.annotation-api</artifactId>
			<version>1.3</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2.external</groupId>
			<artifactId>javax.inject</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>4.0.0-b03</version>
		</dependency>
		<dependency>
			<groupId>javax.ws.rs</groupId>
			<artifactId>javax.ws.rs-api</artifactId>
			<version>2.1-m05</version>
		</dependency>
		<dependency>
			<groupId>javax.xml.bind</groupId>
			<artifactId>jaxb-api</artifactId>
			<version>2.3.0-b170201.1204</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.core</groupId>
			<artifactId>jersey-client</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.core</groupId>
			<artifactId>jersey-common</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.containers</groupId>
			<artifactId>jersey-container-servlet-core</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.bundles.repackaged</groupId>
			<artifactId>jersey-guava</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.media</groupId>
			<artifactId>jersey-media-jaxb</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.core</groupId>
			<artifactId>jersey-server</artifactId>
			<version>2.26-b02</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.jersey.media</groupId>
			<artifactId>jersey-media-json-jackson</artifactId>
			<version>2.17</version>
		</dependency>

		<dependency>
			<groupId>org.osgi</groupId>
			<artifactId>org.osgi.core</artifactId>
			<version>6.0.0</version>
		</dependency>
		<dependency>
			<groupId>org.glassfish.hk2</groupId>
			<artifactId>osgi-resource-locator</artifactId>
			<version>2.5.0-b35</version>
		</dependency>
		<dependency>
			<groupId>javax.persistence</groupId>
			<artifactId>persistence-api</artifactId>
			<version>1.0.2</version>
		</dependency>
		<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
			<version>2.0.0.Alpha1</version>
		</dependency>
	</dependencies>
</project>
web.xml------------------------------------------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>InBettaWS</servlet-name>
		<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
		<init-param>
			<param-name>jersey.config.server.provider.packages</param-name>
			<param-value>br.com.fusionconsultoria.filters, br.com.fusionconsultoria.daos, br.com.fusionconsultoria.services, br.com.fusionconsultoria.beans, br.com.fusionconsultoria.annotations, com.jersey.jaxb, com.fasterxml.jackson.jaxrs.json</param-value>
		</init-param>
		<init-param>
			<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
			<param-value>true</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>InBettaWS</servlet-name>
		<url-pattern>/*</url-pattern>
	</servlet-mapping>
</web-app>