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hello dear colleagues, I have a Garden class in which I serialize and deserialize multiple Plant class objects. The serializing is working but the deserializing is not working if a want to assign it to calling variable in the mein static method. public void searilizePlant(ArrayList<Plant> _plants) { try { FileOutputStream fileOut = new FileOutputStream(fileName); ObjectOutputStream out = new ObjectOutputStream(fileOut); for (int i = 0; i < _plants.size(); i++) { out.writeObject(_plants.get(i)); } out.close(); fileOut.close(); } catch (IOException ex) { } } deserializing code: public ArrayList<Plant> desearilizePlant() { ArrayList<Plant> plants = new ArrayList<Plant>(); Plant _plant = null; try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName)); Object object = in.readObject(); // _plant = (Plant) object; // TODO: ITERATE OVER THE WHOLE STREAM while (object != null) { plants.add((Plant) object); object = in.readObject(); } in.close(); } catch (IOException i) { return null; } catch (ClassNotFoundException c) { System.out.println("Employee class not found"); return null; } return plants; } My invoking code: ArrayList<Plant> plants = new ArrayList<Plant>(); plants.add(plant1); Garden garden = new Garden(); garden.searilizePlant(plants); // THIS IS THE PROBLEM HERE ArrayList<Plant> dp = new ArrayList<Plant>(); dp = garden.desearilizePlant(); edit I got a null Pointer exception The solution of @NilsH is working fine, thanks!

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