Finding the end of a document using Scanner

I'm reading a file line by line, but cannot figure out how to read the end of a document without finding the number of lines in the document myself. When I have all of the lines printed out, I get an error at the end saying that no line could be found, which makes sense, since it's the end of the document. But how can I detect the end without getting an error?
Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Unknown Source)
at GustavData.main(GustavData.java:29)

Note: This thread was originally posted in the [Java Programming|http://forums.sun.com/forum.jspa?forumID=31] forum, but moved to this forum for closer topic alignment.

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Order No Item No     Material     Order Qty     Item Category     Plant     Delivery     Billing Document     Sales Org     Dist Channel     Division     Created By     Created On      Changed On
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Moderator message : Requirements dumping not allowed, thread locked.
Edited by: Vinod Kumar on Mar 6, 2012 2:53 PM

i am new to abap...so i dont have idea about sd table relationship.
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REPORT zinaa_sd.
TABLES: vbap, vbak, vbfa.
TYPE-POOLS: slis.
CONSTANTS: c_x TYPE char1 VALUE 'X'.
TYPES:
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         vbeln TYPE vbap-vbeln,
         posnr TYPE vbap-posnr,
         matnr TYPE vbap-matnr,
         pstyv TYPE vbap-pstyv,
         kwmeng TYPE vbap-kwmeng,
         werks TYPE vbap-werks,
        END OF st_vbap,
        BEGIN OF st_vbak,
          vbeln TYPE vbak-vbeln,
          erdat TYPE vbak-erdat,
          ernam TYPE vbak-ernam,
          vkorg TYPE vbak-vkorg,
          vtweg TYPE vbak-vtweg,
          spart TYPE vbak-spart,
          aedat TYPE vbak-aedat,
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         matnr TYPE vbap-matnr,
         pstyv TYPE vbap-pstyv,
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         werks TYPE vbap-werks,
         erdat TYPE vbak-erdat,
         ernam TYPE vbak-ernam,
         vkorg TYPE vbak-vkorg,
         vtweg TYPE vbak-vtweg,
         spart TYPE vbak-spart,
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      lt_vbak TYPE TABLE OF st_vbak,
      ls_vbak TYPE st_vbak,
      lt_final TYPE TABLE OF st_final,
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      ls_fieldcat TYPE slis_fieldcat_alv,
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   ernam
   erdat
   aedat
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   posnr
   matnr
   kwmeng
   pstyv
   werks
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FORM display.
layout-zebra = c_x.
layout-colwidth_optimize = c_x.
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I_INTERFACE_CHECK                 = ' '
I_BYPASSING_BUFFER                = ' '
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IT_EXCLUDING                      =
IT_SPECIAL_GROUPS                 =
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IS_SEL_HIDE                       =
I_DEFAULT                         = C_X
I_SAVE                            = ' '
IS_VARIANT                        =
IT_EVENTS                         =
IT_EVENT_EXIT                     =
IS_PRINT                          =
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I_SCREEN_END_COLUMN               = 0
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