Shared state


I try add this to my class MyComponentState:
public List vo = new ArrayList ();

And acces from MyComponent :
Line line = new Line(0,0,400,400);

I have a compile error :
property Has the ‘height’ without getter defined.
Errors in ‘com / Vaadin / customer / metadata /
Line 76: Failed to resolve’ com.vaadin.client.metadata.ConnectorBundleLoader 'via deferred binding

VectorObject comes package org.vaadin.gwtgraphics.client.VectorObject;

I look kind support here :
List, Map, Set

I do not understand what is happening.

Tanks for your help.