How to handle Exception on Server Side as well as Client side

Hello All,
what is the method of EXCEPTION HANDLING in  Web Dynpro Java ? I have no idea how these exception throw.
Thks in advance.

Hi,
Exception handling in WDJav ais similar to that of Java.
exception handling in webdynpro
Regards,
SrinivaS

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      TYPES: BEGIN OF t_xml_line,
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            END OF t_xml_line.
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      l_document TYPE REF TO if_ixml_document,
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      value     TYPE string,
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    * instance output document
       o_document TYPE REF TO if_ixml_document,
    * instance output stream
      o_istream  TYPE REF TO if_ixml_ostream,
    * instance parse output document
      o_parser  TYPE REF TO if_ixml_parser,
    * instance fot renderer
      renderer type ref to if_ixml_renderer,
      irc type i,
      l_xml_size   TYPE i,
    *ROOT ELEMENT
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    *CHILDREN2 ELEMENT FOR DT_DEMANDTEC
    l_element_DT_DC    TYPE REF TO if_ixml_element,
    *CHILDREN3 ELEMENT FOR DT_DEMANDTEC
    l_element_DT_PLANT    TYPE REF TO if_ixml_element,
    *CHILDREN4 ELEMENT FOR DT_DEMANDTEC
    l_element_DT_QTY    TYPE REF TO if_ixml_element.
    *saving the xml document
      DATA: l_xml_table       TYPE TABLE OF t_xml_line.
      types: begin of t_source,
              whse(5),
              dc(4) ,
              plant(4),
              qty    type i,
             end of t_source.
      types: tt_source TYPE STANDARD TABLE OF t_source.
      data:  wa_source type t_source.
      data: it_source TYPE  tt_source,
            ivalue type string.
    * Procedures and business logic =======================================
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      l_ixml = cl_ixml=>create( ).
    *   Creating a stream factory
      l_streamfactory = l_ixml->create_stream_factory( ).
    * create input stream
      l_istream = l_streamfactory->create_istream_xstring( source ).
    *  initialize input document
      l_document = l_ixml->create_document( ).
    *  Create a Parser
      l_parser = l_ixml->create_parser( stream_factory = l_streamfactory
                                          istream        = l_istream
                                          document       = l_document ).
    * parse input document
      l_parser->parse( ).
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      l_parser->set_validating( mode = if_ixml_parser=>co_validate ).
    *   Parse the stream
      IF l_parser->parse( ) NE 0.
        IF l_parser->num_errors( ) NE 0.
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                str        TYPE string,
                i          TYPE i,
                count      TYPE i,
                index      TYPE i.
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          index = 0.
          WHILE index < count.
            parseerror = l_parser->get_error( index = index ).
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            WRITE: 'line: ', i.
            i = parseerror->get_column( ).
            WRITE: 'column: ', i.
            str = parseerror->get_reason( ).
            WRITE: str.
            index = index + 1.
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        node ?= l_document.
        CHECK NOT node IS INITIAL.
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        iterator  = node->create_iterator( ).
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    *   loop over all nodes
        WHILE NOT node IS INITIAL.
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              nodemap = node->get_attributes( ).
            WHEN if_ixml_node=>co_node_text.
    *         text node
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                wa_source-DC = value.
              ELSEIF name eq 'DT_PLANT'.
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              ELSEIF name eq 'DT_QTY'.
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        endwhile.
      ENDIF.
      loop at it_source into wa_source .
        at first.
    *       Creating a ixml factory
          o_ixml = cl_ixml=>create( ).
    *       Creating the dom object model
          o_document = l_ixml->create_document( ).
        endat.
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          l_element_MT_DEMANDTEC_COST    =
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                                  name   = 'MT_DEMANDTEC_COST'
                                  parent = o_document ).
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    *                                                  MT_DEMANDTEC_COST
        l_element_DT_DEMANDTEC    = O_document->create_simple_element(
                                     name   = 'DT_DEMANDTEC'
                                     parent = l_element_MT_DEMANDTEC_COST ).
    *      Build and Fill  Child node1 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-WHSE.
        l_element_DT_WHSE    = O_document->create_simple_element(
                                         name   = 'DT_WHSE'
                                         VALUE  = ivalue
                                         parent = l_element_DT_DEMANDTEC  ).
    *      Build and Fill  Child node2 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-DC.
        l_element_DT_DC   = O_document->create_simple_element(
                                             name   = 'DT_DC'
                                              VALUE  = ivalue
                                    parent = l_element_DT_DEMANDTEC ).
    *      Build and Fill  Child node3 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-PLANT.
        l_element_DT_PLANT   = O_document->create_simple_element(
                                                 name   = 'DT_PLANT'
                                                  VALUE  = ivalue
                                   parent = l_element_DT_DEMANDTEC  ).
    *      Build and Fill  Child node4 DT_QTY for parent DT_DEMANDTEC
        ivalue              = wa_source-QTY.
        l_element_DT_QTY     = O_document->create_simple_element(
                                                 name   = 'DT_QTY'
                                                  VALUE  = ivalue
                                   parent = l_element_DT_DEMANDTEC  ).
      endloop.
    * render document ======================================================
    * create output stream
      o_istream  = l_streamfactory->create_ostream_xstring( result ).
    *   Connect internal XML table to stream factory
      o_istream  = l_streamfactory->create_ostream_itable( table =
    l_xml_table ).
      renderer = o_ixml->create_renderer( ostream = o_istream
                                              document = o_document ).
      irc = renderer->render( ).
    * how do i catch the exception for type CX_SY_REF_IS_INITIAL ...?
    endmethod.
    full reward points for answers.
    Thanks & Regards,
    Uday Kumar.
    Edited by: UDAY on May 6, 2008 9:32 PM

    Hi Uday,
    Its occurs because you're trying to access a objects with null reference. Or you forgot to create an instance or an error occurs during the instance creation. So You should put all your "Procedures and business logic" inside a Try/catch block. as follow.
    " Define a class exception object to get error message......
    DATA o_exception TYPE REF TO cx_sy_ref_is_initial.
    "// Use the statment Try block to catch the error.
    TRY.
    *   Creating the main iXML factory
      l_ixml = cl_ixml=>create( ).
    *   Creating a stream factory
      l_streamfactory = l_ixml->create_stream_factory( ).
    * create input stream
      l_istream = l_streamfactory->create_istream_xstring( source ).
    *  initialize input document
      l_document = l_ixml->create_document( ).
    *  Create a Parser
      l_parser = l_ixml->create_parser( stream_factory = l_streamfactory
                                          istream        = l_istream
                                          document       = l_document ).
    * parse input document
      l_parser->parse( ).
    *   Validate a document
      l_parser->set_validating( mode = if_ixml_parser=>co_validate ).
    *   Parse the stream
      IF l_parser->parse( ) NE 0.
        IF l_parser->num_errors( ) NE 0.
          DATA: parseerror TYPE REF TO if_ixml_parse_error,
                str        TYPE string,
                i          TYPE i,
                count      TYPE i,
                index      TYPE i.
          count = l_parser->num_errors( ).
          WRITE: count, ' parse errors have occured:'.
          index = 0.
          WHILE index < count.
            parseerror = l_parser->get_error( index = index ).
            i = parseerror->get_line( ).
            WRITE: 'line: ', i.
            i = parseerror->get_column( ).
            WRITE: 'column: ', i.
            str = parseerror->get_reason( ).
            WRITE: str.
            index = index + 1.
          ENDWHILE.
        ENDIF.
      ENDIF.
    *   Process the document
      IF l_parser->is_dom_generating( ) EQ 'X'.
        refresh : it_source.
        node ?= l_document.
        CHECK NOT node IS INITIAL.
    *   create a node iterator
        iterator  = node->create_iterator( ).
    *   get current node
        node = iterator->get_next( ).
    *   loop over all nodes
        WHILE NOT node IS INITIAL.
          CASE node->get_type( ).
            WHEN if_ixml_node=>co_node_element.
    *         element node
              name    = node->get_name( ).
              nodemap = node->get_attributes( ).
            WHEN if_ixml_node=>co_node_text.
    *         text node
              value  = node->get_value( ).
              if name eq 'DT_WHSE'.
                wa_source-whse = value.
              ELSEIF name eq 'DT_DC'.
                wa_source-DC = value.
              ELSEIF name eq 'DT_PLANT'.
                wa_source-PLANT = value.
              ELSEIF name eq 'DT_QTY'.
                wa_source-QTY = value.
                COLLECT wa_source INto it_source.
                CLEAR   wa_source.
              ENDIF.
          endcase.
          node = iterator->get_next( ).
        endwhile.
      ENDIF.
      loop at it_source into wa_source .
        at first.
    *       Creating a ixml factory
          o_ixml = cl_ixml=>create( ).
    *       Creating the dom object model
          o_document = l_ixml->create_document( ).
        endat.
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        AT FIRST.
          l_element_MT_DEMANDTEC_COST    =
    O_document->create_simple_element(
                                  name   = 'MT_DEMANDTEC_COST'
                                  parent = o_document ).
        ENDAT.
    *      Build and Fill  Child node DT_DEMANDTEC for parent
    *                                                  MT_DEMANDTEC_COST
        l_element_DT_DEMANDTEC    = O_document->create_simple_element(
                                     name   = 'DT_DEMANDTEC'
                                     parent = l_element_MT_DEMANDTEC_COST ).
    *      Build and Fill  Child node1 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-WHSE.
        l_element_DT_WHSE    = O_document->create_simple_element(
                                         name   = 'DT_WHSE'
                                         VALUE  = ivalue
                                         parent = l_element_DT_DEMANDTEC  ).
    *      Build and Fill  Child node2 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-DC.
        l_element_DT_DC   = O_document->create_simple_element(
                                             name   = 'DT_DC'
                                              VALUE  = ivalue
                                    parent = l_element_DT_DEMANDTEC ).
    *      Build and Fill  Child node3 DT_WHSE for parent DT_DEMANDTEC
        ivalue              = wa_source-PLANT.
        l_element_DT_PLANT   = O_document->create_simple_element(
                                                 name   = 'DT_PLANT'
                                                  VALUE  = ivalue
                                   parent = l_element_DT_DEMANDTEC  ).
    *      Build and Fill  Child node4 DT_QTY for parent DT_DEMANDTEC
        ivalue              = wa_source-QTY.
        l_element_DT_QTY     = O_document->create_simple_element(
                                                 name   = 'DT_QTY'
                                                  VALUE  = ivalue
                                   parent = l_element_DT_DEMANDTEC  ).
      endloop.
    * render document ======================================================
    * create output stream
      o_istream  = l_streamfactory->create_ostream_xstring( result ).
    *   Connect internal XML table to stream factory
      o_istream  = l_streamfactory->create_ostream_itable( table =
    l_xml_table ).
      renderer = o_ixml->create_renderer( ostream = o_istream
                                              document = o_document ).
      irc = renderer->render( ).
    "   The Statement CATCH define a block that catches the exceptions of the
    "   exception class cx_sy_ref_is_initial
        CATCH cx_sy_ref_is_initial INTO o_exception.
    " If you need to get the error message text do as follow
    DATA errorMsg type string.
    " Get the message text
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    " Display the error information
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    The TRY block defines a guarded area whose class-based exceptions can be caught in the subsequent CATCH blocks. If no exception occurs in the TRY block and it reaches its end, the system continues the processing after ENDTRY. If a class-based exception occurs in the TRY block, the system searches for an exception handler in the same or an external TRY control structure.
    Font: SAP Help
    You can see a how to create and use an exception in this example [ ABAP Objects - Defining a Class-based exceptions|https://wiki.sdn.sap.com/wiki/x/19w] .
    Best Regards.
    Marcelo Ramos

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