the method findTheLongestSubstring() returns int[] pos that contains the start and end index of the of the longest common substring between nodeId and tpId

but in line 221 while adding the NodeIdPair to the treemap, the pos[] is used as folllowing :

          treeMap.put(id, new NodeIdPair(nodeID.substring(0, pos[0] - 1), tpID));

we will solve it and commit the fix.