java - Netbeans 中的 ClassNotFoundException

Question

我的项目中有这些包:

在 AnalysisLab 类中调用 File_Intestazione 时，出现 ClassNotFoundException。看一下这段代码:

import ServicesFiles.File_Intestazione;
import java.io.FileNotFoundException;
import java.io.IOException;

public class AnalysisLab
{        
    public static void main(String[] args)
    {
        try
        {
            new AnalysisLab().verifica_licenza();
        }
        catch(FileNotFoundException e){JOptionPane.showMessageDialog(null,"Impossibile trovare il file intestazione.dat"); System.exit(0);}
        catch(IOException e){JOptionPane.showMessageDialog(null,"Errore durante la lettura da file intestazione.dat"); System.exit(0);}
        catch(ClassNotFoundException e){JOptionPane.showMessageDialog(null,"ClassNotFoundException"); e.printStackTrace(); System.exit(0);}
    }

    public void verifica_licenza() throws FileNotFoundException, IOException, ClassNotFoundException
    {
        File_Intestazione fIntestazione = new File_Intestazione();
    }
}

所以，当我执行我的程序时，我遇到了这个异常(exception):

java.lang.ClassNotFoundException: analysislab.File_Intestazione
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:686)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1866)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1749)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2040)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
at ServicesFiles.File_Intestazione.<init>(File_Intestazione.java:26)
at Temp.AnalysisLab.verifica_licenza(AnalysisLab.java:42)
at Temp.AnalysisLab.main(AnalysisLab.java:25)

Answer 1

它正在不同的包中寻找具有该名称的类:

java.lang.ClassNotFoundException: analysislab.File_Intestazione

您的类(class)是ServicesFiles.File_Intestazione。

此错误应该在全新重建中显示为编译错误(如果确实存在)，但看起来上面的代码正在读取某种过时的序列化对象类定义。

删除/重新创建那些序列化的对象文件，它应该可以工作。