Hi all,

Our tool has found one kind of potential NPE bugs caused by returning null in method tokenizeToStringArray.

There are several points that use the null value, including:

1. assigned to variable pathParts in method extractPathWithinPattern and used it by pathParts.length in method extractPathWithinPattern

2. assigned to variable patternParts in method extractPathWithinPattern and used it by pathParts.length in method extractPathWithinPattern

3. the null value is returned by method tokenizePath. There are still several points that use this null value, including:
   3.1. assigned to variable pathDirs in method doMatch and used it by pathDirs.length - 1 in method doMatch
   3.2. assigned to variable tokenized in method tokenizePattern and assigned to variable pattDirs by String[] pattDirs = tokenizePattern(pattern); in method doMatch. Finally, it is used by pattDirs.length - 1;

Thanks.