RFR: 8303530: Add system property for custom JAXP configuration file [v2]

[Joe Wang]

On Mon, 13 Mar 2023 11:34:50 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Joe Wang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   clean up tests; fix copy&paste error.
>
> src/java.xml/share/classes/module-info.java line 89:
> 
>> 87:  * the StAX factories for the <a href="#LookupMechanism">Factory Lookup Mechanism</a>
>> 88:  * only. The files, if exist, are typically located in the {@code conf}
>> 89:  * directory of the Java installation.
> 
> If jdk.xml.config.file is not set, should the reader assume it's default value is ${java.home}/conf/jaxp.properties? If so, they this is an implementation specific default, right?

Both API and Impl, will make it clearer, and add a section under the implNote section.

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PR: https://git.openjdk.org/jdk/pull/12985