Debugging is a crucial part in any programming development. In Apex, we’ve certain tools which will be used for debugging. one among them is that the system.debug() method which prints the worth and output of variable within the debug logs.
We can use the subsequent two tools for debugging −
• Developer Console
• Debug Logs

Debugging via Developer Console

You can use the Developer console and execute anonymous functionality for debugging the Apex as below −
Example
Consider our existing example of fetching the customer records which are created today. We just want to understand if the query is returning the results or not and if yes, then we’ll check the worth of List.
Paste the code given below in execute anonymous window and follow the steps which we’ve finished opening execute anonymous window.
Step 1 − Open the Developer console
Step 2 − Open the Execute anonymous from ‘Debug’ as shown below.

Step 3 − Open the Execute Anonymous window and paste the subsequent code and click on on execute.

// Debugging The Apex
List customerList = new List();
customerList = [SELECT Id, Name FROM APEX_Customer__c WHERE CreatedDate =
today];
// Our Query
System.debug('Records on List are '+customerList+' And Records are '+customerList);
// Debug statement to see the worth of List and Size

Step 4 − Open the Logs as shown below.

Step 5 − Enter ‘USER’ in filter condition as shown below.
Step 6 − Open the USER DEBUG Statement as shown below.

Debugging via Debug Logs

You can debug an equivalent class via debug logs also . Suppose, you’ve got a trigger in Customer object and it must be debugged for a few variable values, then you’ll do that via the debug logs as shown below −
This is the Trigger Code which updates the outline field if the modified customer is active and you would like to see the values of variables and records currently in scope −

trigger CustomerTrigger on APEX_Customer__c (before update) {
List customerList = new List();
for (APEX_Customer__c objCust: Trigger.new) {
System.debug('objCust current value is'+objCust);

if (objCust.APEX_Active__c == true) {
objCust.APEX_Customer_Description__c = 'updated';
System.debug('The record which has satisfied the condition '+objCust);
}
}
}

Follow the steps given below to get the Debug logs.
Step 1 − Set the Debug logs for your user. attend Setup and sort ‘Debug Log’ in search setup window then click on Link.

Step 2 − Set the debug logs as following.

Step 3 − Enter the name of User which needs setup. Enter your name here.

Step 4 − Modify the customer records as event should occur to get the debug log.

Step 5 − Now attend the debug logs section again. Open the debug logs and click on on Reset.

Step 6 − Click on the view link of the primary debug log.

Step 7 − look for the string ‘USER’ by using the browser search as shown below.

The debug statement will show the worth of the sector at which we’ve set the purpose.
So, this brings us to the end of blog. This Tecklearn ‘How to Perform Debugging in Apex’ blog helps you with commonly asked questions if you are looking out for a job in Salesforce. If you wish to learn Salesforce and build a career in Salesforce domain, then check out our interactive, Salesforce Certification Training: Admin 201 and App Builder, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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Salesforce Fundamentals
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Understanding Salesforce Platform
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• About Salesforce Certification
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Salesforce Development and Apex Programming
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About Preparation of Salesforce 201 and App Builder Certification exams

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