JavaFX 2.0 :: Multithreading In Background In Application
Dec 25, 2014
I need to work with multiple threads in background in a JavaFX application. I have a screen with ten buttons and I need to 'bind' each thread with the button that started the thread. If the user pressed a button that had started a thread (in the main screen, MainController.java), I need to recover it to display the information that contains to display it on the controls of Details Screen ( a second screen, DetailController.java).
What Class do you recommend for this? Service?
[URL] ....
It is possible to name the threads with any of these classes?
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Jun 21, 2015
when i set a certain menuitem background color, the highlight is losed. What should i do?
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Sep 27, 2014
I have a TextArea and want to set a linear-gradient as background, which works fine:
.text-area {
-fx-background-color: linear-gradient(to bottom, red 0%, blue 100%);
}
The problem is that if the TextArea contains much text (and long scrollbars) it is nearly only red. Only if you scroll down to the bottom, it becomes blue.
I want the red-blue gradient always look the same, no matter how much text there is.
In HTML there's something like background-attachment: fixed, which would do the trick, but not so in JavaFX.
Can I achieve it nonetheless. Preferably without any ugly workarounds, like a transparent TextArea within another Pane where the wrapping Pane has the gradient.
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Dec 1, 2014
If I "embed" a ProgressIndicator inside a ListView it has an ugly border and a white background. It looks like there's a TextField below the ProgressIndicator.
Why does it behave like that and how to solve it so that the progress indicator is transparent.
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.ProgressIndicator;
[Code] .....
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Jun 10, 2014
No problem setting background color for layouts, e.g. bdrPn.setBackground(new Background((new BackgroundFill(Color.BLACK, CornerRadii.EMPTY, Insets.EMPTY))));
But neither of the following are working for me, running JavaFX 8 on latest OS-X
scene = new Scene(bdrPn, winW, winH, Color.BLACK);
scene.setFill(Color.BLACK);
scene.setFill() worked fine for previous versions of JavaFX.
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Aug 26, 2014
I have a UI that uses fx:include to include a handful of nodes in a StackPane. So far I have less than 10 panes and I can already notice a delay of ~3 seconds (on an older machine) when the initial scene is built. It's especially noticeable because I'm using a pre-loader with a progress bar. The progress bar runs smoothly until the pre-loader calls start() on my application. After that, the scene is built on the application thread, so the progress bar doesn't get any more updates. It looks like the progress bar freezes until the main scene is built and shown.
I was hoping I could build the main scene on the JavaFX launcher thread, but that doesn't work. I tried it and, not surprisingly, get an exception for not being on the application thread. What are the options, if any, for making an application's start up feel a bit smoother?
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Sep 25, 2014
I do Java for decades, but am a FXML beginner. Currently I do FXMLLoader.load(fxmlFile) in Application.start(), which is working well. My Application instance is creating a background thread in Application.init() which feeds several custom application properties with incoming data taken from a remote model (wrapping a sensor hardware). Some of my windows shall later be able to access those properties. So the question is: How can I inject my Application instance into the FXMLLoader-created controller instances auto-bound to the FXML-created Scene instances?
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Jun 5, 2014
I'm new in JavaFX world. I'm going to write an application using FXML and this application will use embedded database. Is there any tutorial or example showing how to connect FXML (using controller as I expect) with database. I'm using Hibernate with classic JAva - is it possible to work with Hibernate with JavaFX?
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Aug 4, 2014
What would be the most effective method to display data grabbed from a web source that is queried every second, for example the most recent EUR/USD price?
I already have access to the data stream, and I've built a simple FXML in javaFX that contains a grid; I'm not sure how to approach putting the live ticking data into the grid so it continues to update as the price changes, for example.
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Jul 11, 2014
I built my application under Windows XP (x32), Eclipse Luna (x32), JDK 1.8 (x32 - beta version B116).
When i launch it, the splashscreen (preloader) appears !
I rebuilt my application under Windows 7 (x64), Eclipse Luna x64, JDK 1.8.0_20 (x64).
When i launch it, the splashscreen doesn't appear !!!
For information, The structure of my application :
app
| libs
| preloader.jar
myapplication.jar
runtime
The behavior of JDK 1.8.0_20 about the management of the preloading mecanism is it different of the behavior of JDK 1.8 (B116) ?
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Oct 6, 2014
Is it possible to save dynamically created UI elements (e.g. tabs, buttons) and restoring them in a later session for the user? The user should be able to customize the application UI and creating buttons as shortcuts for tools.
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Sep 25, 2014
I have the following problem:
Let's say, there is a simple Java application. It could either be a Swing or JavaFX or a plain Console application.
Then there are kind of X plugin jars which can be also on the classpath.
The main application (e.g. main.jar) scans the classpath for classes, which implement an plugin interface. For each found implementation it invokes some method on the interface.
The interesting part now is, that upon calling the interface method, some plugins may want to popup a JavaFX window.
And the problem is, that I can't just call Platform.runLater there, because of "java.lang.IllegalStateException: Toolkit not initialized".
And if I somehow manage to call Application.launch() (when? where?) in the plugin then there's the danger, that the second plugin gets "IllegalStateException: Application launch must not be called more than once"
I also don't want to call launch() in the main application, since it is not necessarily an JavaFX application.
Do I maybe need to start separate JVM in the plugin? Could it still communicate with the original JVM then (main.jar)?
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Jul 12, 2014
Any documentation that deals with assigining an icon to your application? I have tried the:
"stage.getIcons().add(new Image(this.getClass().getResourceAsStream("myicon.png")));"
Code as suggested on the web. It looks like this changes the icon in the window decoration only, which doesn't actually show on my Ubuntu desktop with Unity. What I really want is a custom icon for when I alt-tab through open applications. Currently it shows the default grey question mark. How do I assign an icon to the application.
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Nov 22, 2014
I was doing a project in a usual Java Application, but now maybe I have to use some tools that are contained in javafx.scene.media.MediaPlayer so I wonder if can it all work? Will javafx methods and such works?
I have to use javafx.scene.media.MediaPlayer beacuse I have to create a very simple audio player (one jbutton and one jcombobox).
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Feb 13, 2014
I am doing a multi threading program . I am unable to get the output i want. I have no compilation error . But I cant get the result I , Null exception. This is my Test program
import java.util.*;
public class Test
{
public static void main (String[]args){
int totalShares = 0 ;
double totalCost = 0.0;
String name = "FCS";
double profit = 0.0;
[code]....
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Aug 24, 2014
This is my own coding for understanding deadlock in multithreading . But my doubt is whether this program mirrors the concept of deadlock perfectly or not. If not what should i do to make this code a perfect deadlock.
import java.io.*;
class A
{
B bc;
synchronized void funcA(B b)
{
bc=b;
System.out.println("INSIDE FIRST OBJECTS MONITOR");
[Code] ....
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Sep 8, 2014
I'm creating UI's that run on top of backend tools that can run from seconds to days and output GB's of generated data (imagine running tar on the Google servers).
I understand how to execute my backed tools using a runtime process and how to interact with them, and running a simple text as a command line Java app works as expected. The issue occurs when I wrap the code in a JavaFX frount end UI try to update the UI elements in a reasonable manner. If I simply use System.out.println() as in the command line version, I see the output from my task. However, simply trying to put that same output into a TextArea using .appendText() doesn't update the TextArea until the background process completes.
I see all sorts of clippings relating to Task, CreateProcess, invokeLater, updateProgress, but none of them seem to solve their original posters' question (nor mine at this point).
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Mar 16, 2015
Difference between multithreading with and without executor framework.
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Feb 2, 2015
I am writing a simple program to simulate a traffic light. What I want is to make them glow after each 1 second, one by one. For example: Firstly Red, then after 10 seconds, red will be put to off and yellow will start glowing and then accordingly green. This process shall continue incessantly (Just for experimental purpose). I have some arrangement done but could not figure out how to put them together in run() method of Runnable interface. I know how interthread communication works. But could not find any logic in this case when three threads will run together.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TrafficLight extends JFrame implements Runnable
{
JButton red, green, yellow ;
TrafficLight()
[Code] .....
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Feb 8, 2014
Program to generate Fibonacci series program using java multithreading.
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Apr 21, 2014
I got a question in my last interview, its all about multithreading, interviewer asked me to write a program, to write the contents of three files(F1,F2,F3) in to a new File F4, using multithreading , first thread should read the first file and second thread should read second file, so the File F4 should contain F1's contents in first then F2's contents after that etc. I tried to give my best shot, but i couldn't get a way to ensure that the first thread is reading the first file and write to F4 then second thread reading the second file and writing once first file is written completely into F4 and so on ..how to do this?
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Aug 20, 2014
What is the best choice to program like an applet i mean easy with creating multithreading or drawing objects etc.
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Nov 17, 2014
convert or move standalone java thread application into Tomcat server container for accessing its JNDI services? Also is it possible to schedule this thread application in Tomcat server? is it possible to keep this app in tomcat as web application and schedule in window's scheduler.
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Mar 11, 2014
I am new to work on JNLP program. I have created a SWING program, JNLP file when i deploy the ear file i am getting 404 error. Please find the steps in details.
1.Created a dynamic web project JWStartProject in eclipse
2.Create a HelloWorld.java class under default package.
import javax.swing.*;
public class HelloWorld extends JFrame {
private static final long serialVersionUID = 4968624166243565348L;
private JLabel label = new JLabel("Hello Java Web START!");
public HelloWorld() {
super("Jave Web Start Example");
this.setSize(350, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
this.setLayout(null);
[Code] ....
Now I exported this project as JWStartProject.war contains following code.
Created Server in Websphere Admin console
Deployed this war file under the server and started.
I have added MIME types also.
I am unable to launch the application. I am getting 404 errors. May I know where I went wrong?
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Apr 18, 2014
I need to draw a sprite before the map but it never works.
My Code ( without the background sprite ) :
Java Code:
package com.TEST.Dermat.screens;
import com.TEST.Dermat.entities.Player;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
[Code] .....
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Jan 22, 2015
I am developing in Android Studio and I made a simple background, the actual resolution of the image is 1440 by 2560. I made it that resolution so, 1, it is easier to scale down than up, and 2, in android studio i use a nexus 6 as my preview. When I plugged in my gs4, not a 1440 by 2560 display, the background wouldn't show up when I ran it on my gs4(galaxy s 4). How do i get my background to scale and display on any display size.
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