Problem with serialization

Newbie & Debugging Questions
#1

Hi,

I have a problem with serialization. Some users of my game experience crashes when attempting to serialize or deserialize the world. One user reported a stackoverflowerror while another user reported a massive fps frop after saving followed by a crash 2 seconds later.
I can’t replicate this crash because it seems to work perfectly fine for most users including myself.

here is the code:



    public static void saveWorld(R_Object[] groundtile_list, String foldername, String filename, String extension)
    {
        boolean savedsucces = false;
        String temp_pathname = foldername+"\\"+filename+"_temp"+extension;

        try (FileOutputStream fos = new FileOutputStream(temp_pathname)) {
            //File outputsteam saves to file
            //objectoutputstream does serialization
            try (ObjectOutputStream out = new ObjectOutputStream(fos)) {
                out.writeObject(groundtile_list);    
                savedsucces = true;
            }
            catch(IOException e) {
                System.out.println(e.toString());
                JOptionPane.showMessageDialog(null, "objectoutputstream error: "+e.toString());
            } 
            catch(Exception e) {
                System.out.println(e.toString());
                JOptionPane.showMessageDialog(null, "objectoutputstream error: "+e.toString());
            }   
        }
        catch(IOException e) {
            System.out.println(e.toString());
            JOptionPane.showMessageDialog(null, "fileoutputstream error: "+e.toString());
        } 
        catch(Exception e) {
            System.out.println(e.toString());
            JOptionPane.showMessageDialog(null, "fileoutputstream error: "+e.toString());
        }     
        
        if (savedsucces == true) {
            try {
                File folder = DopplerMath.getFolder(foldername+"\\");
                File filetemp = DopplerMath.getFile(folder, filename+"_temp", extension);

                //delete old save if it exist
                File fileold = DopplerMath.getFile(folder, filename, extension);
                if (fileold != null) {
                    fileold.delete();
                }

                filetemp.renameTo(new File(foldername+"\\"+filename+extension));    
            }
            catch(Exception e) {
                JOptionPane.showMessageDialog(null, "failed to save world: "+e.toString());
            }
        }  
    }  

    public static R_Object[] loadWorld(String filename)
    {
        R_Object[] groundtilelist = null;
        
        try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(filename))) {
            groundtilelist = (R_Object[]) in.readObject();   
            return(groundtilelist);
        }
        catch(IOException | ClassNotFoundException e) {
            JOptionPane.showMessageDialog(null, "failed to load world: "+e.toString());
        } 
        catch(Exception e) {
            JOptionPane.showMessageDialog(null, "failed to load world: "+e.toString());
        } 
        return(groundtilelist);  
    }

Am I doing something wrong here?
I have been googling for an answer but could not find any.
My guess would be that the person experiencing the stackoverflow somehow starts the application with a lower maximum stack size.