Problems serializing/de-serializing a class that uses a Treemap.

Question

I'm working on a project that is basically just an exercise logbook, its fairly straightforward. You input the "exercises" done on a particular "workout", the "workout" itself is a list of the exercises and the date in which they were done. Then, the "workout" is added into the "workoutlog", which is just a class that contains a Treemap, that uses the date of the workout as the key and the "workout" as the value. Finally, the "workoutlog", is serialized and voila you have a record of your workouts.

The problem is that when de-serializing I'm getting a class cast exception and thus cannot review all the workouts added to the workoutlog. Now, I know its serializing correctly because I checked the file where the workouts should be being written to and they are all there. The problem seems to be when de-serializing something causes the class cast exception. Any insight would be super appreciated, this is starting to give me a headache haha.

Here are the relevant lines of code:

This is the workoutlog class:

/*
This class is the actual log book that will be stored. It is a treemap, so it will be organized by key values.
The key will take a String value that will be the formatted date from the workout date member variable.
*/

public class WorkoutLog implements Serializable{
public TreeMap < String , Workout > mWorkoutLog;

    // this is the actual Workoutlog

    public WorkoutLog(){
        mWorkoutLog = new TreeMap<>();
    }
    public TreeMap < String, Workout> getWorkoutLog(){
        return mWorkoutLog;
    }
}

This is where the error is occurring:

  case Logger.CHECK_KEY:

               try {

                    workoutLog = (WorkoutLog) SerializationUtil.deserialize(file);
                    System.out.println("Deserializing from:..." + file.getName());
                    System.out.println(workoutLog.getWorkoutLog().keySet()+"");


                } catch(EOFException e){
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
                break;

[MOD: added ```java formatting -cf]

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Alejandro Crespo

Alejandro Crespo

Problems serializing/de-serializing a class that uses a Treemap.