AccessControlContext.equals(Object obj) gets a null pointer exception if
obj is an AccessController with a null context.

See the underlined line below:


if (context == null) {
return (that.context == null);
}

boolean match;
for (int i = 0; i < this.context.length; i++) {
match = false;
for (int j = 0; (j < that.context.length) && !match; j++) {
                           --------------------------
match =
((this.context[i] == null) && (that.context[j] == null)) ||
(this.context[i].equals(that.context[j]));
}
if (!match) return false;
}