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How to handle error: An exception occurred when invoking the operation ?

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Posted on by Teevo

393

Hello,

What is the best approach of handling error : An exception occurred when invoking the operation ? Or to make it more clear message of what /really/ happened ?

I tried to add Catch Exception, but it seems still not enough explanation of what happened ?

In then end, debugging is the only thing to do to know what is happening.

Is there any other way to firstly give a clear message of what is happening ? what is wrong or where. It is so good if the system can show on which class or object the error is.

Please help to advice. Thanks

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Layan Jwei 8,097 Super User 2025 Season 2 on at

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Hi Teevo,

Can you show us your code how are u catching the error? And what is the Operation exactly?

Also can you give us an example of the error? I mean the details of the error when you debugged.

But in general this way can catch most of errors:

System.Exception ex;
try
{
//Logic
}
catch(ex)
{
error(ex.Message);
}

Thanks,

Layan Jweihan

Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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Kevin Xia Microsoft Employee on at

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Hi,

Can you tell us why you need a more precise way to handle the problem, or you can show us a block of code that confuses you and let us show you what went wrong?

Generally speaking, the "try catch" block catches the vast majority of errors and throws them, and the reason why you think it's not a real error is probably because of an error thrown by the system source code, so it's hard to understand it literally and find a solution.

Best regards,

Kevin

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Bharani Preetham Pe... 3,634 Moderator on at

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While catching exceptions, we basically make use of exception type of error. But in standard, some of the errors are not actually errors and those are warnings. So that is why we can't get clear error. It only states "update has been cancelled" something like this. So, while writing exception code, you should be careful what to exclude and what is not. Please send your code so that we can help you with best answer.

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Teevo

393 on at

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Hi Kevin / Bharani,

Understand it cannot be too precise, but I expect the message is clear enough because I'm going to pass it through API. So some app outside the system can receive this error message. What I'm facing so far, some time there is an error but the message is blank, We don't know what happened until I tried to repeat the same action but manually inside D365.

The code however contain more than 1 class, so maybe this was the issue. Which is in illustration will be something like this:

Class A
{
    public str B()
    {

       try
           {
               ......
               classC = new classC();
               D = classC.process();
           }
       catch (Exception::CLRError)
            {
               .......
            }
        catch (Exception::Error)
            {
               .......
            }
        
        return B;

    }
}


Class classC()
{

    public str D()
    {
        try  // 1st-level try
        {
               ......
               salestable.insert();
               while select lines
               {
                  try
                  {
                       ........ 
                       salesline.insert();
                  }
                  catch (Exception::Deadlock)
                  {                   
                          if (xSession::currentRetryCount() >= #RetryNum)
                          {
                              throw Exception::Deadlock;
                          }
                          else
                          {
                               retry;
                          }
                    
                   }
                   catch (Exception::UpdateConflict)
                   {                   
                          if (appl.ttsLevel() == 0)
                          {
                                if (xSession::currentRetryCount() >= #RetryNum)
                                {
                                     throw Exception::UpdateConflictNotRecovered;
                                }
                                else
                                {
                                     retry;
                                 }
                           }
                           else
                           {
                                 throw Exception::UpdateConflict;
                            } 
                   }
                   catch(Exception::DuplicateKeyException)
                   {                   
                         if (appl.ttsLevel() == 0)
                         {
                                if (xSession::currentRetryCount() >= #RetryNum)
                                {
                                      throw Exception::DuplicateKeyExceptionNotRecovered;
                                }
                                else
                                {
                                      retry;
                                } 
                         }
                         else
                         {
                                throw Exception::DuplicateKeyException;
                         }
                    }
                    catch (Exception::Error)
                    {
               
                          container   infoData = infolog.infologData();
                          Str1260     errorTxt;

                          for (int i = 1; i <= conLen(infoData); i++)
                          {
                                container internalInfoData = conPeek(infoData, i);

                                if (errorTxt == "")
                                {
                                    errorTxt =  conPeek(internalInfoData, 2);
                                }
                                else
                                {
                                    errorTxt += ";" + conPeek(internalInfoData, 2);
                                }
                            }
                            errorMessage = errorTxt;
                            throw Error(errorMessage);
                       }
                   } // end while select
           } // end 1st-level try 
           catch (Exception::Deadlock)
           {          
                 if (xSession::currentRetryCount() >= #RetryNum)
                 {
                      throw Exception::Deadlock;
                 }
                 else
                 {
                       retry;
                 }
           
            }
            catch (Exception::UpdateConflict)
            {          
            
                  if (appl.ttsLevel() == 0)
                  {
                        if (xSession::currentRetryCount() >= #RetryNum)
                        {
                            throw Exception::UpdateConflictNotRecovered;
                        }
                        else
                        {
                            retry;
                        }
                  }
                  else
                  {
                       throw Exception::UpdateConflict;
                  }
             }
             catch(Exception::DuplicateKeyException)
             {          
            
                  if (appl.ttsLevel() == 0)
                  {
                        if (xSession::currentRetryCount() >= #RetryNum)
                        {
                             throw Exception::DuplicateKeyExceptionNotRecovered;
                        }
                        else
                        {
                             retry;
                        }
                   }
                   else
                   {
                       throw Exception::DuplicateKeyException;
                   }
              }
              catch (Exception::Error)
              {
               
                    container   infoData = infolog.infologData();
                    Str1260     errorTxt;

                    for (int i = 1; i <= conLen(infoData); i++)
                    {
                          container internalInfoData = conPeek(infoData, i);

                          if (errorTxt == "")
                          {
                              errorTxt =  conPeek(internalInfoData, 2);
                          }
                          else
                          {
                              errorTxt += ";" + conPeek(internalInfoData, 2);
                           }
                     }
                     errorMessage = errorTxt;
                     throw;
               }
    	      
               return D;	
      }
}

I'm wondering how to make this correctly ?

Class A is the one who will be passing the message to outside system (API). But as mentioned, at some of the time when we're doing test, there will be a blank error message which then make us confuse what is the error this time.

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Martin Dráb 237,795 Most Valuable Professional on at

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My guess it that your code fails to populate errorMessage variable and throw error(errorMessage) is then actually throw error(''). Debugging will tell you more about when it happens.

Note that in the outer catch, all the code for getting the message is useless, because you never use the value of errorMessage variable. By the way, I don't see a reason for having this code duplicated. If you eliminate the duplication, the risk of forgetting to change all occurrences will disappear.

Another problem in your code is that it takes all messages in infolog, even those related to your code in the try block.

I wonder what was the intention of the code. If you want a message of an exception, you can get it from the exception, can't you?. And if you want all infolog messages, what's the point of duplicating them by throwing them as an extra exception? You can simply collect infolog messages (you already have the code) and send them to the external system.

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Martin Dráb 237,795 Most Valuable Professional on at

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I think we can simplify your code (for the current discussion) to something like this:
class A { public void B() { System.Exception ex; try { new ClassC().process(); } catch (ex) { ... do something with ex ... } return ''; } } class ClassC() { public void process() { try { throw error("Test error"); } catch (Exception::Error) { container infoData = infolog.infologData(); str errorTxt; for (int i = 1; i <= conLen(infoData); i++) { container internalInfoData = conPeek(infoData, i); if (errorTxt == "") { errorTxt = conPeek(internalInfoData, 2); } else { errorTxt += ";" + conPeek(internalInfoData, 2); } } throw error(errorTxt); } } }

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Teevo 393 on at

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Hi Martin,

Thanks, I will try this. Just to make sure, so it means if I have process like Header and details (lines), like in Class C, I do not need to put another Try..Catch() in the while..select of the lines process. So only 1 Try..Catch() at the header level. This is what you are pointing why there is seems like a duplicate ?

I'm sorry, that is because I look into several blogs, and tried to summarize my self, so basically it is not the best practice.

Thanks.

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Martin Dráb 237,795 Most Valuable Professional on at

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Yes, your outer catch currently does nothing, which is likely as bug. It seems that your intention was duplicating the logic of the inner catch, which is not only unnecessary, but it would add all messages to infolog again, which would be another bug, in my opinion. You already duplicate all messages and if you did it again, you'd have all messages in infolog four times.

In short, you need catch statements at the place where you want to handle exceptions, not necessarily where they're thrown. I see you already have a catch statement in class A, so maybe you don't need any in ClassC at all.

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