new URL(string) suffers under concurrency

Under moderate concurrency (25threads) and frequent use of new java.net.URL(string) a bottleneck was seen with yourkit. In one test involving HTML page generation new URL(url) was seen to take 20% of time (via yourkit).

This was tracked to org.apache.felix.framework.URLHandlers.getFrameworkFromContext() URLHandlers.java which accounted for 99% of the time used by new URL(url).