Why am I getting java.lang.IllegalStateException “Not on FX application thread” on JavaFX?

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The user interface cannot be directly updated from a non-application thread. Instead, use Platform.runLater(), with the logic inside the Runnable object. For example:

Platform.runLater(new Runnable() {
    @Override
    public void run() {
        // Update UI here.
    }
});

As a lambda expression:

// Avoid throwing IllegalStateException by running from a non-JavaFX thread.
Platform.runLater(
  () -> {
    // Update UI here.
  }
);

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