Develop Reference

Couldn't find or load main class in JavaFx sample [duplicate]

I'm trying to build a small user interface using JavaFX, But I'm getting an error like this:
Error: Could not find or load main class myApp Caused by:
java.lang.NoClassDefFoundError: javafx/application/Application
This is my code:
and im using jdk 12.0.2
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class myApp extends Application{
public static void main(String[] args) {
Phonebook mybook = new Phonebook();
launch(args);
}
#Override
public void start(Stage primaryStage) throws Exception {
Group group = new Group();
Scene scene = new Scene(group, 600, 300);
scene.setFill(Color.GRAY);
primaryStage.setTitle("Phone Book");
primaryStage.setScene(scene);
primaryStage.show();
}
This is the Libraries and jdk I'm using:
Image1

I think JavaFX is not a part of the JDK > 9 any more. (Your version is 12.x.x)
Probably this could help you:
https://openjfx.io/openjfx-docs/#install-javafx
(Assuming you are using Maven) If this does not help, try to clean and build your Application.
Sometimes Maven does not recognize newly added dependencies.

JavaFX Exception in thread "WindowsNativeRunloopThread" java.lang.NoSuchMethodError: <init>

I just wrote this code here:
package SpellcheckerClient;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
try {
BorderPane root = FXMLLoader.load(getClass().getResource("/controller/gui.fxml"));
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("Spellchecker Client");
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
And this is the corresponding controller.
package controller;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import spellchecker.remote.SpellcheckerRemoteAdapter;
public class Controller {
#FXML
TextField input;
#FXML
Button send;
#FXML
TextArea area;
#FXML
Button connect;
private SpellcheckerRemoteAdapter adapter;
#FXML
private void send() throws RemoteException{
String toCheck = input.getText();
this.area.appendText(toCheck + "\n");
this.area.appendText(checkRoutine(toCheck, this.adapter) + "\n\n");
this.input.clear();
}
public void initiateConnection() {
try {
Registry registry = LocateRegistry.getRegistry(1088);
this.adapter = (SpellcheckerRemoteAdapter) registry.lookup(SpellcheckerRemoteAdapter.NAME);
this.area.appendText("Verbindung erfolgreich aufgebaut!\n");
connect.setDisable(true);
} catch (Exception e) {
if(this.adapter == null) {
this.area.appendText("Server nicht gefunden!\n");
}
}
}
private static String checkRoutine(String input, SpellcheckerRemoteAdapter adapter) throws RemoteException {
if (input == null || input.isEmpty()) {
return "Bitte etwas eingeben!";
}
String[] words = input.split(" ");
boolean control = true;
String output = "";
for(String word : words) {
if(!adapter.check(word)) {
control = false;
output += word + ":\t" + adapter.getProposal(word) + "\n";
}
}
if(control) {
return "Alles Okay!\n";
}
return output;
}
}
If I run this code on my Laptop, where I wrote it, it runs perfectly fine in Eclipse and as runnable Jar. However, if I try to run the JAR on another computer i receive this error message:
Exception in thread "WindowsNativeRunloopThread" java.lang.NoSuchMethodError: <init>
at javafx.graphics/com.sun.glass.ui.win.WinApplication.staticScreen_getScreens(Native Method)
at javafx.graphics/com.sun.glass.ui.Screen.initScreens(Unknown Source)
at javafx.graphics/com.sun.glass.ui.Application.lambda$run$1(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Exception in thread "WindowsNativeRunloopThread" java.lang.NoSuchMethodError: <init>
at javafx.graphics/com.sun.glass.ui.win.WinApplication.staticScreen_getScreens(Native Method)
at javafx.graphics/com.sun.glass.ui.Screen.initScreens(Unknown Source)
at javafx.graphics/com.sun.glass.ui.Application.lambda$run$1(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.graphics/com.sun.prism.d3d.D3DPipeline.getAdapterOrdinal(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.assignScreensAdapters(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runToolkit(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.lambda$startup$10(Unknown Source)
at javafx.graphics/com.sun.glass.ui.Application.lambda$run$1(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
On my Laptop and my Computer are the same Versions of the JDK/JRE installed.
I don't really get what the error message is telling me.

Hello I have the same issue on my Eclipse environnement (Windows 10 OS),
adding in VM option -Djava.library.path="C:\WINDOWS\Sun\Java\bin" solved my problem
That means that javafx-graphics-[version]-win.jar call some native dll. And You have to found were those dll is stored.
I found the path, thanks to jvisualvm and showing the VM option for the case where it's the application run correctly.
Hoping that it will solve your problem.

Which JDk you have installed?? I have the same issue and i use JDK 8 instead of JDK 9. Which helped me.Sample Image of Exception
This is because jar which i created it was created on JDK 8 through a different system.
Where as when it was executing on another system which has JDK9. So it is version incompatible.
After keeping single JDK 8 and mapped it to system environment when i try to run my jar it worked for me.
Good Luck :)

Problems with LDAP authentication: java.lang.IncompatibleClassChangeError

I've got a class that allows me to authenticate with LDAP. When i run this code in a project with just one class (for testing reasons) i don't have problems and it returns a boolean value, as is expected, but when i run it in the project i'm working in, i got the following error:
java.lang.IncompatibleClassChangeError: Class org.apache.mina.filter.codec.ProtocolCodecFilter does not implement the requested interface org.apache.mina.core.filterchain.IoFilter
This is the method the allows me to authenticate:
public static void autenticarUsuario(String usuar, String password) throws LdapException, CursorException{
Dn user = Dn.EMPTY_DN;
try{
BasicConfigurator.configure();
LdapConnectionConfig config = new LdapConnectionConfig();
config.setLdapHost(SERVER_IP);
config.setLdapPort(PORT);
config.setName("uid=ldapsearch,ou=System,ou=Users,dc=fiec,dc=espol,dc=edu,dc=ec");
config.setCredentials(CREDENTIALS);
conn = new LdapNetworkConnection(config);
}catch(Exception e){
}
String s1 = usuar;
String s2 = password;
//System.out.println("Nombre: "+s1+" Contra: "+s2);
try {
conn.bind();
System.out.println(conn.isAuthenticated());
// Create the SearchRequest object
SearchRequest req = new SearchRequestImpl();
req.setScope( SearchScope.SUBTREE );
req.addAttributes( "*" );
req.setTimeLimit( 0 );
req.setBase( new Dn( "ou=Users,dc=fiec,dc=espol,dc=edu,dc=ec" ) );
req.setFilter( "(uid="+ s1 +")" );
// Process the request
SearchCursor searchCursor = conn.search( req );
while ( searchCursor.next() )
{
Response r = searchCursor.get();
if(r instanceof SearchResultEntry){
Entry re = ((SearchResultEntry) r).getEntry();
user = re.getDn();
}
}
conn.bind(user, s2);
//return(conn.isAuthenticated());
inLDAP = conn.isAuthenticated();
} catch (InvalidConnectionException ex) {
//System.out.println(ex);
}
catch (LdapException e) {
e.printStackTrace();
} catch (CursorException e) {
e.printStackTrace();
}
inLDAP = false;
}
The project i'm working in is a JAVAFX application, but this method is called in a class that doesn't extend from application (just java code to verify user credentials).
This is the stacktrace:
Exception in thread "pool-1-thread-1" java.lang.IncompatibleClassChangeError: Class org.apache.mina.filter.codec.ProtocolCodecFilter does not implement the requested interface org.apache.mina.core.filterchain.IoFilter
at org.apache.mina.core.filterchain.DefaultIoFilterChain.register(DefaultIoFilterChain.java:267)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.addLast(DefaultIoFilterChain.java:174)
at org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder.buildFilterChain(DefaultIoFilterChainBuilder.java:436)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.addNow(AbstractPollingIoProcessor.java:528)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.handleNewSessions(AbstractPollingIoProcessor.java:501)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:67)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1116)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
These are the libraries i'm working:
import org.apache.directory.api.ldap.model.cursor.CursorException;
import org.apache.directory.api.ldap.model.cursor.SearchCursor;
import org.apache.directory.api.ldap.model.entry.Entry;
import org.apache.directory.api.ldap.model.exception.LdapException;
import org.apache.directory.api.ldap.model.message.Response;
import org.apache.directory.api.ldap.model.message.SearchRequest;
import org.apache.directory.api.ldap.model.message.SearchRequestImpl;
import org.apache.directory.api.ldap.model.message.SearchResultEntry;
import org.apache.directory.api.ldap.model.message.SearchScope;
import org.apache.directory.api.ldap.model.name.Dn;
import org.apache.directory.ldap.client.api.LdapConnection;
import org.apache.directory.ldap.client.api.LdapConnectionConfig;
import org.apache.mina.*;
import org.apache.directory.ldap.client.api.LdapNetworkConnection;
import org.apache.directory.ldap.client.api.exception.InvalidConnectionException;
import org.apache.log4j.BasicConfigurator;
I don't know why this is happening, i'll appreciate any help in advance

It is a version problem. Between Mina 1.0 and Mina 2.0, they moved the IoFilter interface (among other things) from org.apache.mina.filterchain to org.apache.mina.core.filterchain. I think you are trying to use code compiled for Mina 2.0 with the Mina 1.0 implementation.
Solution: examine your build and runtime classpaths and dependencies to figure out how this happened ... and fix the inconsistency.

Open External Application From JavaFX

I found a way to open a link on default browser using HostServices.
getHostServices().showDocument("http://www.google.com");
Is there any way to open a media in default media player?
Is there any way to launch a specific File or Application?

Generally speaking, you can use Desktop#open(file) to open a file natively as next:
final Desktop desktop = Desktop.isDesktopSupported() ? Desktop.getDesktop() : null;
if (desktop != null && desktop.isSupported(Desktop.Action.OPEN)) {
desktop.open(file);
} else {
throw new UnsupportedOperationException("Open action not supported");
}
Launches the associated application to open the file. If the specified
file is a directory, the file manager of the current platform is
launched to open it.
More specifically, in case of a browser you can use directly Desktop#browse(uri), as next:
final Desktop desktop = Desktop.isDesktopSupported() ? Desktop.getDesktop() : null;
if (desktop != null && desktop.isSupported(Desktop.Action.BROWSE)) {
desktop.browse(uri);
} else {
throw new UnsupportedOperationException("Browse action not supported");
}
Launches the default browser to display a URI. If the default browser
is not able to handle the specified URI, the application registered
for handling URIs of the specified type is invoked. The application is
determined from the protocol and path of the URI, as defined by the
URI class. If the calling thread does not have the necessary
permissions, and this is invoked from within an applet,
AppletContext.showDocument() is used. Similarly, if the calling does
not have the necessary permissions, and this is invoked from within a
Java Web Started application, BasicService.showDocument() is used.

If you want to either open a URL which has an http: scheme in the browser, or open a file using the default application for that file type, the HostServices.showDocument(...) method you referenced provides a "pure JavaFX" way to do this. Note that you can't use this (as far as I can tell) to download a file from a web server and open it with the default application.
To open a file with the default application, you must convert the file to the string representation of the file: URL. Here is a simple example:
import java.io.File;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
public class OpenResourceNatively extends Application {
#Override
public void start(Stage primaryStage) {
TextField textField = new TextField("http://stackoverflow.com/questions/39898704");
Button openURLButton = new Button("Open URL");
EventHandler<ActionEvent> handler = e -> open(textField.getText());
textField.setOnAction(handler);
openURLButton.setOnAction(handler);
FileChooser fileChooser = new FileChooser();
Button openFileButton = new Button("Open File...");
openFileButton.setOnAction(e -> {
File file = fileChooser.showOpenDialog(primaryStage);
if (file != null) {
open(file.toURI().toString());
}
});
VBox root = new VBox(5,
new HBox(new Label("URL:"), textField, openURLButton),
new HBox(openFileButton)
);
root.setPadding(new Insets(20));
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
private void open(String resource) {
getHostServices().showDocument(resource);
}
public static void main(String[] args) {
launch(args);
}
}

Only the solution with java.awt.Desktop worked for me to open a file from JavaFX.
However, at first, my application got stuck and I had to figure out that it is necessary to call Desktop#open(File file) from a new thread. Calling the method from the current thread or the JavaFX application thread Platform#runLater(Runnable runnable) resulted in the application to hang indefinitely without an exception being thrown.
This is a small sample JavaFX application with the working file open solution:
import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
public class FileOpenDemo extends Application {
#Override
public void start(Stage primaryStage) {
final Button button = new Button("Open file");
button.setOnAction(event -> {
final FileChooser fileChooser = new FileChooser();
final File file = fileChooser.showOpenDialog(primaryStage.getOwner());
if (file == null)
return;
System.out.println("File selected: " + file.getName());
if (!Desktop.isDesktopSupported()) {
System.out.println("Desktop not supported");
return;
}
if (!Desktop.getDesktop().isSupported(Desktop.Action.OPEN)) {
System.out.println("File opening not supported");
return;
}
final Task<Void> task = new Task<Void>() {
#Override
public Void call() throws Exception {
try {
Desktop.getDesktop().open(file);
} catch (IOException e) {
System.err.println(e.toString());
}
return null;
}
};
final Thread thread = new Thread(task);
thread.setDaemon(true);
thread.start();
});
primaryStage.setScene(new Scene(button));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
The other proposed solution with javafx.application.HostServices did not work at all. I am using OpenJFX 8u141 on Ubuntu 17.10 amd64 and I got the following exception when invoking HostServices#showDocument(String uri):
java.lang.ClassNotFoundException: com.sun.deploy.uitoolkit.impl.fx.HostServicesFactory
Obviously, JavaFX HostServices is not yet properly implemented on all platforms. On this topic see also: https://github.com/Qabel/qabel-desktop/issues/420

Accessing java fx clipboard from a commandline application?

This might be a stupid question from a newbie, so bear with me. Here is what I did:
import javafx.scene.input.Clipboard;
import javafx.scene.input.ClipboardContent;
import javax.sound.sampled.Clip;
public class Main {
public static void main(String[] args) {
final Clipboard clipboard = Clipboard.getSystemClipboard();
final ClipboardContent content = new ClipboardContent();
content.putHtml("<b>Some bold html</b>");
clipboard.setContent(content);
}
}
I got the following error:
/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/bin/java -Didea.launcher.port=7532 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA 13 CE.app/bin" -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/tools.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/htmlconverter.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Users/kaiyin/IdeaProjects/untitled8/out/production/untitled8:/Applications/IntelliJ IDEA 13 CE.app/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain com.company.Main
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=lcd -Dsun.java2d.xrender=true
Exception in thread "main" java.lang.IllegalStateException: This operation is permitted on the event thread only; currentThread = main
at com.sun.glass.ui.Application.checkEventThread(Application.java:432)
at com.sun.glass.ui.ClipboardAssistance.<init>(ClipboardAssistance.java:40)
at com.sun.javafx.tk.quantum.QuantumToolkit.getSystemClipboard(QuantumToolkit.java:1127)
at javafx.scene.input.Clipboard.getSystemClipboardImpl(Clipboard.java:410)
at javafx.scene.input.Clipboard.getSystemClipboard(Clipboard.java:175)
at com.company.Main.main(Main.java:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Process finished with exit code 1
Is it possible to access javafx cliboard without creating a gui at all?

I'll ignore the question of why you would ever want to do this...
As pointed out in the comments, you need to start the FX Application Thread in order to access the JavaFX clipboard. However, you don't actually need to show a Stage at any point.
The following compiles and runs:
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.input.Clipboard;
import javafx.scene.input.ClipboardContent;
import javafx.stage.Stage;
public class ClipboardTest extends Application {
#Override
public void start(Stage primaryStage) {
final Clipboard clipboard = Clipboard.getSystemClipboard();
final ClipboardContent content = new ClipboardContent();
content.putHtml("<b>Some bold html</b>");
clipboard.setContent(content);
Platform.exit();
}
public static void main(String[] args) {
launch(args);
}
}