Any guidance for the following problem would be appreciated.

I am in the process of converting an existing GWT 1.5 project to GWT
1.7 and getting the following error.

[ERROR] Type
'com.mycompany.web.client.UFOWebClientTree.MyTreeListener' was not
serializable and has no concrete serializable subtypes

Not sure how to fix this error.

All the classes listed below implement IsSerializable.

Not sure which class has to be fixed first.


 com.mycompany.web.client.UFOWebClientTable
      [ERROR] Type 'com.mycompany.web.client.UFOWebClientTable' was
not serializable and has no concrete serializable subtypes
     com.mycompany.web.client.UFOWebClientTree
     [ERROR] Type 'com.mycompany.web.client.UFOWebClientTree' was not
serializable and has no concrete serializable subtypes
     com.mycompany.web.client.UFOWebClientNodeTreeItem
      [ERROR] Type 'com.mycompany.web.client.UFOWebClientNodeTreeItem'
was not serializable and has no concrete serializable subtypes
       com.mycompany.web.client.UFOWebClientTree.MyTreeListener
     [ERROR] Type
'com.mycompany.web.client.UFOWebClientTree.MyTreeListener' was not
serializable and has no concrete serializable subtypes



=====================================  Build messages
=================
Ant Home .\tool\ant
Java and XML Build System
-------------------
Starting Ant...
10:51 AM
Buildfile: buildAll.xml

buildThinClientNew:
    [mkdir] Created dir: E:\AllUsers\User1\myproduct_trunk\MyProduct
\war\zyzwebclient\WEB-INF\lib
    [mkdir] Created dir: E:\AllUsers\User1\myproduct_trunk\MyProduct
\war\zyzwebclient\WEB-INF\classes
     [copy] Copying 1 file to E:\AllUsers\User1\myproduct_trunk
\MyProduct\war\zyzwebclient\WEB-INF\lib
     [java] Compiling module com.mycompany.zyz.client.web.UFOWebClient
     [java]    Scanning for additional dependencies: file:/E:/AllUsers/
User1/myproduct_trunk/MyProduct/src/com/mycompany/web/client/
VXWWebClient.java
     [java]       Computing all possible rebind results for
'com.mycompany.web.client.UFOWebClientService'
     [java]          Rebinding
com.mycompany.web.client.UFOWebClientService
     [java]             Invoking <generate-with
class='com.google.gwt.user.rebind.rpc.ServiceInterfaceProxyGenerator'/
>
     [java]                Generating client proxy for remote service
interface 'com.mycompany.web.client.UFOWebClientService'
     [java]                   Analyzing
'com.mycompany.web.client.UFOWebClientService' for serializable types
     [java]                      Analyzing methods:
     [java]                         public abstract
java.util.ArrayList<com.mycompany.web.client.data.VXWObject>
getAlertComments(java.lang.String eventId) throws
com.mycompany.web.client.InvalidSessionException,
com.mycompany.web.client.VXWebException
     [java]                            Return type:
java.util.ArrayList<com.mycompany.web.client.data.VXWObject>
     [java]
java.util.ArrayList<com.mycompany.web.client.data.VXWObject>
     [java]                                  Verifying instantiability
     [java]
java.util.ArrayList<com.mycompany.web.client.data.VXWObject>
     [java]                                        Checking parameters
of 'java.util.ArrayList<com.mycompany.web.client.data.VXWObject>'
     [java]                                           Checking type
argument 0 of type 'java.util.ArrayList<E>' because it is directly
exposed in this type or in one of its subtypes
     [java]
com.mycompany.web.client.data.VXWObject
     [java]                                                 Verifying
instantiability
     [java]
com.mycompany.web.client.data.VXWObject
     [java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
     [java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWRole
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWGroup
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWNode
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWAlert
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWUser
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWServerHealth
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWProcess
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
com.mycompany.web.client.data.VXWObject parent
 
[java]
com.mycompany.web.client.data.VXWObject
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.data.VXWOrderedList
 
[java]
Analyzing the fields of type 'com.mycompany.web.client.data.VXWObject'
that qualify for serialization
 
[java]
protected
java.util.ArrayList<com.mycompany.web.client.data.VXWListener>
listeners
 
[java]
java.util.ArrayList<com.mycompany.web.client.data.VXWListener>
 
[java]
Verifying instantiability
 
[java]
java.util.ArrayList<com.mycompany.web.client.data.VXWListener>
 
[java]
Checking parameters of
'java.util.ArrayList<com.mycompany.web.client.data.VXWListener>'
 
[java]
Checking type argument 0 of type 'java.util.ArrayList<E>' because it
is directly exposed in this type or in one of its subtypes
 
[java]
com.mycompany.web.client.data.VXWListener
 
[java]
Verifying instantiability
 
[java]
com.mycompany.web.client.UFOWebClientFlexTable
 
[java]
Analyzing the fields of type
'com.mycompany.web.client.UFOWebClientFlexTable' that qualify for
serialization
 
[java]
java.util.ArrayList columns
 
[java]
java.util.ArrayList
 
[java]
Verifying instantiability
 
[java]
java.util.ArrayList<? extends java.lang.Object>
 
[java]
[WARN] Checking all subtypes of Object which qualify for serialization
 
[java]
com.mycompany.web.client.UFOWebClientTable
 
[java]
[ERROR] Type 'com.mycompany.web.client.UFOWebClientTable' was not
serializable and has no concrete serializable subtypes
 
[java]
com.mycompany.web.client.UFOWebClientTree
 
[java]
[ERROR] Type 'com.mycompany.web.client.UFOWebClientTree' was not
serializable and has no concrete serializable subtypes
 
[java]
com.mycompany.web.client.UFOWebClientNodeTreeItem
 
[java]
[ERROR] Type 'com.mycompany.web.client.UFOWebClientNodeTreeItem' was
not serializable and has no concrete serializable subtypes
 
[java]
com.mycompany.web.client.UFOWebClientTree.MyTreeListener
 
[java]
[ERROR] Type
'com.mycompany.web.client.UFOWebClientTree.MyTreeListener' was not
serializable and has no concrete serializable subtypes

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