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Salesforce Developer Interview Questions Part5

Salesforce Developer Interview Questions – Apex debugging and Exception handling

APEX- Debugging and Exception handling

54. What is debugging and How do you debug apex ?


Debugging can be defined as the process of finding the root cause of a problem or a bug in a code and fixing it.

Salesforce provides debug logs to debug apex . We can also access debug logs from the developer console.

55. Can you explain the steps to debug the code in apex?


Step 1 : Enable the debug logs . To enable the debug logs goto setup → Quick find Debug logs →

Click New “Select the users for which you want to enable debug logs”

Enter “Start Date”

Enter “Expiration Date”

Enter “Debug Level “

Step 2 : Run the functionality for which you want to debug .

Step 3 : Go back to the debug logs from setup and Open the debug logs for that particular user.

Step 4 : Analyze the debug logs to find the issue.

56. What does the debug log file contain or What information does the debug log provide?


Debug log provides the information about the following.

  • Database changes
  • HTTP callouts
  • Apex errors
  • Resources used by Apex

Automated workflow processes, such as:

  • Workflow rules
  • Assignment rules
  • Approval processes
  • Validation rules
  • Process builder

Note : The debug log does not include information from actions triggered by time-based workflows.

57. Why do we use system.debug()?


  • System.debug is used to print information of a specific line of code in apex or triggers.
  • Apart from the general debug information, debug logs contains the information from system.debug statements.

Ex: If we want to see if a particular list or set is updated with right values after the logic is processed then we write system.debug to see that list

System.debug(‘accList ⇒’ + accList);

58. What is an exception and what happens when an exception occurs?


Exception is an error or event that disrupts the normal flow of code execution. When an exception occurs , code execution halts.

59. What are exception statements?


There are two exception statements:

  • Throw statements : Used to generate exception
  • Try, catch, and finally : Used to gracefully recover from an exception.

60. Name a few built-in exception types?


  • DMLExcption
  • ListExcption
  • NullPointerException
  • QueryException
  • SObjectException

61. Provide an example of handling generic exceptions as well as specific exceptions using built-in exception types?


62. Can you write sample code for a custom exception?


63. Can we handle governors limit exceptions using try catch ?


  • NO.
  • When we encounter governor limits, code executions halts immediately and this cannot be handled using exception handling .

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