How to change a private static final int field from outside the class in java using reflection

setFinalStatic.java

/**
     * Copied from <a href="https://stackoverflow.com/questions/2474017/using-reflection-to-change-static-final-file-separatorchar-for-unit-testing/2474242#2474242">Stack Overflow</a>
     * Do exercise extreme caution with this technique.
     *   Devastating consequences aside, the following actually works:
     *      <pre>{@code
     *      setFinalStatic(Boolean.class.getField("FALSE"), true);
     *      System.out.format("Everything is %s", false); // "Everything is true"}</pre>
     */
    static void setFinalStatic(Field field, Object newValue) throws Exception {
        field.setAccessible(true);

        // remove final modifier from field
        Field modifiersField = Field.class.getDeclaredField("modifiers");
        modifiersField.setAccessible(true);
        modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);

        field.set(null, newValue);
    }