n0n [0, 4, 6]

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.grow(Unknown Source)
at java.util.ArrayList.ensureExplicitCapacity(Unknown Source)
at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at guessingTool.CheckProgram.main(CheckProgram.java:103)

for (int i = 0; i < 5; i++) {

        index = randomGenerator.nextInt(valuesList.size());
        value = valuesList.get(index);

        finalValue = "";
        positions.clear();
        for (int j = 0; j < 3; j++) {
        index = randomGenerator.nextInt(value.length());
        valueChar = value.charAt(index);
        positions.add(index);

        if (j == 0) {
            finalValue += Character.toString(valueChar);
        }
        else if (j == 1) {
            if (positions.get(0) != positions.get(1)) {
                finalValue += Character.toString(valueChar);
            }
            else {
                while (positions.get(0) == positions.get(1)) {
                    index = randomGenerator.nextInt(value.length());
                    valueChar = value.charAt(index);
                    positions.add(index);
                }
            }
        }
        else if (j == 2) {
            if (positions.get(0) != positions.get(2) && positions.get(1) != positions.get(2)) {
                finalValue += Character.toString(valueChar);
            }
            else {
                while (positions.get(0) == positions.get(2) || positions.get(1) == positions.get(2)) {
                    index = randomGenerator.nextInt(passcode.length());
                    valueChar = value.charAt(index);
                    positions.add(index);
                }
            }
        }

        }
        System.out.println(finalValue + " " + positions);
}