What is the correct way to automatically restart a failed Service?

When / how I should restart a failed javafx.concurrent.Service?  I have an exception handler that is Worker.State of the Service and restarts the Service if an exception is handled successfully.  Observers who are saved before the error handler see a lifecycle for the worker while observers registered after the error handler see a different life cycle.  Here is an example of what I mean:

import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Service;
import javafx.concurrent.Task;
import javafx.concurrent.Worker;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;


public class RetryingServiceExample extends Application {
    private int retryCount = 1;


    @Override
    public void start(final Stage primaryStage) throws Exception {
        String osName = System.getProperty("os.name");
        String javaVersion = System.getProperty("java.version");
        String vmInfo = System.getProperty("java.vm.version") +
                " (" + System.getProperty("os.arch") + ")";


        System.out.println("OS: " + osName);
        System.out.println("Version: " + javaVersion);
        System.out.println("VM Info: " + vmInfo);
        System.out.println("----------------------------------------");


        Service<Void> service = new Service<Void>() {
            @Override
            protected Task<Void> createTask() {
                return new Task<Void>() {
                    @Override
                    protected Void call() throws Exception {
                        if(retryCount > 0) {
                            retryCount--;
                            throw new Exception("Fake exception");
                        }
                        return null;
                    }
                };
            }
        };


        final StringBuilder sb1 = new StringBuilder("#1...\r\n");
        service.stateProperty().addListener((o, old, newState) -> {
            sb1.append(old).append(" --> ").append(newState).append("\r\n");
        });


        service.stateProperty().addListener((o, old, newState) -> {
            if(newState == Worker.State.FAILED) {
                service.restart();
            }
        });


        final StringBuilder sb2 = new StringBuilder("#2...\r\n");
        service.stateProperty().addListener((o, old, newState) -> {
            sb2.append(old).append(" --> ").append(newState).append("\r\n");
        });


        service.start();


        Button close = new Button("Close");
        close.setOnAction(event -> {
            System.out.print(sb1.toString());
            System.out.println();
            System.out.print(sb2.toString());
            Platform.exit();
        });
        primaryStage.setScene(new Scene(close));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch();
    }
}

There will be no output until you click Close.  Here is the result:

OS: Windows 8.1
Version: 1.8.0_05
VM Info: 25.5-b02 (amd64)
----------------------------------------
#1...
READY --> SCHEDULED
SCHEDULED --> RUNNING
RUNNING --> FAILED
FAILED --> CANCELLED
CANCELLED --> READY
READY --> SCHEDULED
SCHEDULED --> RUNNING
RUNNING --> SUCCEEDED

#2...
READY --> SCHEDULED
SCHEDULED --> RUNNING
FAILED --> CANCELLED
CANCELLED --> READY
READY --> SCHEDULED
RUNNING --> SCHEDULED
SCHEDULED --> RUNNING
RUNNING --> SUCCEEDED

I find life a lot easier to reason about junior.  It is the cycle of life I expected to get by restarting Service method practice failed() because, according to the JavaDoc, it has the same effect that is assured to be the last wise listener.  See my related bug report:

https://JavaFX-JIRA.Kenai.com/browse/RT-36771

I find the second cycle of life more difficult to follow, but it's the only behavior I can get without using Platform #runLater (.) to restart the Service.  I can't quite yet reason on how the transition from EXECUTION to FAILURE becomes hidden.

Using Platform #runLater (...) when you restart the Service in the most reliable way to get the behavior I prefer?  Is it possible to use Platform #runLater (...) to get to the back of the queue like that?  Is it OK to restart a Service from a listener of the Worker.State or is it something that should be avoided?

Martin has responded to this in the bug report:

Let's not the example of the forum. You're basically a (State) property is changed on the inside it's listener property, i.e. the listeners will get notified when it has been changed to a completely different State. This should be avoided and the best way to do so is Platform.runLater ().

Tags: Java

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    exec: recNumber: = 1;
    UPDATE TABLE_TO_BE_UPD
    SET COL_TO_BE_UPD = COL_TO_BE_UPD + recNumber
    WHERE COL_TO_BE_UPD IN ('VAL_A', 'VAL_B');
    ----------

    I get invalid SQL statement error when you try to run above (except for the guest who asks for a value I want to omit).

    In any case, I also tried this one:
    ----------
    CREATE SEQUENCE seqCounter;
    UPDATE TABLE_TO_BE_UPD
    SET COL_TO_BE_UPD = COL_TO_BE_UPD + seqCounter.NEXTVAL
    WHERE COL_TO_BE_UPD IN ('VAL_A', 'VAL_B');
    ----------

    Of it, I got the error ORA-01722: invalid number... I guess it's because seqCounter is of type number and the COL_TO_BE_UPD is of type character... (?)

    Then I want to ask is what is the correct way to define and use a counter variable type to add a number at the end of a string?

    Also another question I would ask is that are variables that are used in queries ad hoc, also called "bind variables"?

    Thank you muchly

    If you want to add a unique number to a column, then it would be:

    UPDATE TABLE_TO_BE_UPD
SET COL_TO_BE_UPD = COL_TO_BE_UPD ||to_char(rownum)
WHERE COL_TO_BE_UPD IN ('VAL_A','VAL_B');

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