Handling exceptions inside a Presentation

Hi people, I have a problem handling exceptions inside a Presentation that it is inside an screenflow (that it is inside a Global Creation Activity). This it is in some way related to this other thread: Managing transactions with DynamicSQL
I have an Interactive Activity that renders an Object BPM's Presentation. This Presentation has dependent combos (i.e.: Country, State, City).
Although I can add an exception transition to the Interactive Activity, if the BP-Method that fills the other combo fails, this exception transition it is not executed. Instead, it shows a screen with the stack trace.
The solution I've found: catch the exception inside the BP-Method, and use this.showError let the user know that something went wrong.
This solves my problem, but I'd like to know why ALBPM let me put an exception transition from an Interactive Activity? I mean, in which cases this transition could be executed
Thanks in advance!

This does not solve my problem, but I think that it would be a better design idea not to allow presentations to call server-side BP-Methods directly. Instead it should call a client-side BP-Method and from this method call the one in the server.
This should improve the way we can handle an error that occurs on a server-side BP-Method
It's for sure a "best practice", but I think it would be better if the tool help us to implemented this way
What do you think?

Similar Messages

How to handle exception inside a portlet

I noticed that inside a portlet if a exception been thrown, no matter what exception
it was, it will eventually become a javx.servlet.servletException.
Problem is: <portlet:getException> does not seem to be able to display the specific
exception message. it just displays the generic "Functionality currently not
available". Although in the server console, the perticular exception message shows
up.
In the EBCC, I generated a wildcard javax.servlet.servletException and points
to a portlet, it still not working.
Anybody had experience about exception handling inside a portlet and display it
out?
Appreciate your help!

Just throw the exception and map an error page in the web.xml.
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>error.jsp</location>
</error-page>

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

Use catch block to do something other than handling exception?

Hello,
I have always been under the impression that the catch block should only handle the exception thrown by the try block?
But now I'm reading a class where it's more or less used as an else if. Of course this works well, but I don't like it.
What is your view of this? A little example:
FileReader fR = null;
try{
      fR = new FileReader("file1")
catch (Exception e){
     //If file1 didn't exist try if file2 exists
     try{
         fR = new FileReader("file2")
     catch (Exception ee){
}I think it should be rewritten not using this technique?

Farmor wrote:
Hello,
I have always been under the impression that the catch block should only handle the exception thrown by the try block?
But now I'm reading a class where it's more or less used as an else if. Of course this works well, but I don't like it.
What is your view of this? A little example:
FileReader fR = null;
try{
fR = new FileReader("file1")
catch (Exception e){
//If file1 didn't exist try if file2 exists
try{
fR = new FileReader("file2")
catch (Exception ee){
}I think it should be rewritten not using this technique?There's nothing really wrong with the code you posted, but I find it ugly to write additional non-error-handling code inside nested try-catches. What happens if you want to extend this logic to 3 or 4 files? If the code could be written to avoid it, as someone else showed, I'd prefer the other way.
I'd put the file names in an array, and loop over the array until I found one I could open.

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.

Handling Exceptions in Custom Tags??

Hi,
          what is the preferred way to handle an exception that is thrown from jsp
          code in the body of a custom tag? The code below obviously causes a null
          pointer exception inside of the custom tag. When the code executes, a
          ServletException ( javax.servlet.ServletException: runtime failure in custom
          tag 'golfPage' ) is thrown back. Is there any way to structure code so that
          you get a better idea of what actually went wrong in the body of the custom
          tag?
          <golf:golfPage navRoot="admin_overview" title="Admin Overview" >
          <br>
          <%
          Hashtable ht = null;
          ht.put("test","test null pointer");
          %>
          </golf:golfPage>


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...

Invalid Handle Exception-What is the reason?

I face with "Invalid Handle exception" (SQLException) while using the following code.
Could anybody tell me the possible reasons/Situation the error rise?
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(SQLStmt);
     if(rs!=null){
ResultSetMetaData rsm = rs.getMetaData();
     int totalcols = rsm.getColumnCount();
     Vector temp;
     while (rs.next()) {
     Vector temp = new Vector();
     for (int i = 1; i <= totalcols; i++) {
          String value = rs.getString(i);
          if (value == null) {
          value = "";
     temp.addElement(value);
     }//for loop ends here
     valueVector.addElement(temp);
     rs.close();
     stmt.close();
Thank you all

Vector temp;
while (rs.next()) {
Vector temp = new Vector();Are you sure that this is the code you are running? The reason I ask is that I'm pretty sure that it won't compile, at least under JDK1.4. You should get a compile error something like "temp is already defined".
If thats not the problem you need to find out on which line the error actually occurs. You can get this from the exception by calling the printStackTrace() method.
Col

Can we handle exceptions for the expressions in select query?

Hi all,
Can we handle exceptions for the expressions in select query.
I created a view, there I am extracting a substring from a character data and expected that as a number.
For example consider the following query.
SQL> select to_number( substr('r01',2,2) ) from dual;
TO_NUMBER(SUBSTR('R01',2,2))
1
Here we got the value as "1".
Consider the following query.
SQL> select to_number( substr('rr1',2,2) ) from dual;
select to_number( substr('rr1',2,2) ) from dual
ORA-01722: invalid number
For this I got error. Because the substr returns "r1" which is expected to be as number. So it returns "Invalid number".
So, without using procedures or functions can we handle these type of exceptions?
I am using Oracle 10 G.
Thanks in advance.
Thank you,
Regards,
Gowtham Sen.

SQL> select decode(ltrim(rtrim(translate(substr('r21', 2, 2), '0123456789', ' ' ), ' '), ' '), null, (substr('r21', 2, 2)), null) from dual;
DE
21
SQL> ed a
SQL> select decode(ltrim(rtrim(translate(substr('rr1', 2, 2), '0123456789', ' ' ), ' '), ' '), null, (substr('rr1', 2, 2)), null) from dual;
D
-

How to handle exceptions of rfc in web dydnpro

hi all,
i want to handle exceptions of Remote function module in webdynpro.how can we do that one.are there any variables in model class for those exceptions.
regards
Naidu

Hi,
Hope the following snippet answers ur query
IWDMessageManager manager = wdComponentAPI.getMessageManager();
               try{
                    wdContext.currentB_Quotation_Createfromdata_InpElement().modelObject().execute();
                    wdContext.nodeOutputQuotation().invalidate();
               } catch(WDDynamicRFCExecuteException ce) {
                    manager.reportException(ce.getMessage(), false);

Handling exception logging in a Java task scheduler program?

I need to design a Task Scheduler Where
1) User should be able to schedule multiple task at the same time.
2) There should be proper error handling on failure of any task and should not affect the other running tasks.
I found the related programme at http://www.roseindia.net/java/example/java/util/CertainAndRepeatTime.shtml
My concern is about handling of point 2 in program provided at above link. Say I schedule a recurring mail send process in above program which will be run first time on 12 september 2011 at 2 am, and will be repeated after every 2 hours Say a one process fais at 8 am. I want to log it in log file with task name and time details. Now if I look at above programme i.e CertainAndRepeatTime.java. This program will exit once it schedules all the tasks. Where and how should handle the logging?
Posted at http://stackoverflow.com/questions/7377204/handling-exception-logging-in-a-java-task-scheduler-program but folks suggesting Quartz scheduler . My Limitation is that i can't for quartz because my project allows me to use only standard java library. Is there any way we can handle logging in the same programme in case of exception.

Well, first of all I wouldn't trust any code from roseindia. So you might want to look for more reliable advice.
As for your logging, you can add it for example to the TimerTask itself. I don't recommend adding logging to that roseindia cr*p though.

How can I handle exception? - to give user more friendly notification

Hi!
User gets an error:
'Error in mru internal routine: ORA-20001: Error in MRU: row= 1, ORA-20001: ORA-20001: Current version of data in database has changed since user initiated update process. current checksum =...'
How can I handle this exception (when two users want to modify the same set of data at the same time)? I would like to hide the above error message and give user more friendly notification.
Thanks in advance,
Tom

Thanks Vikas for your answer.
These workarounds are really creative and I want to use one of them. BUT my problem is to 'catch' the exception/error when two users want to modify the same set of data at the same time.
Those solutions which we can read about in this link you gave me describe handling exceptions in pl/sql processes. How can I catch the error I am talking about in pl/sql code?
Code would be like this:
DECLARE
two_users EXCEPTION;
BEGIN
IF --catch the error
THEN RAISE two_users;
END IF;
EXCEPTION WHEN two_users
THEN :HIDDEN_ITEM := 'Error Message';
END;
What should I put in a place where there is '--catch the error' ??
Thanks in advance,
Tom

To handle exception in insert query

Hi ,
I am trying it insert certain records from another table A to temp table B, while doing insert i am having exception of unique constraint in table B how can i check which record is throwing exception while inserting in table A
for eg:
insert into A
select * from B;
i need to handle exception in which record of B i am getting unique constraint error

Hi,
If you add an error logging clause (with keywords LOG ERRORS), then you can insert a row into another table for each row that can't be inserted according to your INSERT statement.
To query table A to see which ids already exist in table B, you can say
SELECT *
FROM    a
WHERE   a_id IN (
                      SELECT b_id
                      FROM    b
where b.b_id is the unique key in table b, and a.a_id is the value you're truing to insert into that column.
If you just want to skip the insert when a matching row already exists, then use MERGE instead of INSERT.

Problem with Handling Exception in Jsp

hi
I am unable to handling exception in Jsp.
In my Simple Form i taken a simple text field named salary.
Details.jsp
<%@ page language="java" isErrorPage="true" errorPage="Det.jsp"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<html:html>
<html:form action="/det.do">
Enter Salary<html:text property="sal"/><br>
<br>
<html:submit value="SEND" />
</html:form>
</html:html>and my Actionclass is:
package com.gurukul.util;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class DetUserAction extends Action {
     String s=null;
     int sal;
public ActionForward execute(ActionMapping map,ActionForm form,HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
     try
     sal=Integer.parseInt(req.getParameter("sal"));
     if (sal>0)
          s="success";
     else
     throw new SalException(sal);}
     catch(SalException e)
          e.getMessage();
     return map.findForward(s);
and my Formbean is
package com.gurukul.util;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class DetUserAction extends Action {
     String s=null;
     int sal;
public ActionForward execute(ActionMapping map,ActionForm form,HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
     try
     sal=Integer.parseInt(req.getParameter("sal"));
     if (sal>0)
          s="success";
     else
     throw new SalException(sal);}
     catch(SalException e)
          e.getMessage();
     return map.findForward(s);
}and my struts-config.xml is
                              </form-bean>
                              <form-bean name="DetUser"
                       type="com.gurukul.util.DetUserForm">
                              </form-bean>
<action path="/det"
                      type="com.gurukul.util.DetUserAction"
                      name="DetUser"
                    input="/Details.jsp"
                       scope="request">
                       <exception key="errors.sal"
                       type="com.gurukul.util.SalException"
                       path="/jsp/Det.jsp"/>
                   <forward name="success" path="/jsp/DetailList.jsp" />
                   <forward name="failure" path="/jsp/Details.jsp"/>
                     </action>and Det.jsp(i.e error jsp) is
<%@ page language="java" isErrorPage="true"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<html:html>
<center><b>
Invalid Salary</b></center>
<%= exception.getMessage() %>
</html:html>but i didnt get exception on jsp.
please help me
Regards
VAS

hi
can you please guide me how to handle exceptions in Jsp(struts)?

Can we handled exceptions in Oracle EDQ?

Hi All,
I need to know, how to handle exceptions in EDQ? for example when i am fetcthing data from DB view, DB is down/ process is hanged then i have to send error msg to Webservice.
How can i handled this situation? Thanks in advance.
Regards,
Chandra

Hi,
This can be done, using the Triggers functionality, and a trigger that detects a certain type of error in a log and calls a web service.
Someone more experienced than me in writing triggers would probably need to help with an example.
Regards,
Mike

Handle Exceptions during the Render Response phase

Hi,
How can we handle exceptions that occur during the render response phase, e.g. to redirect the user to an error page?
In our application we have an unbounded taskflow with one page (jspx). It's quite a simple page, as it only displays some data from a managed bean.
When we run the application and e.g. throw explicitly a RuntimeException form one of the getters, all we get is the 'progress indicator', not even a stacktrace on the page (only in the logs).
Unfortunately, it doesn't seem possible to handle the exception, not via the taskflow Exception Handler, the web.xml error-page or a custom ADF Controller exception handler. In the latter case, we can catch the exception but when we try a redirect (on the external context or response) we get a 'java.lang.IllegalStateException: Response already committed' exception.
Any suggestions?
Ciao
Aino

Hi Aino
I'm not sure if that's the problem, but I recently read somewhere (wish I remember where) an IllegalStatementException that was throwing because there was no entry page defined in web.xml.
If you are trying that, remember that web.xml doesn't support .jspx pages.
Edited by: TheCrusader on 09-jul-2010 15:03
Edited by: TheCrusader on 09-jul-2010 15:10

Handling exceptions inside a Presentation

Similar Messages

Maybe you are looking for