RFR (JDK11/JAXP/java.xml) 8198548: Initialization race in com.sun.org.apache.xerces.internal.impl.xpath.regex.Token.getRange() on Token.categories

[Joe Wang]

Hi,

Please review a fix on synchronization. The real change is the 
double-checked locking, all others are s/Token.categories/tmpMap/g.

All JAXP tests passed. Before the fix, the test attached to JBS failed 
only once for me after 10,000 runs and then a few 1000 runs (impossible 
to get one with only 20 runs as the comment mentioned).  The author of 
the original report put the actual pass rate at 99.994%. After the fix 
then, in theory it should be 100%, I've made a 100,000 run without 
seeing a failure.

JBS: https://bugs.openjdk.java.net/browse/JDK-8198548
webrevs: http://cr.openjdk.java.net/~joehw/jdk11/8198548/webrev/

Thanks,
Joe