RFR: 8215916: The failure reason of an optional JAAS LoginModule is not logged [v3]

[Jayashree Huttanagoudar]

On Thu, 4 Aug 2022 01:40:36 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> BTW, have you reverted your change on `LoginContext.java`. I remembered we agreed that this bug is all about debug info instead of updating the exception thrown.

Actually here: https://bugs.openjdk.org/browse/JDK-8215916?jql=labels%20%3D%20starter-bug , the ask is that its better to print the stack trace of an exception so I didn't revert it back. And sorry I didn't mention that in the conversation. 
Already the `debug.println` is there for `OPTIONAL` section here: https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/javax/security/auth/login/LoginContext.java#L880 where `debug!=null`.

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PR: https://git.openjdk.org/jdk/pull/9159