EL implicit exception object

Hi
I tried to use the EL implicit exception Object in my errorPage.jsp. The errorPage shows up correctly, but nothing from the exception object is displayed. The page looks something like this:
<%@ page isErrorPage="true" %>
<%@ page isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>General Error</title>
</head>
<body>
...Message: ${exception.message} </div>The output is just "Message:".
I've also tried ${pageContext.exception.message}, which does not work either. How can I access this object with EL?
thanks, Patrick

Actually in JSP2.0 the exception gets exposed via the ErrorData object
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JSPIntro4.html#wp65950
http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/ErrorData.html
${pageContext.errorData.statusCode} is used to retrieve the status code, and ${pageContext.errorData.throwable} retrieves the exception.
Cheers,
evnafets

Similar Messages

Problem accessing exception object in jsp error page - Apache Tomcat 5.0.25

Hi all,
I'm thoroughly confused and need some help. I've deployed a very simple web application in Apache Tomcat 5.0.25 to test exception handling - errortest.jsp and error.jsp. errortest.jsp throws a divide by zero exception if executed with default values in text fields.
When I put the directive IsErrorPage="true" in error.jsp i get a HTTP 500 error when error.jsp is accessed. If I remove it error.jsp is displayed but I cant access the exception object - if I try to I get an exception below:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 5 in the jsp file: /error.jsp
Generated servlet error:
[javac] Compiling 1 source file
E:\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\mywebapp\org\apache\jsp\error_jsp.java:46: cannot resolve symbol
symbol : variable exception
location: class org.apache.jsp.error_jsp
out.print(exception.getMessage());
^
1 error
Below is the code for the two jsp pages:
errortest.jsp:
<%@ page errorPage="error.jsp" %>
<html>
<head><title>Error test</title></head>
<body>
     <form action="errortest.jsp" method="post">
     Enter first number:<input type="text" name="first" value="5"/><br>
     Enter second number:<input type="text" name="second" value="0"/><br>
     <input type="submit"/>
     </form>
     <%
     if (request.getMethod().equals("POST")) {
          int first = Integer.parseInt( request.getParameter( "first" ) );
          int second = Integer.parseInt( request.getParameter( "second" ) );
          int answer = first/second;
     %>
</body>
</html>
NB: I am able to catch and display the exception if I use a try/catch block around the division as shown below.
try {
int answer = first/second;
} catch( Exception e) {
e.printStackTrace( new PrintWriter(out) );
error.jsp (first draft)
NB: HTTP 500 error occurs when directive "isErrorPage" is added:
<%@ page isErrorPage="true" %>
<html>
<head><title>Error Page</title></head>
<body>
</body>
</html>
error.jsp (second draft)
NB: directive is removed but exception thrown when implicit exception object is accessed. error.jsp displays if exception object is not accessed:
<%@ page %>
<html>
<head><title>Error Page</title></head>
<body>
<%=exception.getMessage()%>
</body>
</html>
Web server specs:
Apache Tomcat 5.0.25
Machine specs:
Windows XP Pro
Java environments:
j2sdk1.4.2_03
J2EE 1.4

This works for me:
throwError.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<%@ page language="java" errorPage="/error.jsp"
contentType="text/html; charset=utf-8" %>
<html>
<head>
     <title>Throw Exception</title>
</head>
<body>
Throwing exception....
<%
// throw ArithmeticException
int badInt = 12/0;
%>
</body>
</html>
error.jsp
<%@ page language="java" isErrorPage="true" %>
<head><title>Doh!</title></head>
An Error has occurred in this application.
<% if (exception != null) { %>
<pre><% exception.printStackTrace(new java.io.PrintWriter(out)); %></pre>
<% } else { %>
Please check your log files for further information.
<% } %>

Doubt on try/catch exception object

why it is not advisable to catch type exception in try catch block. Its confusing me. If i catch exception object then it will show whatever exception occured.
btw, i was just go through duke stars how it works and saw this
http://developers.sun.com/forums/top_10.jsp
Congrats!

Because there are many different kinds of Exception. If you have some specific local strategy for dealing with a particular excepion then you should be using a specific catch block.
If you don't then you should allow the expection to end the program, and ideally you should deal with all the expceptions in one top-level handler, so you should throw, rather than catch the exceptions in your methods. Often at the outer most level of the program or thread you will actually catch Throwable (not just Exception) to deal with any unanticipated problems in a general kind of way.
Also, you should be keeping track of what exceptions might be thrown, so that rather than using Exception in a throws clause or catch block, you should use the particular exceptions. Exceptions, generally, indicate a recoverable error that you really ought to be recovering from rather than just printing a stacktrace.
That's why exceptions are treated differently from runtime errors.

Write one Exception Object

Hi to all.
I'm trying to write an Exception object (one own written Exception "MyException")
The real problem is that I don't know what's the way for MyException's object to pass to the exception
process the Trowable object it builds (from message passed by the calling throw statement)
Unfortunatly I don't find any doc about the conventions to write this correctly.
(nor in tutorial, API or elsewhere I searched)
I wrote many versions of such ones but I was never able to obtain that myMessage was returned in catch block by MyException's getMessage() (these inherited from Throwable)
Always, in catch, getMessage() returns "null", also if MyException contains an Throwable-var or String named 'message' .
If MyException's constructor throws a Throwable(myMessage), myMessage is returned but the program does exit.
As counterpart, method(s) implemented in MyException does work as expected.
What I search is a link to some pertinent doc
or a short example
or a little explanation about.
Best thanks.

Here is a simple example to create a custom exception
class MyException extends Exception {
   public MyException(String message) {
           super(message);
   public MyException(Throwable throwable) {
           super(throwable);
   public MyException() {
       super("MyException");
}

Getting error while passing implicit request object from JSP to JavaBean

Hi,
I am getting error while passing implicit object ie( request object)
from within JSP to JavaBean.
Following is source for JSP, JavaBean and Error message I am getting.
vaLookup.jsp Source
<jsp:useBean id="db" class="advisorinsight.javabeans.DisplayPages"
scope="request">
<jsp:setProperty name="db" property="request" value="<%= request %>"
/>
</jsp:useBean>
<jsp:getProperty name="db" property="totalrecords" />
JAVABEAN DisplayPages.java source
package javabeans;
import java.io.Serializable;
import javax.servlet.http.HttpServletRequest;
public final class DisplayPages implements Serializable {
private String totalrecords;
private HttpServletRequest request;
public void setRequest(HttpServletRequest req){
this.request = req;
public java.lang.String getTotalrecords()
this.totalrecords =
this.request.getParameter("totalrecords");
return this.totalrecords;
public DisplayPages(){
totalrecords = "";
request = null;
error after executing vaLookup.jsp
[30/Nov/2001 11:56:04:5] info: EXTMGR-006: GXExtensionManager: Extension
service JavaExtData successfully loaded
[30/Nov/2001 11:56:04:5] info: EXTMGR-006: GXExtensionManager: Extension
service LockManager successfully loaded
[30/Nov/2001 11:56:04:5] info: EXTMGR-006: GXExtensionManager: Extension
service RLOPManager successfully loaded
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:5] info: REQ-012: thread add
[30/Nov/2001 11:56:04:7] info: ENGINE-ready: ready: 10819
[30/Nov/2001 11:56:46:0] info: --------------------------------------
[30/Nov/2001 11:56:46:0] info: JSPRunnerSticky: init
[30/Nov/2001 11:56:46:0] info: --------------------------------------
[30/Nov/2001 11:56:51:7] error: Exception: SERVLET-compile_failed:
Failed in compiling template: /va/valookup.jsp, javac error:
c:\iplanet\ias6\ias\APPS\variabl
S\va\valookup.java:76: Undefined variable: JSP_8
db.setRequest(_JSP__8);
^
1 error
Exception Stack Trace:
java.lang.Exception: javac error:
c:\iplanet\ias6\ias\APPS\variableannuity\va\WEB-INF\compiled_jsp\jsp\APPS\va\valookup.java:76:
Undefined variable: JSP_8
db.setRequest(_JSP__8);
^
1 error
at
com.netscape.server.servlet.jsp.JSPCompiler.compileJSP(Unknown Source)
at
com.netscape.server.servlet.jsp.JSPCompiler.compileOrLoadJSP(Unknown
Source)
at
com.netscape.server.servlet.jsp.JSPCompiler.compileInstance(Unknown
Source)
at
com.netscape.server.servlet.jsp.JSPCompiler.compileInstance(Unknown
Source)
at
com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callJspCompiler(Unknown
Source)
at
com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUri(Unknown
Source)
at
com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUriRestrictOutput(Unknown
Source)
at
com.netscape.server.servlet.platformhttp.PlatformRequestDispatcher.forward(Unknown
Source)
at com.netscape.server.servlet.jsp.JSPRunner.service(Unknown
Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at
com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown
Source)
at
com.netscape.server.servlet.servletrunner.ServletRunner.execute(Unknown
Source)
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at java.lang.Thread.run(Thread.java:479)

The only thing that I see that looks funny to me is when you pass the request object into the method using <%=request%>, Im not sure whats going to happen here because that is suppose to print the results. Have you tried simply using <%request%>?

How to get JCORBA exception object message

Hi I have this problem
say:
I have a JCORBA server and
a method that throws an exception "A"
I build the client program
inside the client program I want to know
if an exception "A" raised how to get the
message inside "A"
I have tried this
ExceptionA extends Exception
ExceptionA() super()
ExceptionA(String msg) super(msg)
In my client program i have
catch(Exception A)
System.out.println(A.getMessage());
but this method does not seem to work
because it will return java.lang.methodnotfoundexception
it seems to complain that ExceptionA(String )
not found
thanks for your help
null

Hi,
BAPIs that can create, change or delete instances of a business object type
The following BAPIs of the same object type have to be programmed so that they can be called several times within one transaction. For example, if, after sales order 1 has been created, a second sales order 2 is created in the same transaction, the second BAPI call must not affect the consistency of the sales order 2. After completing the transaction with a COMMIT WORK, both the orders are saved consistently in the database.
Create( ) and CreateFromData( )
The BAPIs Create() and CreateFromData() create an instance of an SAP business object type, for example, a purchase order. These BAPIs are class methods.
Change( )
The BAPI Change() changes an existing instance of an SAP business object type, for example, a purchase order. The BAPI Change () is an instance method.
Delete( ) and Undelete( )
The BAPI Delete() deletes an instance of an SAP business object type from the database or sets a deletion flag.
The BAPI Undelete() removes a deletion flag. These BAPIs are instance methods.
Cancel ( )
Unlike the BAPI Delete(), the BAPI Cancel() cancels an instance of a business object type. The instance to be cancelled remains in the database and an additional instance is created and this is the one that is actually canceled. The Cancel() BAPI is an instance method.
Add<subobject> ( ) and Remove<subobject> ( )
The BAPI Add<subobject> adds a subobject to an existing object instance and the BAPI and Remove<subobject> removes a subobject from an object instance. These BAPIs are instance methods.
Reward if helpful.
Regards,
Harini.S

Handling Exceptions in Custom Tags??

Hi,
          what is the preferred way to handle an exception that is thrown from jsp
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          pointer exception inside of the custom tag. When the code executes, a
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          <golf:golfPage navRoot="admin_overview" title="Admin Overview" >
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          <%
          Hashtable ht = null;
          ht.put("test","test null pointer");
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Never mind... got the answer to my question:
http://www.ajug.org/archive/ajug-members/10306/msg00030.html
The encode methods are executed in the JSP which is why the implicit exception object is available... while the decode methods are executed as part of the Faces Servlet lifecycle and hence the exception object must be gotten from the request attribute...
I guess I need to take Servlet 101 all over again...

Methods of expection object

Where can I find a list of methods of the implicit "exception" object?
Thanks

If you mean the "exception" scripting variable available in a JSP error page then, according to the JSP spec, it refers to an instance of java.lang.Throwable which is also documented in the API.

Forwarding credentials from j_security_check to EJB

I'm using the FORM based authentication on my web app to log in users...
I've defined roles on both web app and ejb jar files... The problem that I'm
facing is that the Principal is not being forwarded to the EJB Container to
validate authorization...
Should this mechanism me transparent? Or do I have to provide the user's
credential when creating my InitialContext? I hope I'm not too lost on this
one...
BTY, I'm using WLS6.1, the EJB is a very simple stateless bean and using the
default Realm. Also, I'm not using EAR files and the EJB is NOT a ejb-ref on
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Marcelo.

          Hi Aleksey,
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          Regards,
          Tom Hegadorn
          Developer Relations Engineer
          BEA Support
          Aleksey Matiychenko <[email protected]> wrote:
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          >is thrown in j_security_check. Then I still get redirected to the error
          >page by my exception object is null.
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JSP error page in web.xml

I had a JSP error page spcified through the attribute isErrorPage and referenced in the other JSPs through the errorPage attribute, and everything worked well.
Then, I decided to specify that errorpage in the web.xml instead :
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/error.jsp<location>
</error-page>The page is found and everythiing, except that I don't get the Throwable info in the implicit exception object in error.jsp. There's nothing in exception.getMessage().
Anybody knows why and the solution to this ?

The JSP spec lets you get the Throwable through the javax.servlet.jsp.jspException request attribute.
The servlet spec uses the javax.servlet.error.exception request attribute for the same thing.
Therefore, because of the above unfortunate mismatch, when you switched to a global error page, you could no longer get the Throwable through the implicit exception obj, because the later retrieves Throwable from the javax.servlet.jsp.jspException request attribute.
The solution would be to retrieve javax.servlet.error.exception from the request yourself in your error page.

ABAP Object Exception handling

Hi all,
I would very much like some links to learn how to create Exception objects, and how to use them in my ABAP Object apps.
Thanks in advance!

hi,
Object Services classes work exclusively with Class-Based Exceptions. The exception classes are predefined in the system. They always start with CX_OS_.
Exceptions of the CX_DYNAMIC_CHECK category are passed to the caller using the RAISING clauses of interface methods; class-specific methods of the class actor; attribute access methods of persistent classes; in the transaction object; and the system actors. Such exceptions must be handled here by the user, (in contrast to the general rule that exceptions should be handled within a procedure, not passed along the hierarchy). Thus semantically, the above exceptions of the CX_DYNAMIC_CHECK category belong more to the CX_STATIC_CHECK category. However, they could not be defined as such, due to their incompatibility with existing Object Services applications.
Check out the link.
http://help.sap.com/saphelp_erp2005vp/helpdata/en/66/bc7aec43c211d182b30000e829fbfe/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/fb/35c62bc12711d4b2e80050dadfb92b/content.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/17/f9f44295bae2499e8c56ca4f5106fb/frameset.htm
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Richa.

_jspService exception handling

Below is the generated source for a jsp I have written. Assuming an exception is raised in the try block as depicted below how does an error-page defined in the web.xml ever get control?
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public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException {
try {
<---- assume exception thrown here
catch( Throwable e) {
try {
if (out != null) out.clear();
catch( Exception clearException) {
pageContext.handlePageException( e);
finally {
OracleJspRuntime.extraHandlePCFinally(pageContext,true);
JspFactory.getDefaultFactory().releasePageContext(pageContext);
}

In the JSP which generates an error add a page directive.
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How to handle exception CX_SY_REF_IS_INITIAL

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,
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   l_streamfactory TYPE REF TO if_ixml_stream_factory,
* instance input stream
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l_document TYPE REF TO if_ixml_document,
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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,
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   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.
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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( ).
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l_istream = l_streamfactory->create_istream_xstring( source ).
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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 ).
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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.
      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.
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IF l_parser->is_dom_generating( ) EQ 'X'.
    refresh : it_source.
    node ?= l_document.
    CHECK NOT node IS INITIAL.
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    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 ).
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* 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

Object reference not set to an instance of an object in live connection

Each metod for LiveAuthClient drop exception: "Object reference not set to an instance of an object.". I think this is due to the fact that session in LiveAuthClient is null, but i not sure why. I'm not registered in Windows
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If you are writing a Windows Store application, please follow the directions listed for Windows Store apps here:
http://msdn.microsoft.com/en-us/library/live/hh826551.aspx

Problem with Dynamically accessing EJB Class objects in WL 7.0 SP1

I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
as I can see it in the console, I also seen to have been able to get the remote
interface of the object, my problem occurs when I try and access the class object
so I can perform a create on the object and then execute my method
The code I have written is below:
private Object getRemoteObject(Context pCtx, String pJNDIName, String pHomeBean)
throws Exception {
     String homeCreate = "create";
     Class []homeCreateParam = { };
     Object []homeCreateParamValues = {};
try {
//This call seems to work and doesn't throw an exception
Object home = pCtx.lookup(pJNDIName);
//However this call throws a java.lang.ClassNotFoundException
Class homeBean = Class.forName(pHomeBean);
Method homeCreateMethod = homeBean.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
} catch (NamingException ne) {
logStandardErrorMessage("The client was unable to lookup the EJBHome.
Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
name "+pJNDIName+" on the WebLogic server ");
throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
throw e;
Any advice would be really appreciated, I'm fast running out of ideas, I suspect
it has something to do with the class loader but I'm not sure how to resolve it
Regards
Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

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