RFR (JAXP) 8151154: IllegalArgumentException not thrown when wrong syntax value is set for javax.xml.catalog.files

[huizhe wang]

Hi,

The issue was that the CatalogFeatures builder did not conduct any 
verification on inputs. The file path verification was done in the 
CatalogImpl before parsing started. This change added that to where the 
property was set in the builder, thus some refactoring (moving the 
verification methods to Util) was involved.

Please review:
JBS: https://bugs.openjdk.java.net/browse/JDK-8151154
Webrev: http://cr.openjdk.java.net/~joehw/jdk9/8151154/

Thanks,
Joe