Error resolving event handler name from FXML

Question

I created a JavaFX Project using Maven. When i try to start the Project without an fxml file using: mvn javafx:run it starts perfectly. But as soon as i want to load an fxml file instead i get the following error:

      
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.805 s
[INFO] Finished at: 2022-12-03T15:46:04+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.openjfx:javafx-maven-plugin:0.0.8:run (default-cli) on project Chain3: Error: Command execution failed. Process exited with an error: 1 (Exit value: 1) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Exception in Application start method
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:119)
        at java.base/java.lang.reflect.Method.invoke(Method.java:578)
        at javafx.graphics@19/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:465)
        at javafx.graphics@19/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:364)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
        at java.base/java.lang.reflect.Method.invoke(Method.java:578)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1081)
Caused by: java.lang.RuntimeException: Exception in Application start method
        at javafx.graphics@19/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:901)
        at javafx.graphics@19/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
        at java.base/java.lang.Thread.run(Thread.java:1589)

Caused by: javafx.fxml.LoadException: Error resolving 
    onAction='#button1Pressed', either the event handler is
    not in the Namespace or there is an error in the script.

/C:/Users/49160/Documents/BlockchainGitHub/java_lesson_hannes-master/target/classes/main/Scene.fxml:9
        at javafx.fxml@19/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2703)
        at javafx.fxml@19/javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:621)
        at javafx.fxml@19/javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:781)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2924)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2639)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3331)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3287)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3255)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3227)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3203)
        at javafx.fxml@19/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3196)
        at main.FX.start(FX.java:39)
        at javafx.graphics@19/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:847)        at javafx.graphics@19/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
        at javafx.graphics@19/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at javafx.graphics@19/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
        at javafx.graphics@19/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at javafx.graphics@19/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at javafx.graphics@19/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
        ... 1 more
Exception running application main.FX
[ERROR] Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
    at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404)
    at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166)
    at org.openjfx.JavaFXBaseMojo.executeCommandLine (JavaFXBaseMojo.java:567)
    at org.openjfx.JavaFXBaseMojo.executeCommandLine (JavaFXBaseMojo.java:434)
    at org.openjfx.JavaFXRunMojo.execute (JavaFXRunMojo.java:105)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:370)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:171)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:163)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
    at java.lang.reflect.Method.invoke (Method.java:578)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
        at org.openjfx.JavaFXBaseMojo.executeCommandLine(JavaFXBaseMojo.java:567)
        at org.openjfx.JavaFXBaseMojo.executeCommandLine(JavaFXBaseMojo.java:434)
        at org.openjfx.JavaFXRunMojo.execute(JavaFXRunMojo.java:105)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
        at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:370)
        at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:351)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:215)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:171)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:163)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:294)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:960)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:293)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:196)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
        at java.base/java.lang.reflect.Method.invoke(Method.java:578)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)

That is the main.class i want to start: `

package main;
import java.io.File;
import java.io.IOException;

import org.apache.catalina.Context;
import org.apache.catalina.startup.Tomcat;
import org.glassfish.jersey.servlet.ServletContainer;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import org.glassfish.jersey.servlet.ServletContainer;

public class FX extends Application {
    public static void main(String[] args) {
        launch(args);
        
    }

    @Override
    public void start(Stage primaryStage) throws IOException {
        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
            }
        });

        Parent root = FXMLLoader.load(getClass().getResource("/main/Scene.fxml"));
        Scene scene = new Scene(root);
        scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

And last but not least my pom.xml:

`

<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>Chain3</groupId>
    <artifactId>Chain3</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.8</version>
                <configuration>
                    <mainClass>main.FX</mainClass>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <release>11</release>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcpkix-jdk15on</artifactId>
            <version>1.56</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.owlike</groupId>
            <artifactId>genson</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
            <version>2.27</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.27</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>8.5.11</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper</artifactId>
            <version>8.0.43</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.jgroups</groupId>
            <artifactId>jgroups</artifactId>
            <version>4.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-csv</artifactId>
            <version>1.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.openjfx/javafx -->
        <dependency>
        <groupId>org.openjfx</groupId>
        <artifactId>javafx-controls</artifactId>
        <version>19</version>
        </dependency>
        <dependency>
        <groupId>org.openjfx</groupId>
        <artifactId>javafx-fxml</artifactId>
        <version>19</version>
        </dependency>
    </dependencies>
</project>

`

I read through similar questions here and tried for example to specify the controller class correctly. I also checked the path and package declarations wihtout success.

the stacktrace tells you exactly what's wrong ;) Anyway, make sure to have studied a tutorial on javafx/fxml, when stuck come back with a [mcve] (mind the __M__! that is nothing unrelated, no external references, no fluff - yet still runnable as-is) demonstrating what's wrong (here that would have to be application, controller, fxml and complete stacktrace - so missing is controller and fxml) — kleopatra, Dec 03 '22 at 15:32
this is in your Stacktrace, which explains your exception quite well as @kleopatra already said: `javafx.fxml.LoadException: Error resolving onAction='#button1Pressed', either the event handler is not in the Namespace or there is an error in the script. /C:/Users/49160/Documents/BlockchainGitHub/java_lesson_hannes-master/target/classes/main/Scene.fxml:9` — krankkk, Dec 03 '22 at 15:55
Go to Scene.fxml, count down 9 lines, delete the text `onAction='#button1Pressed'`, or create the matching method in your controller. — jewelsea, Dec 03 '22 at 17:11

Error resolving event handler name from FXML

0 Answers0