How to handle exception propagation in webservice client?

Hi ,
Is there a way to catch an exception thrown by Webservice server handler?
We have a situation where we need to handle the exception on the client side thrown by the server handler.
We are using Webspehere webservices created thru RAD 7 and clients are generated using axis 2 code generator tool. We generate WSDL from java class rather than Java from WSDL.
We have vague idea that we can use wsld fault mechanism but does not have much implementation knowledge on it.
Any ideas on this will be great help.
Thanks in advance..

Here is little more detail ::
We have our regular webservices which has some business methods. Also we have a custom handler which extends javax.xml.rpc.handler.GenericHandler to handle requests [public boolean handleRequest(MessageContext context){
return true;
}] for all our application Webservices.
So, in case of any application errors, handler throws an excpetion which we expect it to be caught in the client stub. e.g. if our application throws InvalidDataException with a specific message on it, we expect it to be caught in the client code as InvalidDataException with the original message on it.
Is there a way to achieve this?
Thanks,

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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
i understand that i need to catch this exception in the abap coding but i'm not familiar with oops concepts
can any one please suggest me how to handle this exception for the following code...
method IF_MAPPING~EXECUTE.
break x1149.
* initialize iXML
TYPE-POOLS: ixml.
class cl_ixml definition load.
** Instances & Variable declaration =======================
* instance main factory
TYPES: BEGIN OF t_xml_line,
          data(256) TYPE x,
        END OF t_xml_line.
DATA: l_ixml TYPE REF TO if_ixml,
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* 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'.
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    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] .
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return data;
Can you tell me how to handle NoSuchAlgorithmException ,NoSuchPaddingException,InvalidKeyException and so on

you dont. you're stuffed. If there's 'NoSuchPadding' or NoSuchAlgorithm, or the encryption fails (the other 3), nothing you can do at that point will change that fact.
2 options.
return null, and check the return value every time you call the function
throw an exception, either the exception caught, or one of your own design with information pertinent to your application.

How to handle exceptions

we atarting new project first module.front end java back end oracle.
when we are writing procedures and functions in backend when errors and exceptions are raised we insert that values into error log table which contains all eroor and exception messages.
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 exceptions in a Service

Hi,
I'm trying to get the new Service (background thread) stuff working and am close but I have a problem with handling exceptions that are thrown in my Task. Below is my code, does anyone know if I am doing something wrong, or is this just a flaw in the system at the moment:
Here is my service:
public class TestService extends Service<String>
    protected Task<String> createTask()
        return new Task<String>()
            protected String call() throws Exception
               System.out.println("About to throw exception from inside task");
               throw new Exception("Test failure");
}Here is my code using this service:
public void doTest()
    final TestService test = new TestService();
    test.stateProperty().addListener(new ChangeListener<Worker.State>()
        public void changed(ObservableValue<? extends Worker.State> source, Worker.State oldValue, Worker.State newValue)
            System.out.println("State changed from " + oldValue + " to " + newValue);
    test.start();
}When the task throws its exception I was hoping to get a state change to FAILED but the callback is never triggered. I've tried listening for invalidation of the state and also tried listening to all the other properties on Service (running, progress, exception, etc). There doesn't seem to be any feedback after the exception has been thrown.
Am I using this wrong, or is it a bug?
Cheers for you help,
zonski

Hi,
This was working in the build #32. I updated the JavaFX to build #36 and it stopped working.
I checked in the latest build #37 as well which was released last week and this doesn't work here as well.
If the task is succeeding the state is getting changed to SUCCEEDED but in case of an exception there is no change in the state
Edited by: user12995677 on Aug 3, 2011 2:07 AM

How to handle exception in struts

i am using global exception to pass to a page that shows an error message.
I also want to pass the actual error message to that page is that possible
through the struts config
<global-exceptions>

<exception
key="global.message"
type="java.lang.Exception"
path="Errors.jsp"/>
</global-exceptions>

i am using global exception to pass to a page that shows an error message.
I also want to pass the actual error message to that page is that possible
through the struts config
<global-exceptions>

<exception
key="global.message"
type="java.lang.Exception"
path="Errors.jsp"/>
</global-exceptions>

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.

How to handle exceptions in BAPI

Dear Gurus,
Is there any specific way to handle exceptions in BAPI? I mean the way one handles exception in FM...can tat be applicable to BAPI or is there something specific.
Regards,
Shiku

The export parameter Return can be implemented as follows:
As a structure, whereby it must be defined in the function module as an export parameter, as well as in the method in the BOR.
As a table, whereby it must be defined in the function module as a table parameter, as well as in the method in the BOR as an export parameter.
Before filling the Return parameter you should either initialize the structure with CLEAR or the table with REFRESH and CLEAR.
If the return parameter is not set or is set to an initial value this means that no error has occurred.
The Return parameter may be based on the following reference structures:
BAPIRET2
You must use this reference structure when developing new BAPIS.
BAPIRET1, BAPIRETURN
These reference structures are still partly used in old BAPIs.
Both structures must be filled in the logon language.
Regards,
SuryaD.
Found this info for you shiku at http://help.sap.com/saphelp_46C/helpdata/EN/a5/3ec9f74ac011d1894e0000e829fbbd/content.htm.
Hope this was helpful.

How to handle exception propagation in webservice client?

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