RFR: 8283660: Convert com/sun/jndi/ldap/AbstractLdapNamingEnumeration.java finalizer to Cleaner [v6]

[Brent Christian]

On Sat, 23 Apr 2022 00:09:48 GMT, Brent Christian <bchristi at openjdk.org> wrote:

>> src/java.naming/share/classes/com/sun/jndi/ldap/AbstractLdapNamingEnumeration.java line 73:
>> 
>>> 71:         public void run() {
>>> 72:             if (enumClnt != null) {
>>> 73:                 enumClnt.clearSearchReply(res, homeCtx.reqCtls);
>> 
>> It's a bit strange to see that there is no guard here to verify that `homeCtx != null`, when line 76 implies that it might. My reading is that `homeCtxt` is not supposed to be `null` when `enumClnt` is not `null`. That could be explained in a comment, or alternatively asserted just before line 73 (`assert homeCtx != null;`)
>
> Yes, it is strange -- that code came from the finalizer. I will add an assert.

It appears that the update() method can set 'homeCtx' for 'ne' to null while leaving 'enumClnt' non-null (~L410).
Perhaps here, the clearSearchReply() call should only happen if both are non-null.

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PR: https://git.openjdk.java.net/jdk/pull/8311