Serialize JavaFX components

You are correct, JavaFX (as of 2.1) does not support serialization of components using the Java Serializable interface - so you cannot use that mechanism.

JavaFX can deserialize from an FXML document using the FXMLLoader.load() method.

The trick though, is how to write your existing components and states out to FXML?

Currently, there is nothing public from the platform which performs FXML serialization. Apparently, creating a generic scenegraph => FXML serializer is quite a complex task (and there is no public 3rd party API for this that I know of). It wouldn't be too difficult to iterate over the scenegraph and write out FXML for a limited set of components and attributes.

If the main goal of saving user components on the servers side - is to have a possibility to show the same interface to the user - why not to save all descriptive information you need about users components, and when it is needed - just rebuild user interface again, using stored descriptive information? Here is primitive example:

/* That is the class for storing information, which you need from your components*/
 public class DropedComponentsCoordinates implements Serializable{
private String componentID;
private String x_coord;
private String y_coord;
//and so on, whatever you need to get from yor serializable objects;
//getters and setters are assumed but not typed here.
 }

 /* I assume a variant with using FXML. If you don't - the main idea does not change*/
 public class YourController implements Initializable {

List<DropedComponentsCoordinates> dropedComponentsCoordinates;

@Override
public void initialize(URL url, ResourceBundle rb) {
    dropedComponentsCoordinates = new ArrayList();
}

//This function will be fired, every time 
//a user has dropped a component on the place he/she wants
public void OnDropFired(ActionEvent event) {
    try {
        //getting the info we need from components
        String componentID = getComponentID(event);
        String component_xCoord = getComponent_xCoord(event);
        String component_yCoord = getComponent_yCoord(event);

        //putting this info to the list
        DropedComponentsCoordinates dcc = new DropedComponentsCoordinates();
        dcc.setX_Coord(component_xCoord);
        dcc.setY_Coord(component_yCoord);
        dcc.setComponentID(componentID);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

private String getComponentID(ActionEvent event){
    String componentID;
    /*getting cpmponentID*/
    return componentID;
}
private String getComponent_xCoord(ActionEvent event){
    String component_xCoord;
    /*getting component_xCoord*/
    return component_xCoord;
}
private String getComponent_yCoord(ActionEvent event){
    String component_yCoord;
    /*getting component_yCoord*/
    return component_yCoord;
}
}