Question

I am trying to send over MyClass through RPC, but am getting :
Type MyClass was not assignable to ‘com.google.gwt.user.client.rpc.IsSerializable’ and did not have a custom field serializer.For security purposes, this type will not be serialized.

I have looked at GWT – occasional com.google.gwt.user.client.rpc.SerializationException and tried their solution, but it did not work.

The difference is that MyClass is located in another project.
The project structure is:

MyApiProject
-contains MyClass
MyClientProject
MyServerProject

I have also tried passing an enum through the RPC from MyApiProject, which also failed.

public class MyClass
    implements Serializable
{
    private static final long serialVersionUID = 5258129039653904120L;

    private String str;

    private MyClass()
    {
    }

    public MyClass(String str)
    {
        this.str = str;
    }

    public String getString()
    {
        return this.str;
    }
}

in the RemoteService I have:

mypackage.MyClass getMyClass();

in the RemoteServiceAsync I have:

void getMyClass(AsyncCallback<mypackage.MyClass> callback);

Answer 1

I had to change implements Serializable to implements IsSerializable