运行JavaFX Gradle应用程序时NoClassDefFoundError StringUtils或Gson

Question

我正在构建一个JavaFX应用程序，但我似乎无法添加和使用像Gson或Apache Commons Lang这样的库。在build.gradle中引用库时，库似乎添加正常，Intellij也在我的项目中显示它们.Gradle似乎也运行clean和build没有任何问题。当我实际运行应用程序并单击触发问题开始的事件子例程的按钮时，会出现问题。我也会遇到这样的错误，无论我试图引用哪个库：

Caused by: java.lang.NoClassDefFoundError: com/google/gson/Gson

这是我的代码

的build.gradle

apply plugin: 'java'
apply plugin: 'javafx-gradle-plugin'
//apply plugin: 'excelsiorJet'

group 'eagleview'
version '1.0-SNAPSHOT'

if (JavaVersion.current() != JavaVersion.VERSION_1_8) {
    throw new GradleException("Must Build with Java 1.8")
}

repositories {
    mavenLocal()
    mavenCentral()
}

dependencies {
    // https://mvnrepository.com/artifact/com.google.code.gson/gson
    compile group: 'com.google.code.gson', name: 'gson', version: '2.8.4'

    // https://mvnrepository.com/artifact/commons-lang/commons-lang
    compile group: 'commons-lang', name: 'commons-lang', version: '2.6'

}

sourceCompatibility = 1.8
targetCompatibility = 1.8

buildscript {
    //ext.jetPluginVersion = '1.1.0'

    dependencies {
        classpath group: 'de.dynamicfiles.projects.gradle.plugins', name: 'javafx-gradle-plugin', version: '8.8.2'
        //classpath "com.excelsiorjet:excelsior-jet-gradle-plugin:$jetPluginVersion"
    }
    repositories {
        mavenLocal()
        mavenCentral()

    }
}

jar {
    manifest {
        attributes(
                'Main-Class': 'eagleview.App',
                'Class-Path': configurations.compile.collect { it.getName() }.join(' '),

        )
    }
}

jfx {
    // Minimal requirement for jfxJar-task
    mainClass = 'eagleview.App'

    // Minimal requirement for jfxNative-task
    vendor = 'eagleview'
}

//excelsiorJet {
//    mainClass = 'eagleview.App'
//    hideConsole = true
//}

ConfigurationController.java

import com.google.gson.Gson;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.TextInputDialog;
import javafx.stage.Stage;
import org.apache.commons.lang.StringUtils;

import java.util.ArrayList;
import java.util.List;

public class ConfigurationController {
    private static Stage stage;

    public void render(Stage primary) throws Exception {
        stage = primary;
        Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("views/vwConfiguration.fxml"));

        stage.setTitle ("Config - Eagle View");
        stage.setScene(new Scene(root, 800, 600));
        stage.show();
    }

    @FXML
    private void handleButtonAddVideoClicked(ActionEvent event) throws Exception {
        Gson gson = new Gson();
        System.out.println(gson.toJson(new SettingsModel()));

        TextInputDialog dialog = new TextInputDialog();
        dialog.setTitle("What video would you like to add?");
        dialog.setContentText("Please provide a YouTube URL to add to your video list.");
        dialog.initOwner(stage);

        dialog.showAndWait().ifPresent(x -> {
            if(StringUtils.isNotBlank(x)) {
                System.out.println(x);
                importVideoQueue.add(x);
            }
        });

        event.consume();
    }
}

运行handleButtonAddVideoClicked时产生以下错误：

mymachine$ java -jar build/libs/eagleview-1.0-SNAPSHOT.jar /c
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1787)
    at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8865)
    at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
    at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
    at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3876)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1300(Scene.java:3604)
    at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1874)
    at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2613)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
    at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
    at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
    at javafx.graphics/com.sun.glass.ui.mac.MacView.notifyMouse(MacView.java:127)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
    at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
    ... 45 more
Caused by: java.lang.NoClassDefFoundError: com/google/gson/Gson
    at eagleview.controllers.ConfigurationController.handleButtonAddVideoClicked(ConfigurationController.java:50)
    ... 56 more
Caused by: java.lang.ClassNotFoundException: com.google.gson.Gson
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
    ... 57 more

如果我删除了Gson代码，那么我将得到一个关于StringUtils的错误，它看起来与上面完全相同，只是引用了特定的库包路径。

发生了什么？我的Gradle脚本配置不正确吗？

谢谢！

Answer 1

你错过了apache commons-lang在你的课程中。添加

// https://mvnrepository.com/artifact/commons-lang/commons-lang
compile group: 'commons-lang', name: 'commons-lang', version: '1.0.1'

到你的gradle文件。

2.6版具有包名

org.apache.commons.lang2

Answer 2

我找到了问题的解决方案。我试图建立一个JAR，但我目前的jar块并没有削减它。我需要建立一个＆＃34;脂肪＆＃34;动态拉入库的jar。移除了jar块并添加了下面的fatJar块。

task fatJar(type: Jar) {
    manifest {
        attributes 'Main-Class': 'eagleview.App'

    }

    from {
        configurations.compile.collect {
            it.isDirectory() ? it : zipTree(it)
        }
    } with jar
}

我使用./gradlw clean fatJar构建，应用程序运行完美，没有任何错误！