I want to return a Map with 2 members to web client: One member is a list
of Post, and the other is a Map of User. Of course, I can define a class
with these 2 members, and it realy works. But I want to try a more general
solution for GWT-RPC parameters/results transferring.
So far, I tried this solution on 2.5rc1. It works but with warning like
below,anybody knows how to resolve it, or I really should forget this way
to transfer objects between client and server if you know the reason.
Thanks.
[DEBUG] [ gwtLearning ] - Rebinding com.learn.client.GreetingService
[DEBUG] [ gwtLearning ] - Invoking generator
com.google.gwt.user.rebind.rpc.ServiceInterfaceProxyGenerator
[DEBUG] [ gwtLearning ] - Generating client proxy for remote service
interface 'com.learn.client.GreetingService'
[DEBUG] [ gwtLearning ] - Analyzing 'com.learn.client.GreetingService'
for serializable types
[DEBUG] [ gwtLearning ] - Analyzing methods:
[DEBUG] [ gwtLearning ] - public abstract java.util.Map
postWithUserServer() throws java.lang.IllegalArgumentException
[DEBUG] [ gwtLearning ] - Return type: java.util.Map
[DEBUG] [ gwtLearning ] - java.util.Map
[DEBUG] [ gwtLearning ] - Verifying instantiability
[DEBUG] [ gwtLearning ] - java.util.HashMap<? extends
java.lang.Object, ? extends java.lang.Object>
[WARN] [ gwtLearning ] - Checking all subtypes of Object which
qualify for serialization
[DEBUG] [ gwtLearning ] -
com.google.gwt.validation.client.impl.PathImpl
[DEBUG] [ gwtLearning ] - Verifying instantiability
[DEBUG] [ gwtLearning ] -
com.google.gwt.validation.client.impl.PathImpl
[DEBUG] [ gwtLearning ] - Analyzing the fields of type
'com.google.gwt.validation.client.impl.PathImpl' that qualify for
serialization
[WARN] [ gwtLearning ] - Field 'private final
java.util.List<javax.validation.Path.Node> nodes' will not be serialized
because it is final
=============================================
public interface GreetingService extends RemoteService {
Map postWithUserServer() throws IllegalArgumentException;
}
public interface GreetingServiceAsync {
void postWithUserServer(AsyncCallback<Map> callback)
throws IllegalArgumentException;
}
public class GreetingServiceImpl extends RemoteServiceServlet implements
GreetingService {
@Override
public Map postWithUserServer() throws IllegalArgumentException {
*List<Post> lPos*t=Arrays.asList(new Post(2),new Post(3),new Post(4),new
Post(5),new Post(6),new Post(7)
,new Post(8),new Post(9),new Post(10),new Post(11),new Post(12),new
Post(13));
*Map<Integer,User> mUser*=new TreeMap<Integer,User>();
mUser.put(1, new User(1));
mUser.put(2, new User(2));
mUser.put(3, new User(3));
*Map mResult* = new TreeMap();
mResult.put("posts", lPost);
mResult.put("users", mUser);
return mResult;
}
}
public class GwtImage implements EntryPoint {
private final GreetingServiceAsync greetingService =
GWT.create(GreetingService.class);
public void onModuleLoad() {
final CellList<String> clPostWithUser = new CellList<String>(new
TextCell());
Button btnShowPostWithUser = new Button("Show Post With User",new
ClickHandler(){
@Override
public void onClick(ClickEvent event) {
greetingService.postWithUserServer(new AsyncCallback<Map>(){
@Override
public void onFailure(Throwable caught) {
Window.alert("get result failed!");
}
@Override
public void onSuccess(Map mResult) {
List<Post> lShowPosts =(List<Post>) mResult.get("posts");
Map<Integer,User> mShowUsers = (TreeMap<Integer,User>) mResult.get("users");
List<String> lShowResult = new ArrayList<String>();
User uShow;
for(Post pShow:lShowPosts){
uShow=mShowUsers.get(pShow.pid%3+1);
lShowResult.add(pShow.pid+":"+pShow.title+":"+pShow.body+" from " +
uShow.uid +"/" + uShow.name + "/" + uShow.nickName);
}
clPostWithUser.setRowData(lShowResult);
}
});
}
});
RootPanel.get().add(btnShowPostWithUser);
RootPanel.get().add(clPostWithUser);
}
}
public class User implements Serializable{
private static final long serialVersionUID = 1L;
public int uid;
public String name;
public String nickName;
public User(){}
public User(int i){
uid=i;
name="name "+String.valueOf(i);
nickName="nickName "+String.valueOf(i);
}
}
public class Post implements Serializable{
private static final long serialVersionUID = 1L;
public int pid;
public String title;
public String body;
public Post() {}
public Post(int i) {
pid=i;
title="title "+String.valueOf(i);
body="body "+String.valueOf(i);
}
}
--
Gong Min
[email protected]
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