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Thread: Error concerning Object Serialization for i/o

  1. #1
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    Default Error concerning Object Serialization for i/o

    The next code concerning Object Serialization produces, when using Netbeans, the following error (no error marking in the code itself). What is this error about?

    Exception in thread "main" java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file networking/Employee
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader. java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java :615)
    at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader .java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader. java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:3 06)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:2 47)
    at networking.ObjectRefTest.main(ObjectRefTest.java:2 5)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 3 seconds)

    Here is the complete code:

    package networking;
     
    /**
     *
     * 
     */
    /**
       @version 1.10 17 Aug 1998
       @author Cay Horstmann
    */
     
     
    import java.io.*;
    import java.util.*;
     
    class ObjectRefTest
    {
       public static void main(String[] args)
       {
          Employee harry = new Employee("Harry Hacker", 50000, 1989, 10, 1);
          Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);
          boss.setSecretary(harry);
     
          Employee[] staff = new Employee[3];
     
          staff[0] = boss;
          staff[1] = harry;
          staff[2] = new Employee("Tony Tester", 40000, 1990, 3, 15);
     
          try
          {
             // save all employee records to the file employee.dat
             ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("employee.dat"));
             out.writeObject(staff);
             out.close();
     
             // retrieve all records into a new array
             ObjectInputStream in =  new ObjectInputStream(new FileInputStream("employee.dat"));
             Employee[] newStaff = (Employee[]) in.readObject();
             in.close();
     
             // raise secretary's salary
             newStaff[1].raiseSalary(10);
     
             // print the newly read employee records
             for (Employee e : newStaff)
                System.out.println(e);
          }
          catch (Exception e)
          {
             e.printStackTrace();
          }
       }
    }
     
    class Employee implements Serializable
    {
       public Employee() {}
     
       public Employee(String n, double s, int year, int month, int day)
       {
          name = n;
          salary = s;
          GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
          hireDay = calendar.getTime();
       }
     
       public String getName()
       {
          return name;
       }
     
       public double getSalary()
       {
          return salary;
       }
     
       public Date getHireDay()
       {
          return hireDay;
       }
     
       public void raiseSalary(double byPercent)
       {
          double raise = salary * byPercent / 100;
          salary += raise;
       }
     
       public String toString()
       {
          return getClass().getName()
             + "[name=" + name
             + ",salary=" + salary
             + ",hireDay=" + hireDay
             + "]";
       }
     
       private String name;
       private double salary;
       private Date hireDay;
    }
     
    class Manager extends Employee
    {
       /**
          Constructs a Manager without a secretary
          @param n the employee's name
          @param s the salary
          @param year the hire year
          @param month the hire month
          @param day the hire day
       */
       public Manager(String n, double s, int year, int month, int day)
       {
          super(n, s, year, month, day);
          secretary = null;
       }
     
       /**
          Assigns a secretary to the manager.
          @param s the secretary
       */
       public void setSecretary(Employee s)
       {
          secretary = s;
       }
     
       public String toString()
       {
          return super.toString()
            + "[secretary=" + secretary
            + "]";
       }
     
       private Employee secretary;
    }


    --- Update ---

    I might have a problem with Netbeans 6.9
    Now, of a program that worked fine, I get this cryptic message:


    run:
    Exception in thread "main" java.lang.NoSuchMethodError: networking.Manager.setBonus(D)V
    at networking.ObjectFileTest.main(ObjectFileTest.java :21)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 0 seconds)


  2. #2
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    Default Re: Error concerning Object Serialization for i/o

    What is the name of the source file? Is it Employee.java? It should be ObjectRefTest.java.

    Never mind. Didn't see the update. I have no idea.

  3. #3
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    Default Re: Error concerning Object Serialization for i/o

    the class name is:
    class ObjectFileTest
    {
    public static void main(String[] args)

    The name of the file is: ObjectFileTest.java

    The above code is working and now I have an error with this one:

    package networking;
     
    /**
       @version 1.11 2004-05-11
       @author Cay Horstmann
    */
     
    import java.io.*;
    import java.util.*;
     
    class ObjectFileTest
    {
       public static void main(String[] args)
       {
          Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);
          boss.setBonus(5000);
     
          Employee[] staff = new Employee[3];
     
          staff[0] = boss;
          staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);
          staff[2] = new Employee("Tony Tester", 40000, 1990, 3, 15);
     
          try
          {
             // save all employee records to the file employee.dat
             ObjectOutputStream out = new ObjectOutputStream(new
    							FileOutputStream("employee.dat"));
             out.writeObject(staff);
             out.close();
     
             // retrieve all records into a new array
             ObjectInputStream in =  new ObjectInputStream(new
    						FileInputStream("employee.dat"));
             Employee[] newStaff = (Employee[]) in.readObject();
             in.close();
     
    	    // give an 10% raise to new object
     	    for (int i = 0; i < newStaff.length ; i++) {
                newStaff[i].raiseSalary(10);
             }
     
             // print the newly read employee records
             for (Employee e : newStaff)
                System.out.println(e);
          }
          catch (Exception e)
          {
             e.printStackTrace();
          }
       }
    }
     
    class Employee implements Serializable
    {
       public Employee() {}
     
       public Employee(String n, double s, int year, int month, int day)
       {
          name = n;
          salary = s;
          GregorianCalendar calendar =
    				new GregorianCalendar(year, month - 1, day);
          hireDay = calendar.getTime();
       }
     
       public String getName()
       {
          return name;
       }
     
       public double getSalary()
       {
          return salary;
       }
     
       public Date getHireDay()
       {
          return hireDay;
       }
     
       public void raiseSalary(double byPercent)
       {
          double raise = salary * byPercent / 100;
          salary += raise;
       }
     
       public String toString()
       {
          return getClass().getName()
             + "[name=" + name
             + ",salary=" + salary
             + ",hireDay=" + hireDay
             + "]";
       }
     
       private String name;
       private double salary;
       private Date hireDay;
    }
     
     
    class Manager extends Employee
    {
       /**
          @param n the employee's name
          @param s the salary
          @param year the hire year
          @param month the hire month
          @param day the hire day
       */
       public Manager(String n, double s, int year, int month, int day)
       {
          super(n, s, year, month, day);
          bonus = 0;
       }
     
       public double getSalary()
       {
          double baseSalary = super.getSalary();
          return baseSalary + bonus;
       }
     
       public void setBonus(double b)
       {
          bonus = b;
       }
     
       public String toString()
       {
          return super.toString()
            + "[bonus=" + bonus
            + "]";
       }
     
       private double bonus;
    }


    --- Update ---

    To be clear, when running the above code I get this error (no error mark in the code itself):

    Exception in thread "main" java.lang.NoSuchMethodError: networking.Manager.setBonus(D)V
    at networking.ObjectFileTest.main(ObjectFileTest.java :21)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 0 seconds)

  4. #4
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    Default Re: Error concerning Object Serialization for i/o

    Hello.
    I executed your code on Netbeans 7.3 IDE.
    It executed without any exceptions.

    Syed.

  5. #5
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    Default Re: Error concerning Object Serialization for i/o

    weird, because the code is from the middle ages! I might have to go to 7.3
    I update or do I have to do a new installation?
    Doas 7.3 run on Mac 10.6.8?

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