RFR: 8282730: LdapLoginModule throw NPE from logout method after login failure

[Weijun Wang]

On Fri, 1 Jul 2022 17:31:06 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> Add null-checks in all `LoginModule` implementations. It's possible that an application calls `logout` after a login failure, where most internal variables for principals and credentials are null and removing a null from the `Subject`'s principals and credentials sets will trigger a `NullPointerException`.

New commits pushed. BTW, in the 2nd one, I reverted some `{@code null}` changes since it looks like "null" is used as an adjective here instead of a Java keyword. The same style appears multiple times in other places.

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PR: https://git.openjdk.org/jdk/pull/9348