RFR(S): 8150782: findClass / accessClass throw unexpected exceptions

[Michael Haupt]

Dear all,

please review this change.
Bug: https://bugs.openjdk.java.net/browse/JDK-8150782
Webrev: http://cr.openjdk.java.net/~mhaupt/8150782/webrev.00/

The unexpected exceptions turned out to be non-issues; however it was advisable to add some explanations to the API documentation. Also, the change contains some tests that illustrate these cases.

CCC approval is pending.

Thanks,

Michael

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