Sorry for the weird title, didn't knew what exactly to write. I am working on a JavaFX application with Java8. For this purpose, I have the javafx-maven-plugin from com.zenjava. I have a simple code for testing, where there is a Main class, and one css page for styling. I have the same project without maven, and it works fine. But with Maven I am unable to get it running. I get an NPE for the CSS file-. I have tried multiple options already. Any help would be nice. Thank you.
Error log :
Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at View.Main.start(Main.java:110)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
... 1 more
POM.xml :
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>MavenFX</groupId>
<artifactId>MavenFX</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>com.zenjava</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>8.2.0</version>
<configuration>
<mainClass>View.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
Main class :
package View;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.effect.DropShadow;
import javafx.scene.effect.Reflection;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class Main extends Application {
String user = "JavaFX2";
String pw = "password";
String checkUser, checkPw;
@Override
public void start(Stage primaryStage) throws Exception{
primaryStage.setTitle("Test Login");
BorderPane bp = new BorderPane();
bp.setPadding(new Insets(10,50,50,50));
//Adding HBox
HBox hb = new HBox();
hb.setPadding(new Insets(20,20,20,30));
//Adding GridPane
GridPane gridPane = new GridPane();
gridPane.setPadding(new Insets(20,20,20,20));
gridPane.setHgap(5);
gridPane.setVgap(5);
//Implementing Nodes for GridPane
Label lblUserName = new Label("Username");
final TextField txtUserName = new TextField();
Label lblPassword = new Label("Password");
final PasswordField pf = new PasswordField();
Button btnLogin = new Button("Login");
final Label lblMessage = new Label();
//Adding Nodes to GridPane layout
gridPane.add(lblUserName, 0, 0);
gridPane.add(txtUserName, 1, 0);
gridPane.add(lblPassword, 0, 1);
gridPane.add(pf, 1, 1);
gridPane.add(btnLogin, 2, 1);
gridPane.add(lblMessage, 1, 2);
//Reflection for gridPane
Reflection r = new Reflection();
r.setFraction(0.7f);
gridPane.setEffect(r);
//DropShadow effect
DropShadow dropShadow = new DropShadow();
dropShadow.setOffsetX(5);
dropShadow.setOffsetY(5);
//Adding text and DropShadow effect to it
Text text = new Text("Test Login");
text.setFont(Font.font("Courier New", FontWeight.BOLD, 28));
text.setEffect(dropShadow);
//Adding text to HBox
hb.getChildren().add(text);
//Add ID's to Nodes
bp.setId("bp");
gridPane.setId("root");
btnLogin.setId("btnLogin");
text.setId("text");
//Action for btnLogin
btnLogin.setOnAction(event -> {
checkUser = txtUserName.getText();
checkPw = pf.getText();
if(checkUser.equals(user) && checkPw.equals(pw)){
lblMessage.setText("Congratulations!");
lblMessage.setTextFill(Color.GREEN);
}
else{
lblMessage.setText("Incorrect user or pw.");
lblMessage.setTextFill(Color.RED);
}
txtUserName.setText("");
pf.setText("");
});
//Add HBox and GridPane layout to BorderPane Layout
bp.setTop(hb);
bp.setCenter(gridPane);
//Adding BorderPane to the scene and loading CSS
Scene scene = new Scene(bp);
scene.getStylesheets().add(getClass().getClassLoader().getResource("UI/login.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("Test Login");
/*primaryStage.titleProperty().bind(
scene.widthProperty().asString().
concat(" : ").
concat(scene.heightProperty().asString()));*/
primaryStage.setResizable(false);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
CSS file :
#root {
-fx-background-color: linear-gradient(lightgray, gray);
-fx-border-color: white;
-fx-border-radius: 20;
-fx-padding: 10 10 10 10;
-fx-background-radius: 20;
}
#bp {
-fx-background-color: linear-gradient(gray,DimGrey );
}
#btnLogin {
-fx-background-radius: 30, 30, 29, 28;
-fx-padding: 3px 10px 3px 10px;
-fx-background-color: linear-gradient(orange, orangered );
}
#text {
-fx-fill: linear-gradient(orange , orangered);
}
If I run mvn jfx:jar, I get the jar file, but it also has the same problem. Why is that if it's a Maven project, JavaFX has problem finding files. ANy help would be nice. Thank you.
