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[英]Java error: Could not find or load main class - Netbeans IDE
[英]Java Netbeans show error for opencv3 “ Error: Could not find or load main class library”
我試圖通過此鏈接在Netbeans中的Java中執行opencv項目
這是代碼:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package gui;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import javax.imageio.ImageIO;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
//import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
/**
*
* @author Tawfiq Chowdhury
*/
public class FaceDetection extends javax.swing.JFrame {
private DaemonThread myThread = null;
int count = 0;
VideoCapture webSource = null;
Mat frame = new Mat();
MatOfByte mem = new MatOfByte();
CascadeClassifier faceDetector = new CascadeClassifier("C:/Users/Tawfiq Chowdhury/Documents/NetBeansProjects/FaceDetection/src/gui /haarcascade_frontalface_alt.xml");
MatOfRect faceDetections = new MatOfRect();
/**
* Creates new form FaceDetection
*/
class DaemonThread implements Runnable {
protected volatile boolean runnable = false;
@Override
public void run() {
synchronized (this) {
while (runnable) {
if (webSource.grab()) {
try {
webSource.retrieve(frame);
Graphics g = jPanel1.getGraphics();
faceDetector.detectMultiScale(frame, faceDetections);
for (Rect rect : faceDetections.toArray()) {
// System.out.println("ttt");
Imgproc.rectangle(frame, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
new Scalar(0, 255,0));
}
Imgcodecs.imencode(".bmp", frame, mem);
Image im = ImageIO.read(new ByteArrayInputStream(mem.toArray()));
BufferedImage buff = (BufferedImage) im;
if (g.drawImage(buff, 0, 0, getWidth(), getHeight()-150 , 0, 0, buff.getWidth(), buff.getHeight(), null)) {
if (runnable == false) {
System.out.println("Paused ..... ");
this.wait();
}
}
} catch (Exception ex) {
System.out.println("Error!!");
ex.printStackTrace();
}
}
}
}
}
}
public FaceDetection() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Pause");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(153, 153, 153)
.addComponent(jButton1)
.addGap(156, 156, 156)
.addComponent(jButton2)
.addContainerGap(198, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(296, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addGap(86, 86, 86))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(50, 50, 50)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(115, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(59, 59, 59)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
webSource = new VideoCapture(0); // video capture from default cam
myThread = new DaemonThread(); //create object of threat class
Thread t = new Thread(myThread);
t.setDaemon(true);
myThread.runnable = true;
t.start(); //start thrad
jButton1.setEnabled(true); // deactivate start button
jButton2.setEnabled(false);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
myThread.runnable = false; // stop thread
jButton2.setEnabled(true); // activate start button
jButton1.setEnabled(false); // deactivate stop button
webSource.release(); // stop caturing fron cam
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(FaceDetection.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FaceDetection.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FaceDetection.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FaceDetection.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new FaceDetection().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
我還使用添加了庫
-DJava library path="C:\opencv\build\java\x86"
但是,當我按下運行按鈕時,它會顯示BUILD FAILED和
無法找到或加載主類庫。
我正在NetBeans 8中使用最新版本的opencv和最新版本的JDK。 該代碼在opencv3中存在一些問題,因此我根據鏈接中提供的建議進行了一些更改。
嘗試移動System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
加載本機庫時,主要方法之外的方法應該是第一個加載。 所以把你的加載語句放在一個靜態存根中
public class FaceDetection extends javax.swing.JFrame {
static{
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
}
....
....
....
// rest of your code goes here
....
....
....
}
解決方案在於“ VM選項”。 我已經添加了VM Option -Djava庫path =“ / usr / lib / jni /”來使librxtx-java正常工作(根據這篇文章)。 刪除此VM選項解決了我的問題。 我還沒有測試我是否仍然可以連接到我的串行設備(這就是我使用librxtx-java的原因),因為我的串口設備不在這里。
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