RFR: 8273660: De-Serialization Stack is suppressing ClassNotFoundException

[Julia Boes]

On Wed, 20 Oct 2021 21:57:29 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> The ObjectInputStream.GetField method `get(String name, Object val)` should have been throwing
> a ClassNotFoundException if the class was not found.  Instead the implementation was returning null.
> A design error does not allow the `get(String name, Object val)`  method to throw CNFE as it should.
> However, an exception must be thrown to prevent invalid data from being returned.
> Wrapping the CNFE in IOException allows it to be thrown and the exception handled.
> The call to `get(String name, Object val)`  is always from within a `readObject` method
> so the deserialization logic can catch the IOException and unwrap it to handle the CNFE.

LGTM

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PR: https://git.openjdk.java.net/jdk/pull/6053