Java Language Instantiating sun.misc.Unsafe via reflection


Example

public static Unsafe getUnsafe() {
    try {
        Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
        unsafe.setAccessible(true);
        return (Unsafe) unsafe.get(null);
    } catch (IllegalAccessException e) {
        // Handle
    } catch (IllegalArgumentException e) {
        // Handle
    } catch (NoSuchFieldException e) {
        // Handle
    } catch (SecurityException e) {
        // Handle
    }
}

sun.misc.Unsafe has a Private constructor, and the static getUnsafe() method is guarded with a check of the classloader to ensure that the code was loaded with the primary classloader. Therefore, one method of loading the instance is to use reflection to get the static field.