Hello,
We have problems serializing generic Maps in gwt-1.6.2 (both in web
and hosted mode). It seems that type parameters of generic remote
service method parameters are not scanned properly when searching for
potential serializable types.
To reproduce the problem, please see the application snippet below. It
is a minimal GWT application which calls a remote service from its
entry method.
Running the application results in the following exception:
[ERROR] failure
com.google.gwt.user.client.rpc.SerializationException:
gwtsandbox.client.Parameter
at
gwtsandbox.client.Service_TypeSerializer.raiseSerializationException
(Service_TypeSerializer.java:69)
at gwtsandbox.client.Service_TypeSerializer.serialize(Native Method)
at
com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize
(ClientSerializationStreamWriter.java:216)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at
com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize
(Map_CustomFieldSerializerBase.java:50)
at
com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize
(HashMap_CustomFieldSerializer.java:36)
at gwtsandbox.client.Service_TypeSerializer.serialize(Native Method)
at
com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize
(ClientSerializationStreamWriter.java:216)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at gwtsandbox.client.Service_Proxy.serviceMethod(Service_Proxy.java:
31)
at gwtsandbox.client.Application.onModuleLoad(Application.java:20)
Uncommenting the lines marked with "// FIX", it works as expected.
I think it is a bug, what do you think?
Thanks for your help!
Regards:
Norbi
Application.gwt.xml
-------------------
<module>
<inherits name='com.google.gwt.user.User' />
<entry-point class='gwtsandbox.client.Application' />
<source path="client" />
</module>
Application.java
----------------
package gwtsandbox.client;
import java.util.HashMap;
import java.util.Map;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
public class Application implements EntryPoint {
public void onModuleLoad() {
Map<String, Object> map = new HashMap<String, Object>();
map.put("key", new Parameter(5));
ServiceAsync serviceProxy = GWT.create(Service.class);
((ServiceDefTarget) serviceProxy).setServiceEntryPoint
(GWT.getHostPageBaseURL() + "gwt/rpc/"
+ Service.class.getName());
serviceProxy.serviceMethod(map, new AsyncCallback<Void>() {
@Override
public void onFailure(Throwable caught) {
Window.alert(caught.toString());
System.out.println(caught);
}
@Override
public void onSuccess(Void result) {
Window.alert("success");
}
});
}
}
Parameter.java
--------------
package gwtsandbox.client;
import java.io.Serializable;
import com.google.gwt.user.client.rpc.IsSerializable;
public class Parameter implements Serializable, IsSerializable {
private static final long serialVersionUID = 1L;
private int value;
public Parameter() {
}
public Parameter(int value) {
setValue(value);
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
Service.java
------------
package gwtsandbox.client;
import java.util.Map;
import com.google.gwt.user.client.rpc.RemoteService;
public interface Service extends RemoteService {
void serviceMethod(Map<String, Object> map);
// FIX void serviceMethod(Parameter parameter);
}
ServiceAsync.java
-----------------
package gwtsandbox.client;
import java.util.Map;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface ServiceAsync {
void serviceMethod(Map<String, Object> map, AsyncCallback<Void>
callback);
// FIX void serviceMethod(Parameter parameter, AsyncCallback<Void>
callback);
}
ServiceServlet.java
-------------------
package gwtsandbox.server;
import java.util.Map;
import gwtsandbox.client.Parameter;
import gwtsandbox.client.Service;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
public class ServiceServlet extends RemoteServiceServlet implements
Service {
private static final long serialVersionUID = 1L;
@Override
public void serviceMethod(Map<String, Object> map) {
System.out.println("Service called: " + map);
}
// FIX @Override
public void serviceMethod(Parameter parameter) {
System.out.println("Service called: " + parameter);
}
}
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"; xmlns:web="http://
java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";
id="WebApp_ID" version="2.5">
<display-name>gwt-sandbox</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Service</servlet-name>
<servlet-class>gwtsandbox.server.ServiceServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Service</servlet-name>
<url-pattern>/gwt/rpc/gwtsandbox.client.Service</url-pattern>
</servlet-mapping>
</web-app>
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