在线程“主” java.lang.IllegalAccessError中获取错误异常：

Question

My Directory Structure is shown below :

ObjectPassing
        |->student.txt
        |->StudentAddress.java
        |->StudentClient.java
        |->StudentServer.java
        |->StudentAddress.class
        |->StudentClient.class
        |->StudentServer.class

and i am getting error while running file StudentClient.java which contains instance of StudentAddress class.Server Started Successfully but client is not working properly.

Source Code : -

import java.net.Socket;
import java.io.ObjectOutputStream;

public class StudentClient{

  private String hostName;
  private int portNumber;
  private Socket client;

  public StudentClient(String th,int tp){

    this.hostName = th;
    this.portNumber = tp;

    try {
        client = new Socket(hostName,portNumber);
        ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
        StudentAddress data = new StudentAddress();
        data.getData();
        output.writeObject(data);

    } catch(Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
      new StudentClient("localhost",8000);
  }
}

All class StudentAddress,StudentServer,StudentClient are complied successfully.While Running StudentClient.java it show below error:

Command:javac StudentClient.java

Exception in thread "main" java.lang.IllegalAccessError: class StudentClient tried to access method StudentAddress.<init>()V (StudentClient is in unnamed module of loader com.sun.tools.javac.launcher.Main$MemoryClassLoader @5e57643e; StudentAddress is in unnamed module of loader 'app')

        at StudentClient.<init>(StudentClient.java:18)
        at StudentClient.main(StudentClient.java:27)

Answer 1

Oh wait, you are running javac from ObjectPassing directory, that's the issue. Run it from Networking directory.

When you mention package keyword, javac will expect a directory under the current directory from where you run it to contain the directory or directories for the package name mentioned.