How do I resolve the ClassCastException while retrieving an array of objects from a .txt file?

Question

I have created an array of objects of type Employee and i am putting the objects in a .txt file. Below is the method that accepts Employee objects a parameter and puts it into the .txt file

public void putDataintoFile(Employee[] obj) {
    File file = new File("employeedetails.txt");
    try {
        FileOutputStream fos = new FileOutputStream(file);
        try {
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(obj);
            oos.close();
            fos.close();
        } 
        catch (IOException ex) {
            Logger.getLogger(EmployeeService1.class.getName()).log(Level.SEVERE, null, ex);
        }
    } 
    catch (FileNotFoundException ex) {
        Logger.getLogger(EmployeeService1.class.getName()).log(Level.SEVERE, null, ex);
    }
}

This above method is invoked from a seperate "Execetor class " which then calls my getDataFromFile() method below

public void getDataFromFile() {
    System.out.println("Reached HERE");
    try {
        FileInputStream fin = new FileInputStream("employeedetails.txt");
        try {
            ObjectInputStream oin= new ObjectInputStream(fin);
            try {
                Employee    e =(Employee)oin.readObject();
                System.out.println("Reached HERE");
                System.out.println(e.toString());
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(EmployeeService1.class.getName()).log(Level.SEVERE, null, ex);
            }
            oin.close();
            fin.close();
        } 
        catch (IOException ex) {
            Logger.getLogger(EmployeeService1.class.getName()).log(Level.SEVERE, null, ex);
        }
    } 
    catch (FileNotFoundException ex) {
        Logger.getLogger(EmployeeService1.class.getName()).log(Level.SEVERE, null, ex);
    }
}

On executign I get an error which says.

Exception in thread "main" java.lang.ClassCastException: [LMypackage.Employee; cannot
be cast to Mypackage.Employee
at Mypackage.EmployeeService1.getDataFromFile(EmployeeService1.java:225)
at Mypackage.Executor.main(Executor.java:71)

I have implemented Serializable interface in my Employee Classs

Can anyone help me ?

Dave Newton · Accepted Answer · 2013-12-25 13:53:48Z

3

You're writing an array and trying to read a single object.

This is stated in the exception message, which leads to the read/write code, which is fairly obvious despite all the superfluous vertical whitespace.

Also, in general, don't call not-text files .txt.

answered Dec 25, 2013 at 13:53

Dave Newton

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2 Comments

Ananth Kumble Over a year ago

code Employee e[] = new Employee[2]; for(int i=0 ;i<2;i++) { e[i] =(Employee)oin.readObject(); System.out.println(e[i]); } code I tried this but still the same error

Ananth Kumble Over a year ago

its working I was not entering the objects into the file using a loop I changed my code putData() tofor(int i=0 ;i<2;i++) { oos.writeObject(obj[i]); } oos.close(); fos.close(); code and my getData method to code Employee e[] = new Employee[2]; for(int i=0 ;i<2;i++) { e[i] =(Employee)oin.readObject(); System.out.println(e[i]); } code

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