Backport of JSR 166 errors

Dawid Kurzyniec's backport of JSR 166

http://backport-jsr166.sourceforge.net/
Solution coverage:
Summary coverage:

DescriptionException TypeEntry MethodWeb pages

ConcurrentHashMap.get() has thrown a NullPointerException

java.lang.NullPointerException
edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap.get
11Web pages
NullPointerExceptionConcurrentHashMap.get11
Package nameClass namePatterns foundSolution coverageSummary coverage
edu.emory.mathcs.backport.java.util.concurrentThreadPoolExecutor$Worker7
edu.emory.mathcs.backport.java.util.concurrentFutureTask3
edu.emory.mathcs.backport.java.util.concurrentConcurrentHashMap1
edu.emory.mathcs.backport.java.util.concurrentExecutors$RunnableAdapter1
edu.emory.mathcs.backport.java.util.concurrentThreadPoolExecutor1
Package nameClass nameMethod namePatterns foundSolution coverage
edu.emory.mathcs.backport.java.util.concurrentConcurrentHashMapget1
Package nameClass nameMethod nameException TypePatterns foundSolution coverage
edu.emory.mathcs.backport.java.util.concurrentConcurrentHashMapgetNullPointerException1