How to retrive data from this inernal table

hi,
could u please explain clearly how to retrive the records from this structure
data: begin of itab.
include structure sflite.
data:end of itab.
how to retrive data from this structure could u plz give me a code with example.

Hi,
TYPES: BEGIN OF struc1,
                val1 TYPE c,
                val2 TYPE c,
             END OF struc1,
         BEGIN OF struc2,
               val type struc1,
               val3 TYPE c,
               val4 TYPE c,
            END OF struc2.
DATA: l_f_str1 type struc1,
      l_f_str2 type struc2.
START-OF-SELECTION.
l_f_str2-val-val2 = 'a'.
write : / l_f_str2-val-val2.
END-OF-SELECTION.

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55     cs2.setDataFormat(HSSFDataFormat.getBuiltinFormat("text"));
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66     }
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68     out.close();
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70     //Read the file that was created.
71
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74     fin.read(b,0,b.length);
75     fin.close();
76
77     wdContext.currentContextElement().setDataContent(b);
78     }
79     catch(Exception e)
80     {
81     wdComponentAPI.getComponent().getMessageManager().reportException("Exception while reading file "+e,true);
82     }
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84     }
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After test the code lines appears this error stacktrace:
[code]
java.lang.NoClassDefFoundError: org/apache/poi/hssf/usermodel/HSSFWorkbook
     at com.sap.tc.webdynpro.progmodel.api.iwdcustomevent.ExportToExcel.onActionAct1(ExportToExcel.java:232)
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     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
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Tokio Franco Chang
[/code]

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Cheers
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How to retrive data from this inernal table

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