--- title: Migrating from Vaadin 6 order: 12 layout: page --- [[gwt.vaadin-6-migration]] = Migrating from Vaadin 6 ((("Vaadin 6 Migration", "add-ons", id="term.gwt.vaadin-6-migration", range="startofrange"))) The client-side architecture was redesigned almost entirely in Vaadin 7. In Vaadin 6, state synchronization was done explicitly by serializing and deserializing the state on the server- and client-side. In Vaadin 7, the serialization is handled automatically by the framework using state objects. In Vaadin 6, a server-side component serialized its state to the client-side using the [interfacename]#Paintable# interface in the client-side and deserialized the state through the [interfacename]#VariableOwner# interface. In Vaadin 7, these are done through the [interfacename]#ClientConnector# interface. On the client-side, a widget deserialized its state through the [interfacename]#Paintable# interface and sent state changes through the [interfacename]#ApplicationConnection# object. In Vaadin 7, these are replaced with the [interfacename]#ServerConnector#. In addition to state synchronization, Vaadin 7 has an RPC mechanism that can be used for communicating events. They are especially useful for events that are not associated with a state change, such as a button click. The framework ensures that the connector hierarchy and states are up-to-date when listeners are called. [[gwt.vaadin-6-migration.quick]] == Quick (and Dirty) Migration Vaadin 7 has a compatibility layer that allows quick conversion of a widget. . Create a connector class, such as [classname]#MyConnector#, that extends [classname]#LegacyConnector#. Implement the [methodname]#getWidget()# method. . Move the [literal]#++@ClientWidget(MyWidget.class)++# from the server-side component, say [classname]#MyComponent#, to the [classname]#MyConnector# class and make it [literal]#++@Connect(MyComponent.class)++#. . Have the server-side component implement the LegacyComponent interface to enable compatibility handling. . Remove any calls to [literal]#++super.paintContent()++# . Update any imports on the client-side (((range="endofrange", startref="term.gwt.vaadin-6-migration"))) > Nextcloud server, a safe home for all your data: https://github.com/nextcloud/serverwww-data
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