java.lang.NoClassDefFoundError for papplet

Question

我在设置处理时遇到问题。我有另一个项目，它可以很好地使用它，但是当我尝试创建一个新项目时，我不断遇到错误。我已经设置了所有库，并且正在使用处理 3.5.4，尽管我也尝试过最新版本。所有内容都添加到构建路径中，所以我不明白为什么找不到 PApplet

    Error: Could not find or load main class                 embodiedInteractionDance.MovingRectangle
    Caused by: java.lang.NoClassDefFoundError: processing/core/PApplet

运行配置并单击“显示命令行”

    C:\Users\user\.p2\pool\plugins\org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_17.0.9.v20231028-0858\jre\bin\javaw.exe
    -Dfile.encoding=UTF-8
    -Dstdout.encoding=UTF-8
    -Dstderr.encoding=UTF-8
    -p "C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\core.jar"
    -classpath "C:\Users\user\eclipse-workspace\embodiedInteractionDance\bin;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\gluegen-rt.jar;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\jogl-all.jar;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\MidPose.jar;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\gluegen-rt-natives-windows-amd64.jar;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\jogl-all-natives-windows-amd64.jar;C:\Users\user\eclipse-workspace\embodiedInteractionDance\libs\jogl-all-noawt-2.2.4.jar"
    -XX:+ShowCodeDetailsInExceptionMessages embodiedInteractionDance.MovingRectangle

我是否正确理解这是核心 jar 的问题？ 我已经清除了所有现有的运行配置并再次尝试，同样的错误

移动矩形

package embodiedInteractionDance;
import processing.core.*;

public class MovingRectangle extends PApplet{
// The argument passed to main must match the class name
public static void main(String[] args) {
    PApplet.main(MovingRectangle.class.getName());
}

// method used only for setting the size of the window
public void settings(){
    size(400,400);   
   
}

// identical use to setup in Processing IDE except for size()
public void setup(){
    background(0);
    stroke(255);
    strokeWeight(10);
}

// identical use to draw in Processing IDE
public void draw(){
    line(0, 0, 500, 500);
}}

使用处理

package shapes;
import processing.core.PApplet;
public class UsingProcessing extends PApplet {

//  Canvas canvas = new Canvas();
//  JFrame overlay = new JFrame("Mouse Listener");
public static void main(String[] args) {
    PApplet.main(UsingProcessing.class.getName());
    //      canvas.addMouseListener();
}
public void settings(){
    size(1000,1000);
}

public void setup(){
    strokeWeight(1);
    //moved the static objects from draw() to here
    //hair
    fill(0);
    ellipse(width/7*4, height/7, width-100, 350);
    rect(width/7, 200, width-100,height);

    //head
    fill(210,180,140);
    ellipse(height/2+50,width/2+50,height-100,width-100);
    //eyes
    fill(0); 
    ellipse(width/3,height/3,100,100);
    ellipse(width/3*2,height/3,100,100);

}

public void draw(){

    //pupils (leave them growing, fun effect)
    fill(120,50,240);
    stroke(0);
    ellipse(width/3,height/3,second(),second());
    ellipse(width/3*2,height/3,second(),second());
    
    //nose
    stroke(255, 102, 0);
    strokeWeight(5);
    noFill();
    curve(width/2, height/2-50, width/2, height/2+100, width/2+50, height/2+100, width/2+75, height/2+150);

    //eyebrows
    fill(175,50,75);
    triangle(width/4, height/4, width/4, height/4+50,  width/4+150, height/4+50 );
    triangle(width/4*3-150, height/4, width/4*3-150, height/4+50,  width/4*3+100, height/4+50 );

    //mouth
    fill(255,50,100);
    stroke(200,50,50);
    arc(width/2, height/3*2, width/3*2-width/3, second(), 0, PI, CHORD);

}}

Answer 1

根据命令行，您的

core.jar

位于模块路径（

-p

）上，而不是位于类路径（

-classpath

）上。这可能是一个问题，因为模块路径上的 JAR 被视为单独的封装模块。相比之下，所有其他 JAR 都位于类路径上，因此被视为单个未封装的模块，即所谓的“未命名模块”。 在

项目 > 属性：Java 构建路径选项卡 库，通过拖放将 core.jar 从

Modulepath

移动到 Classpath。