* java/lang/natClass.cc (getSignature): Don't try to dereference
param_types if it is null. Instead, take this to mean "no parameters".
* java/lang/TreeMap.java (TreeIterator.next): Throw
NoSuchElementException in preference to
ConcurrentModificationException.
(TreeIterator.remove): Throw IllegalStateException in preference to
ConcurrentModificationException.
(SubMap.firstKey): Do a better check for empty SubMap, and if it is,
throw a NoSuchElementException.
(SubMap.lastKey): Likewise.
From-SVN: r39658
