RFR: 8215990: Avoid using reflection to create common default URLStreamHandlers

[Alan Bateman]

On 02/01/2019 10:43, Claes Redestad wrote:
> :
>
>>
>> While we're in the area then it would be nice to eliminate the use of 
>> Class::newInstance too - if each of the built-in protocol handlers is 
>> public with a public no-arg constructor then 
>> getConstructor().newInstance() should do it.
>
> To be perfectly compatible I think 
> .getDeclaredConstructor().newInstance() should be used:
>
> http://cr.openjdk.java.net/~redestad/8215990/jdk.01
This looks okay. Using getConstructor should work here too because this 
is the built-in protocol handlers. I think the only compatibility 
concern with getConstructor in this code path would be if someone 
deploys a custom protocol handler in the sun.net.* tree via 
-Xbootclasspath/p or by patches a java.* or jdk.* module that is mapped 
to the boot loader and the protocol handler doesn't have a public no-arg 
constructor. If they set java.protocol.handlers.pkgs property then it 
uses lookupViaProperty and Class::newInstance as before.

-Alan