[appengine-java] ThreadLocal seems not to be working sometimes

[stole]

I have the following UserData class
public class UserData implements Serializable {
    private String name;
    private long timestamp;
    ...
}
Then in another class (which implements 
com.google.gwt.user.server.rpc.RemoteServiceServlet) I have a localUser member 
variable declared like so:
private transient ThreadLocal<UserData> localUser;
Finally, in the same class I have the following method:
private void setUser(final UserData userData) {
    if(userData == null)
        throw new NullPointerException("userData is null");

    if (localUser == null) {
        localUser = new ThreadLocal<UserData>();
    }
    localUser.set(userData);

    // The following is for test/debug purposes only.
    if(!userData.equals(localUser.get())){
        if(localUser.get() == null){
            l.severe("Mean bug: localUser.get() == null");
        } else {
            l.severe("Mean bug: localUser and userData are not equal");
        }
    }
}
Sometimes the code logs the 
  l.severe("Mean bug: localUser.get() == null");
message as I believe that a localUser.get() should always return a valid 
reference to userData since it has been set to it in the previous statement.

Has anyone had the same problem? I use the 1.5.4 appengine SDK. I reported the 
issue here:http://code.google.com/p/googleappengine/issues/detail?id=6010

Thanks for Your time.

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