Add support for the oldest possible servlet version

Author: FagnerMartinsBrack

README.md

@@ -2,7 +2,7 @@
 
 A simple Java API for handling cookies
 
-* Supports Java 6+
+* Supports Java 6+, Servlet 2.2+
 * [Unobtrusive](#json-data-binding) JSON Data Binding support
 * [RFC 6265](http://www.rfc-editor.org/rfc/rfc6265.txt) compliant
 * Enable [custom decoding](#converter)

pom.xml

@@ -139,8 +139,8 @@
   <dependencies>
     <dependency>
       <groupId>javax.servlet</groupId>
-      <artifactId>javax.servlet-api</artifactId>
-      <version>3.0.1</version>
+      <artifactId>servlet-api</artifactId>
+      <version>2.2</version>
       <scope>provided</scope>
     </dependency>
     <dependency>

src/main/java/org/jscookie/Cookies.java

@@ -248,9 +248,6 @@ private Attributes extend( AttributesDefinition... mergeables ) {
 	}
 
 	private void setCookie( String cookieValue, HttpServletResponse response ) {
-		if ( response.getHeaders( "Set-Cookie" ).contains( cookieValue ) ) {
-			return;
-		}
 		response.addHeader( "Set-Cookie", cookieValue );
 	}
 

src/test/java/org/jscookie/test/integration/encoding/CookiesEncodingIT.java

@@ -1,5 +1,6 @@
 package org.jscookie.test.integration.encoding;
 
+import java.io.File;
 import java.net.URL;
 import java.util.concurrent.TimeUnit;
 
@@ -36,7 +37,11 @@ public static Archive<?> createDeployment() {
 			.as( GenericArchive.class );
 
 		WebArchive war = IntegrationUtils.createCommonDeployment()
-			.merge( qunitFiles, "/", Filters.includeAll() );
+			.merge( qunitFiles, "/", Filters.includeAll() )
+			.addAsWebInfResource(
+				new File( "src/test/resources/web.xml" ),
+				"web.xml"
+			);
 
 		System.out.println( " ----- LOGGING THE FILES ADDED TO JBOSS" );
 		System.out.println( war.toString( true ) );

src/test/java/org/jscookie/test/integration/encoding/EncodingServlet.java

@@ -5,7 +5,6 @@
 import java.net.URLDecoder;
 
 import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -14,7 +13,6 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 
-@WebServlet( "/encoding" )
 public class EncodingServlet extends HttpServlet {
 	private static final long serialVersionUID = 1;
 	@Override

src/test/java/org/jscookie/test/integration/write/MultipleSetCookieServlet.java

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
+<web-app>
+  <servlet>
+    <servlet-name>encoding</servlet-name>
+    <servlet-class>org.jscookie.test.integration.encoding.EncodingServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>encoding</servlet-name>
+    <url-pattern>/encoding</url-pattern>
+  </servlet-mapping>
+  <servlet>
+    <servlet-name>multiple-set-cookie</servlet-name>
+    <servlet-class>org.jscookie.test.integration.write.MultipleSetCookieServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>multiple-set-cookie</servlet-name>
+    <url-pattern>/multiple-set-cookie</url-pattern>
+  </servlet-mapping>
+</web-app>