AccessbileObject setAccessible array version vs non-array version

Jochen Theodorou blackdrag at
Sat Dec 10 18:11:39 UTC 2016

On 10.12.2016 13:08, Alan Bateman wrote:
> On 10/12/2016 09:13, Jochen Theodorou wrote:
>> Hi all,
>> motivated by the recent "Java 9 build 148 causes trouble in Apache
>> Lucene/Solr/Elasticsearch" thead, I thought I ask... there is
>> AcccessibleObject#setAccessible(boolean), which will ask the
>> SecurityManager for permissions and then make itself accessible
>> according to the boolean flag. the array version takes an array of
>> AccessibleObjects, asks the security manager *once* and then makes all
>> of them accessible. So if you are in need to make a lot of objects
>> accessible the array version is superior in performance.
>> Now with jigsaw it is no longer a all or nothing for the class, now
>> single methods or fields may no longer be made accessible, even
>> without security manager. That means that even without a security
>> manager set using the array version on File for example will fail with
>> an exception (unless the module is opened from the command line, but
>> we should leave that out for now)
>> My question now basically is the following... why is this method not
>> made deprecated? It is kind of useless now, even misleading I would say.
> I'm not sure that I understand your mail. The permission check when
> running with a security manager has not changed. If you use the array
> version then there is one permission check.
> Maybe you mean that the array version will fail when the array contains
> at least one element where the access check cannot be suppressed? That
> is possible of course. You mentioned File and maybe you mean you the
> array has a mix of public methods and non-public members and fields?

yes. You will not need to set them to accessible for public members 
after all

bye Jochen

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