java.lang.NoClassDefFoundError (javac compilation error)

Name: tb29552 Date: 06/18/97


1.just javac MyApp.java
2.code for MyApp.java:
-------------------
import java.io.*;
import java.lang.*;

class MyApp {

  public static PasswordSecurityManager PSM = new PasswordSecurityManager("abraca");
  
  private static Secret a_secret;
  
   public static String nom_fichier = "secret.txt";

  public static void main(String[] args) {
    // Firstly, set the security manager
    try {
      System.setSecurityManager(PSM) ;
    } catch ( SecurityException se1) {
      System.out.println("SecurityManager already set!");
    };
    // create the object to protect ( class Secret)
    creerSecret();
    //crypt it
    //serialize it
    //or implement checkSerialize in PMS
    saveSecretOnDisk();

  }


  private static void saveSecretOnDisk(){
    try {
      FileOutputStream f = new FileOutputStream(nom_fichier);
      ObjectOutput s = new ObjectOutputStream(f);
      // verifie les droits de serialiser
      //PSM.checkWriteObject(a_secret);
      //System.out.println("droits verifies");
      // serialise le secret
      // s.writeObject("le secret est:");
      //System.out.println("serialize le header:ok");
      s.writeObject(a_secret);
      // System.out.println("serialize le secret:ok");
      s.flush();
      s.close();
      f.close();
    } catch (java.io.IOException ie) {
      System.out.println("Pb pour ouvrir un stream sur fichier");
    } catch ( SecurityException se) {
      System.out.println("SecurityManager said:not allowed to write secrets on the disk!");
    }
  }

  private static void loadSecretFromDisk(){
    try {
      FileInputStream in = new FileInputStream(nom_fichier);
      ObjectInputStream s = new ObjectInputStream(in);
      String header = (String)s.readObject();
      Secret the_secret = (Secret)s.readObject();
    } catch (Exception ea){};
  }
  

  private static void creerSecret(){
    DataInputStream dis = new DataInputStream(System.in);
    System.out.println("Donner le secret:");
    try{
      a_secret = new Secret( dis.readLine());
    } catch (java.io.IOException ioe) {};
  }
}
-------------------------
end of code of MyApp.java
begining of code of PasswordSecurityManager.java
-------------------------

import java.io.*;

class PasswordSecurityManager extends SecurityManager {

    private String password;

    PasswordSecurityManager(String password) {
        super();
        this.password = password;
    }

    private boolean accessOK() {
        int c;
        DataInputStream dis = new DataInputStream(System.in);
        String response;

        System.out.println("What's the secret password?");
        try {
            response = dis.readLine();
            if (response.equals(password))
                return true;
            else
                return false;
        } catch (IOException e) {
            return false;
        }
    }

  // my methods i added
  
  public void checkWriteObject(Secret a_secret) {
    if (!accessOK())
      throw new SecurityException("no right to write a secret");
  }

 public void checkReadObject(Secret a_secret) {
    if (!accessOK())
      throw new SecurityException("No right to read a secret");
  }
  // end of methods i added
  public void checkRead(FileDescriptor filedescriptor) {
    if (!accessOK())
      throw new SecurityException("Not a Chance!");
  }
  public void checkRead(String filename) {
        if (!accessOK())
            throw new SecurityException("No Way!");
    }
    public void checkRead(String filename, Object executionContext) {
        if (!accessOK())
            throw new SecurityException("Forget It!");
    }
    public void checkWrite(FileDescriptor filedescriptor) {
        if (!accessOK())
            throw new SecurityException("Not!");
    }
    public void checkWrite(String filename) {
        if (!accessOK())
            throw new SecurityException("Not Even!");
    }
}
----------------------
end of code of PasswordSecurityManager.java
begining of code of Secret.java
---------------------
class Secret extends Object implements java.io.Serializable {
  
  private static String this_is_the_secret;
// should have put transient to protect it from serialization
  
  Secret(String a_new_secret){
    super();
    this.this_is_the_secret = a_new_secret;
  }
    
  // public static void writeObject(){
  //this_is_the_secret.writeObject();
  //}
}

---------------------------
end of Secret.java
end of all code source

3. exact message:
# javac MyApp.java
java.lang.NoClassDefFoundError: sun/tools/asm/Instruction
        at sun.tools.asm.Assembler.<init>(Assembler.java)
        at sun.tools.javac.SourceClass.compileClass(SourceClass.java)
        at sun.tools.javac.SourceClass.compile(SourceClass.java)
        at sun.tools.javac.Main.compile(Main.java)
        at sun.tools.javac.Main.main(Main.java)
error: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
Note: MyApp.java uses a deprecated API. Recompile with "-deprecation" for details.
1 error, 1 warning

company - university of bologna , email - ###@###.###
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