RFR: JDK-8025437 - Check DefaultProxySelector for JNI pending exception issues

[Dan Xu]

Hi All,

Please review the fix for the JNI pending exception issue in 
src/solaris/native/sun/net/spi/DefaultProxySelector.c. I have refactored 
the code so that JNI calls will only be run when previous JNI calls 
succeed. Therefore, it is impossible for an unsafe JNI call to happen. 
Please help review it. Thanks!

Bug: https://bugs.openjdk.java.net/browse/JDK-8025437
Webrev: http://cr.openjdk.java.net/~dxu/8025437/webrev.01/ 
<http://cr.openjdk.java.net/%7Edxu/8025437/webrev.00/>

-Dan