How to excecute simple select using EntityManager

Hello I am developing a project using Seam, JSF, EJB and JBoss.
All the mappings to the database are correctly done.
However I would like to create a simple select that retrieves the maximum value of the id.
This is how I thought I could do it.
Query q = em.createNativeQuery("select max(id)", Project.class);
But it keeps telling me that column id cannot be found.
Am I writing something wrong?

Ok, this is how I solved it.
Query q = em.createQuery("select max(id) from " + Project.class.getName());
Changed it to createQuery and class.getName

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                    prepare data selection
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                    'R3'                   "message class
                    '008'                  "message number
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                    ' '.                   "message variable 2
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           ON ( kvbeln = ivbeln
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    {Start of insert by SRangaraj on June 29, 2005 >>RD3K915888
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                and n~lvorm eq ' ' )
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        into table int_records1 where ( i~abgru = '  '
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    {Start of insert by SRangaraj on June 29, 2005 >>RD3K915888
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    {Start of insert by SRangaraj on June 29, 2005 >>RD3K915888
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                                     and i~klmeng > 0
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    {Start of insert by SRangaraj on June 29, 2005 >>RD3K915888
                                     and m~labor in l_r_labor ).
    }End of insert by SRangaraj on June 29, 2005 >>RD3K915888
    endif.
        sort int_records1 by vbeln posnr.
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    *remove unnecessary records
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           clear wlf_lmeng.
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           int_records1-vbeln_dl = int_records2-vbeln.
           int_records1-posnr_dl = int_records2-posnn.
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        endloop.
        endif.
        delete int_records1 where klmeng le 0.
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    <--  p2        text
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    *DO INDIVIDUAL MOVES - ITS FASTER THAN MOVE-CORRESPONDING
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              int_records1-PRDHA    to LS_DATA-PRDHA,
              int_records1-matkl    to LS_DATA-MATKL.
        APPEND LS_DATA TO LT_DATA.
        clear: LS_DATA.
        ENDLOOP.
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          OTHERS               = 11.
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          MESSAGE I531(0U) WITH TEXT-005.
          STOP.
        ENDIF.                             " IF SY-SUBRC NE 0
      ELSE.
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        MESSAGE I531(0U) WITH TEXT-004.
        STOP.
      ENDIF.                               " IF SY-SUBRC EQ 0
    ENDFORM.                               " GET_CORP
    *&      Form  F4HELP_CORP
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    FORM F4HELP_CORP .
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      CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
        EXPORTING
          RETFIELD        = 'KUNNR'
          DYNPPROG        = 'Z_EXCESS_USAGE'
          DYNPNR          = '1000'
          DYNPROFIELD     = 'P_CORP'
          VALUE_ORG       = 'S'
        TABLES
          VALUE_TAB       = T_CORP
        EXCEPTIONS
          PARAMETER_ERROR = 1
          NO_VALUES_FOUND = 2
          OTHERS          = 3.
      IF SY-SUBRC EQ 0.
    Do nothing
      ENDIF.                               " IF SY-SUBRC EQ 0
    ENDFORM.                               " F4HELP_CORP

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