fix(JWT-4345): upgrade to gwt 2.12.1 and adjust accordingly

Author: benjaminalbanese

example/src/main/java/org/jadice/gwt/spring/demo/Application.gwt.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.5.1//EN" 
-	"http://gwtproject.org/doctype/2.8.0/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.12.1//EN"
+	"http://gwtproject.org/doctype/2.12.1/gwt-module.dtd">
 <module rename-to="springdemo">
     <inherits name="com.google.gwt.user.User" />
 

example/src/main/java/org/jadice/gwt/spring/demo/client/TimeService.java

@@ -8,7 +8,7 @@
 
 @RemoteServiceRelativePath("time")
 public interface TimeService extends RemoteService {
-  public static class TimeResponse implements Serializable {
+  class TimeResponse implements Serializable {
     private static final long serialVersionUID = 1L;
 
     public TimeResponse() {
@@ -22,4 +22,4 @@ public TimeResponse(final Date date) {
   }
 
   TimeResponse getTime();
-}
+}

example/src/main/java/org/jadice/gwt/spring/demo/client/TimeServiceAsync.java

@@ -4,6 +4,7 @@
 
 import com.google.gwt.user.client.rpc.AsyncCallback;
 
+
 public interface TimeServiceAsync {
 
   void getTime(AsyncCallback<TimeResponse> callback);

example/src/main/java/org/jadice/gwt/spring/demo/server/DemoApplication.java

@@ -20,7 +20,7 @@
  */
 @SpringBootApplication
 
-// Activate GWT support specifiying the GWT module name for the entry point
+// Activate GWT support specifying the GWT module name for the entry point
 @EnableGWTSpringBootApplication("org.jadice.gwt.spring.demo.Application")
 
 // Activate scanning for RPC service servlets so that TimeServiceImpl is picked up

example/src/main/java/org/jadice/gwt/spring/demo/server/TimeServiceImpl.java

@@ -6,7 +6,8 @@
 
 import org.jadice.gwt.spring.demo.client.TimeService;
 
-import com.google.gwt.user.server.rpc.RemoteServiceServlet;
+import com.google.gwt.user.server.rpc.jakarta.RemoteServiceServlet;
+
 
 // Expose the RPC service at the desired URL
 @WebServlet(urlPatterns = "/springdemo/time")
@@ -20,4 +21,4 @@ public class TimeServiceImpl extends RemoteServiceServlet implements TimeService
   public TimeResponse getTime() {
     return new TimeResponse(new Date());
   }
-}
+}