java - An "Empty" Character Extracted from a PDF -

I recently tried to use PDF to extract text from a PDF file. This works well for most PDFs, but for a PDF (which is unfortunately not allowed to share me), all the periods of sentences are not taken out. Instead, I get phrases like the following:

  ... what will this happen ... it will be important later ...   
 It seems that this is just a place rather than a space, but it is not (at least on Mac OS X) if you copy the text into a text editor and begin to move the text cursor through the phrase , Then there is a "blank letter" immediately after "T" in "foot" To various:  
 
 Keep preceding cursor "feet" in the letter "T" and press the right arrow key. The cursor moves one step to the right.  
 Press the right arrow key again, you are right where you are.  
 Press the right arrow key one more time, you can see the other side of the space.  
 Exits as expected to continue by pressing the right arrow key   
 It appears that the PDF box has some kind of "blank character" Removed period I have tried to change it in a few different ways, but I have not found any luck:  
  string old text = text; Text = text.replace ('\ u0000', '.'); // Unicode tap text = text Location ('' 0 ','. '); // C System System.out.println (oldText.equals (text)); // Returns True // Also tried the text Location (zero, '.'), But it does not compile   
 What is this "empty character" and how can I change it?  
 Edit: It has been suggested that the character can be a letter like  \ uFEFF , but it is not suggested to try to replace it with a rijks < / P>  
 
 
 After feeling that the character  \ uFEFF  or  \ u0000 , two values ​​of Unicode which used to run other stack overflow users, I decided to run a test to decide what the code was really about. Using the code to determine what the Unicode value is, I discovered that the mysterious character was  \ u008 , which is "". Why was I not known from PDF, I did not know, but  text = text.replace ('\ u0008', '.')  now it changes with missing time.