How to handle exceptions / errors in LiveCycle

Hello All ,
I want to handle some exception / errors that may arise while the user is filling the form so that the JavaScript console should not show any error rather we can simply show an alert / message .
Say I got a dynamic table where the user can add / delete row at run time . There is a minimum count for the no.of rows . Suppose the user clicks the delete button without adding a new row then the JavaScript console will show error . I know we can handle this by using if else statements where depending on the instance manager count the deletion of rows are permitted . I want to know is it possible here to write a code to handle exception considering this thing as an exception without using the If-else statement ?? Just a thought.
Thanks.
Bibhu.

What you're looking for is the javascript:
try{
// code
} catch (err) {
// fail code
However, this is not the right way to solve your problem: Exception handling is for handling exceptions, and a scenario that you know can come to pass (such as the user clicking the removeInstance button when there are none to remove) is not an exception.
Don't misunderstand me - putting code inside try/catch is 'good developer manners' (I do it myself all the time), and I strongly encourage you to do the same. Although only for handling exception sprung from code that you think should work just as fine without them.
A better way of solving your particular problem is to remove the minus-button if there are no instances to remove.

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hi experts,
im working on a test scenario for abap mapping in SAP XI im getting this error
An exception with the type CX_SY_REF_IS_INITIAL occurred, but was neither handled locally, nor declared in a RAISING clause Dereferencing of the NULL reference
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method IF_MAPPING~EXECUTE.
break x1149.
* initialize iXML
TYPE-POOLS: ixml.
class cl_ixml definition load.
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* instance main factory
TYPES: BEGIN OF t_xml_line,
 data(256) TYPE x,
 END OF t_xml_line.
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 l_streamfactory TYPE REF TO if_ixml_stream_factory,
* instance input stream
l_istream TYPE REF TO if_ixml_istream,
* instance input document
l_document TYPE REF TO if_ixml_document,
* instance parse input document
l_parser TYPE REF TO if_ixml_parser,
* instance for elements within the nodes
node TYPE REF TO if_ixml_node,
*instance of nodemap
nodemap TYPE REF TO if_ixml_named_node_map,
* instance for iterator
iterator TYPE REF TO if_ixml_node_iterator,
name TYPE string,
value TYPE string,
* instance main factory
 o_ixml TYPE REF TO if_ixml,
* 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
l_element_MT_DEMANDTEC_COST TYPE REF TO if_ixml_element,
*NEXT CHILD ELEMENT FROM THE ABOVE PARENT
l_element_DT_DEMANDTEC TYPE REF TO if_ixml_element,
*CHILDREN1 ELEMENT FOR DT_DEMANDTEC
l_element_DT_WHSE TYPE REF TO if_ixml_element,
*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 =======================================
* 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.
* Build and Fill root node MT_DEMANDTEC_COST
 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( ).
* 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.
* Build and Fill root node MT_DEMANDTEC_COST
 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
errorMsg = o_exception->GET_TEXT( ).
" Display the error information
MESSAGE errorMsg TYPE 'I'.
ENDTRY.
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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but when we run actual application front end people has to know which error is occured in back end .how to handle to display theese errors into front end people

yinghan wrote:
you can add an out parameter to the procedure, output the error message by the out parameter, then JAVA can get the erro message.This is about the worst thing you could do. Better would be not to handle the exception at all.
Also the op might consider googleing for the log4plsql package which does something similiar as the popular log4j routine.
There seems also a beta version available for 10g that uses DBMS_UTILITY.FORMAT_ERROR_BACKTRACE/FORMAT_ERROR_STACK.
Edited by: Sven W. on Oct 22, 2008 2:31 PM
Edited by: Sven W. on Oct 22, 2008 2:31 PM

How to handle Exception in Forms??

Hi,
We have a customer facing application...self-service kinda things actually with self registration, forgot password/ username and edit profile. We are using SIM forms for all of these. Now as per requirement we need to call some web services as backend validation in the forms. we want that if any exception is generated while calling these web services or general exceptions that SIM thrown (like xpress exception etc..) ....the user should redirected to other page containg some custom message because actual exception message is completely useless for user. i tried to use try/catch in jsp and other fundas of exception handling in java but nothing works. If anyone has any suggestion or any prior experience please share. Any pointer will be helpful.
We are using SIM-SPE 7.1 . if someone has experience about exception handling in SPE it will be great otherwise SIM forms exception handling will also work. we can corellate the things in SPE!!!
Thanks in advance!

Bhavna,
create a when-custom-item-event handler on the Forms Bean Container
example:
DECLARE
     eventName varchar2(30) := :system.custom_item_event;
     eventValues ParamList;
     eventValueType number;
     tempString varchar2(100);
BEGIN
IF (eventName=BEAN_ERROR_EVENT') THEN eventValues := get_parameter_list(:system.custom_item_event_parameters);
               get_parameter_attr(eventValues,'ERROR_MESSAGE',eventValueType, tempString);          MsgBox.Show(MsgBox.STOP_ALERT,tempString);
END IF;
END;
This looks for an event named BEAN_ERROR_EVENT and there for a message ERROR_MESSAGE.
In the Bean add the following code:
public static final ID pErrorMessage = ID.registerProperty("ERROR_MESSAGE");
public static final ID eErrorEvent = ID.registerProperty("BEAN_ERROR_EVENT");
private void dispatchErrors(String message)
log(message);
try{
CustomEvent ce = new CustomEvent(m_handler, eErrorEvent);
m_handler.setProperty(pRwAuthMessage,pErrorMessage);
dispatchCustomEvent(ce);
catch (Exception e)
e.printStackTrace();
To handle Bean errors:
try{
catch (Exception e){
dispatchErrors(e.getMessage());
finally {
This know publishes the error message to Forms where you can handle it the way you want.
Fran

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