[OpenJDK 2D-Dev] [9] RFR JDK-6591280: getting IPP connection causes disabling jar caches

[Prasanta Sadhukhan]

Hi All,

Please review a fix for jdk9 where it is seen that we are unnecessarily 
disabling jar caching for entire JVM execution
when a IPPConnection is established, which is wrong.

Bug: https://bugs.openjdk.java.net/browse/JDK-6591280
webrev: http://cr.openjdk.java.net/~psadhukhan/6591280/webrev.00/

When IPPService.getIPPConnection(URL url) is called, we call 
connection.setDefaultUsesCaches(false) [in addition to 
connection.setUseCaches(false);]
where "connection" is instance of HttpUrlConnection.
Calling this setDefaultUsesCaches(false) will result in disabling 
|URLConnection|'s |useCaches| flag and as spec states "This flag applies 
to the next, and all following URLConnections that are created"
so jar caching will be disabled for subsequent URLConnections too.

Proposed fix is to remove this setting of disabling jvm-wide jar caching.

Regards
Prasanta

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