RFR: 8265372: Simplify PKCS9Attribute [v2]

[Ben Perez]

On Wed, 10 Jan 2024 02:53:15 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>> src/java.base/share/classes/sun/security/pkcs/PKCS9Attribute.java line 321:
>> 
>>> 319: 
>>> 320:         this.oid = oid;
>>> 321:         info = oidMap.get(oid);
>> 
>> What if `info` is `null` (there is no entry for the specified OID)? The prior code set the value class to `byte[]` in that case. I think we want to preserve that behavior.
>
> So, it seems that no test is triggering a NPE? Consider adding a test for covering this scenario?

This was caught by `sun/security/pkcs/pkcs9/UnknownAttribute.java` and has been fixed

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PR Review Comment: https://git.openjdk.org/jdk/pull/17132#discussion_r1449521516