java - RMI ClassCastException 到远程接口(interface)-6ren

java - RMI ClassCastException 到远程接口(interface)

转载作者：行者123 更新时间：2023-12-02 03:33:23

您好，我遇到了 RMI 问题。

运行时出现此错误。

java.lang.ClassCastException: com.sun.proxy.$Proxy0 cannot be cast to rmi.converter

这是界面

转换器.java

import java.rmi.RemoteException;
public interface converter { 

double CelciusKelvin (double a) throws RemoteException;
double CelciusFahrenheit (double a) throws RemoteException;
double FahrenheitKelvin (double a) throws RemoteException;
double FahrenheitCelcius (double a) throws RemoteException;
double KelvinCelcius (double a) throws RemoteException;
double KelvinFahrenheit (double a) throws RemoteException;
double AtmosPascal (double a) throws RemoteException;
double AtmosPSI (double a) throws RemoteException;
double PascalAtmos  (double a) throws RemoteException;
double PascalPSI  (double a) throws RemoteException;
double PSIAtmos  (double a) throws RemoteException;
double PSIPascal  (double a) throws RemoteException;   
}

这是远程方法

converterImp.java

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;



public class converterImp extends UnicastRemoteObject implements converter {



public converterImp() throws RemoteException
{

}

   double convert;


@Override
public double CelciusKelvin(double a) throws RemoteException {
    convert = a+273.15;
    return convert;
}

@Override
public double CelciusFahrenheit(double a) throws RemoteException {
   convert = (a*1.8)+32;
   return convert;
}

@Override
public double FahrenheitKelvin(double a) throws RemoteException {
    convert = (a+459.67)*5/9;
    return convert;
}

@Override
public double FahrenheitCelcius(double a) throws RemoteException {
    convert=(a-32)/(9/5);
    return convert;
}

@Override
public double KelvinCelcius(double a) throws RemoteException {
    convert = a - 273.15;
    return convert;
}

@Override
public double KelvinFahrenheit(double a) throws RemoteException {
    convert=(a-273.15)* 1.8 + 32.00;
    return convert;
}

@Override
public double AtmosPascal(double a) throws RemoteException {
    convert = a*101325;
    return convert;
}

@Override
public double AtmosPSI(double a) throws RemoteException {
   convert = a*14.6959488;
   return convert;
}

@Override
public double PascalAtmos(double a) throws RemoteException {
   convert = a/101325; 
   return convert;
}

@Override
public double PascalPSI(double a) throws RemoteException {
    convert=a*0.000145037;
    return convert;
}

@Override
public double PSIAtmos(double a) throws RemoteException {
    convert = a*0.0680459639;
    return convert;
}

@Override
public double PSIPascal(double a) throws RemoteException {
   convert =a*6894.75729;
   return convert; 
}

}

这是我的 GUI 客户端。

package projectrmiclient;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import rmi.converter;

public class ProjectRMIClient extends javax.swing.JFrame {


public ProjectRMIClient() {
    initComponents();
}
String num = "";
String str = "";



@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jScrollPane1 = new javax.swing.JScrollPane();
    jTextPane1 = new javax.swing.JTextPane();
    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();
    jButton3 = new javax.swing.JButton();
    jButton4 = new javax.swing.JButton();
    jButton5 = new javax.swing.JButton();
    jButton6 = new javax.swing.JButton();
    jButton7 = new javax.swing.JButton();
    jButton8 = new javax.swing.JButton();
    jButton9 = new javax.swing.JButton();
    jButton10 = new javax.swing.JButton();
    jButton11 = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jButton12 = new javax.swing.JButton();
    jButton13 = new javax.swing.JButton();
    jButton14 = new javax.swing.JButton();
    jButton15 = new javax.swing.JButton();
    jButton16 = new javax.swing.JButton();
    jButton17 = new javax.swing.JButton();
    jButton18 = new javax.swing.JButton();
    jButton19 = new javax.swing.JButton();
    jButton20 = new javax.swing.JButton();
    jButton21 = new javax.swing.JButton();
    jButton22 = new javax.swing.JButton();
    jButton23 = new javax.swing.JButton();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jLabel4 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jTextPane1.setEditable(false);
    jScrollPane1.setViewportView(jTextPane1);

    jButton1.setText("1");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    jButton2.setText("2");
    jButton2.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton2ActionPerformed(evt);
        }
    });

    jButton3.setText("3");
    jButton3.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton3ActionPerformed(evt);
        }
    });

    jButton4.setText("4");
    jButton4.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton4ActionPerformed(evt);
        }
    });

    jButton5.setText("5");
    jButton5.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton5ActionPerformed(evt);
        }
    });

    jButton6.setText("6");
    jButton6.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton6ActionPerformed(evt);
        }
    });

    jButton7.setText("7");
    jButton7.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton7ActionPerformed(evt);
        }
    });

    jButton8.setText("8");
    jButton8.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton8ActionPerformed(evt);
        }
    });

    jButton9.setText("9");
    jButton9.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton9ActionPerformed(evt);
        }
    });

    jButton10.setText("0");
    jButton10.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton10ActionPerformed(evt);
        }
    });

    jButton11.setText("Cancel");
    jButton11.setToolTipText("");
    jButton11.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton11ActionPerformed(evt);
        }
    });

    jLabel1.setText("Temperature");

    jButton12.setText("C~F");
    jButton12.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton12ActionPerformed(evt);
        }
    });

    jButton13.setText("F~C");

    jButton14.setText("K~C");

    jButton15.setText("C~K");

    jButton16.setText("F~K");

    jButton17.setText("K~F");

    jButton18.setText("A~PSI");

    jButton19.setText("PSI~A");

    jButton20.setText("Pas~A");

    jButton21.setText("A~Pas");

    jButton22.setText("PSI-Pas");
    jButton22.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton22ActionPerformed(evt);
        }
    });

    jButton23.setText("Pas~A");

    jLabel2.setText("Pressure");

    jLabel3.setText("Result");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                .addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jLabel3, javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 205, Short.MAX_VALUE)
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGroup(layout.createSequentialGroup()
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                .addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jButton11)
                                .addGroup(layout.createSequentialGroup()
                                    .addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                    .addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                    .addGap(36, 36, 36)))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addComponent(jButton18, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jButton19, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton20, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                        .addComponent(jButton22, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton21, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton23, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jButton14, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                        .addComponent(jButton16, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton15, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addComponent(jLabel2))
            .addContainerGap(20, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(34, 34, 34)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton3)
                        .addComponent(jButton2)
                        .addComponent(jButton1))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton4)
                        .addComponent(jButton5)
                        .addComponent(jButton6))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton7)
                        .addComponent(jButton8)
                        .addComponent(jButton9))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton11)
                        .addComponent(jButton10))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                    .addComponent(jLabel3))
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jLabel1)
                    .addGap(7, 7, 7)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton15)
                        .addComponent(jButton12))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton16)
                        .addComponent(jButton13))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton17)
                        .addComponent(jButton14))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(jLabel2)
                    .addGap(18, 18, 18)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton18)
                        .addComponent(jButton21))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jButton22)
                        .addComponent(jButton19))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton20)
                        .addComponent(jButton23))))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(20, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>                        

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);

}                                        

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);
}                                        

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                        

private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    str = evt.getActionCommand();
    num = num + str;
    jTextPane1.setText(num);// TODO add your handling code here:
}                                         

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    jTextPane1.setText("");
}                                         

private void jButton22ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    // TODO add your handling code here:
}                                         

private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {                                          
     try {
        // fire to localhost port 1099
        Registry myRegistry = LocateRegistry.getRegistry("127.0.0.1", 1099);

        // search for myMessage service
        converter impl = (converter) myRegistry.lookup("PTConverter");

        if(!jTextPane1.getText().isEmpty())
        {
            double input = Double.parseDouble(jTextPane1.getText());
            // call server's method  
            double result=impl.CelciusFahrenheit(input);
            String answer = result + "Fahrenheit";
            jLabel4.setText(answer);

        }




    } catch (Exception e) {
        e.printStackTrace();
    }       
}                                         

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* 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(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new ProjectRMIClient().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton11;
private javax.swing.JButton jButton12;
private javax.swing.JButton jButton13;
private javax.swing.JButton jButton14;
private javax.swing.JButton jButton15;
private javax.swing.JButton jButton16;
private javax.swing.JButton jButton17;
private javax.swing.JButton jButton18;
private javax.swing.JButton jButton19;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton20;
private javax.swing.JButton jButton21;
private javax.swing.JButton jButton22;
private javax.swing.JButton jButton23;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextPane jTextPane1;
// End of variables declaration                   
}

我使用 Netbeans 上的 GUI Builder 开发了 GUI。问题是当我按下 jButton12 时。它将显示所述错误。

最佳答案

您似乎已在客户端的不同包中创建了远程接口(interface)的副本。你不能那样做。双方的远程接口(interface)必须相同:相同，并且不包括更改其包或任何其他内容。

关于java - RMI ClassCastException 到远程接口(interface)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37759927/

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java - java Java 有手动垃圾回收吗？
好的，今天我在接受采访，我已经编写 Java 代码多年了。采访中说“Java 垃圾收集是一个棘手的问题，我有几个 friend 一直在努力弄清楚。你在这方面做得怎么样？”。她是想骗我吗？还是我的一生都
java - Java 之谜 - Java
我的 friend 给了我一个谜语让我解开。它是这样的: There are 100 people. Each one of them, in his turn, does the following
java - Java 字节码是否兼容不同版本的 Java？
如果我将使用 Java 5 代码的应用程序编译成字节码，生成的 .class 文件是否能够在 Java 1.4 下运行？如果后者可以工作并且我正在尝试在我的 Java 1.4 应用程序中使用 Jav
java - Java 缺少无符号原始类型是 Java 平台的特征还是 Java 语言的特征？
有关于why Java doesn't support unsigned types的问题以及一些关于处理无符号类型的问题。我做了一些搜索，似乎 Scala 也不支持无符号数据类型。限制是Java和S
java - Java 7 的 Java 字节码可以在其他版本的 Java 中工作吗
我只是想知道在一个 java 版本中生成的字节码是否可以在其他 java 版本上运行最佳答案通常，字节码无需修改即可在较新版本的 Java 上运行。它不会在旧版本上运行，除非您使用特殊参数 (
java -cp 。 test.java 与 java test.java
我有一个关于在命令提示符下执行 java 程序的基本问题。在某些机器上我们需要指定 -cp 。 (类路径)同时执行java程序 (test为java文件名与.class文件存在于同一目录下) jav
java - 使用 Java (Java EE/Java SE) 的数据库应用程序设计模式
我已经阅读 StackOverflow 有一段时间了，现在我才鼓起勇气提出问题。我今年 20 岁，目前在我的家乡(罗马尼亚克卢日-纳波卡)就读 IT 大学。足以介绍:D。基本上，我有一家提供簿记应用
java - Java 中的解析可在 Java 中访问
我有 public JSONObject parseXML(String xml) { JSONObject jsonObject = XML.toJSONObject(xml); r
java - Java 中的解释性语言以及对 Java 方法的调用
我已经在 Java 中实现了带有动态类型的简单解释语言。不幸的是我遇到了以下问题。测试时如下代码: def main() { def ks = Map[[1, 2]].keySet()
java - java 序数 - Java I 类
一直提示输入 1 到 10 的数字 - 结果应将 st、rd、th 和 nd 添加到数字中。编写一个程序，提示用户输入 1 到 10 之间的任意整数，然后以序数形式显示该整数并附加后缀。 public
java - 如何从 Java 执行 Java？
我有这个 DownloadFile.java 并按预期下载该文件: import java.io.*; import java.net.URL; public class DownloadFile {
java - 延迟不适用于 java gui(java)
我想在 GUI 上添加延迟。我放置了 2 个 for 循环，然后重新绘制了一个标签，但这 2 个 for 循环一个接一个地执行，并且标签被重新绘制到最后一个。我能做什么？ for(int i=0;
java - Java 类中的硬编码 Java 列表
我正在对对象 Student 的列表项进行一些测试，但是我更喜欢在 java 类对象中创建硬编码列表，然后从那里提取数据，而不是连接到数据库并在结果集中选择记录。然而，自从我这样做以来已经很长时间了，
java - java 幕后对象创建(java 对象实例化)
我知道对象创建分为三个部分: 声明实例化初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化它必须使用
java - 车辆跟踪系统[java/Java EE]
我有兴趣使用 GPRS 构建车辆跟踪系统。但是，我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗？人们意识到任何问题吗？我计划使用 Java/Java EE - 有更好的技术吗？如果
java - 逆数组(Java)//逆数组(Java)
我可以通过递归方法反转数组，例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组，我不知道为什么，请帮助我。 public class Recursion { p
java - Java/Java EE 的构建和集成环境
有这样的标准方式吗？包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器最后我希望有一个自动构建和集成环境。
java - 我将如何从 java 程序打印文本？ ( java )
我什至不知道这是否可能，我非常怀疑它是否可能，但如果可以，您能告诉我怎么做吗？我只是想知道如何从打印机打印一些文本。有什么想法吗？最佳答案这里有更简单的事情。 import javax.swin

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java - RMI ClassCastException 到远程接口(interface)