EPAM Systems Interview Questions, Process, and Tips

A functional interface is an interface that contains only one abstract method and can be used as a lambda expression.

• Functional interfaces can have multiple default or static methods, but only one abstract method.

• Functional interfaces are used in lambda expressions to provide implementation for the abstract method.

• Examples of functional interfaces in Java include Runnable, Callable, and ActionListener.

Types of locks include mutex locks, spin locks, read-write locks, and file locks.

• Mutex locks: used to protect shared resources by allowing only one thread to access the resource at a time.

• Spin locks: busy-waiting locks that repeatedly check for the lock to become available.

• Read-write locks: allow multiple readers or a single writer to access a resource.

• File locks: used to prevent multiple processes from simultaneously

A server-side script can be called from a UI action by defining a script action in the UI action configuration.

• Define a script action in the UI action configuration with the appropriate server-side script function

• Use gs.eventQueue() to trigger the server-side script from the UI action

• Ensure proper permissions are set for the server-side script to be executed

OAuth authentication is a secure way to grant access to resources without sharing credentials.

• OAuth stands for Open Authorization

• It allows a user to grant a third-party application access to their resources without sharing their credentials

• OAuth uses tokens for authentication instead of passwords

• It is commonly used in APIs and web applications for secure authorization

Different types of business rules include client scripts, UI policies, data policies, and script includes.

• Client scripts are used to run on the client side to perform actions or validations.

• UI policies are used to set mandatory fields, read-only fields, or visibility conditions on forms.

• Data policies are used to enforce data consistency and integrity by defining rules on fields.

• Script includes are reusable scripts that...read more

An asynchronous business rule is a rule that runs in the background without blocking the user interface.

• Asynchronous business rules are commonly used for long-running processes that do not require immediate user interaction.

• They can be used for tasks such as sending email notifications, updating records in bulk, or performing complex calculations.

• An example of an asynchronous business rule could be a rule that triggers...read more

Methods to call a server-side script from a client-side script

• Using AJAX to make a server-side request

• Using REST API calls to interact with server-side scripts

• Using server-side events triggered by client-side actions

• Using server-side functions called from client-side scripts

Triggers in Flow Designer are events that initiate a flow when a specified condition is met.

• Triggers are used to start a flow based on a specific event or condition

• They can be configured to listen for events like record creation, updates, or deletions

• Triggers can also be set to run on a schedule or at a specific time

Input can be passed to a workflow activity using input parameters.

• Define input parameters in the workflow activity

• Pass values to the input parameters when starting the workflow

• Access the input parameters within the workflow activity

To send a report with an attachment regarding an incident, follow these steps.

• Navigate to the incident record in ServiceNow

• Click on the 'More Options' menu and select 'Create PDF'

• Attach the PDF report to the incident record

• Notify the relevant stakeholders about the attached report

The different types of server-side scripts include Business Rules, Script Includes, UI Policies, and Client Scripts.

• Business Rules are used to define custom server-side logic that runs when a record is inserted, updated, or deleted.

• Script Includes are reusable scripts that can be called from other scripts or business rules.

• UI Policies are used to set mandatory or read-only fields on a form based on certain conditions.

• C...read more

getXML, getXMLWait, and getXMLAnswer are different methods in ServiceNow for handling XML data.

• getXML is used to retrieve XML data synchronously.

• getXMLWait is used to retrieve XML data asynchronously.

• getXMLAnswer is used to retrieve XML data and wait for a response.

Glide system objects are used in ServiceNow to interact with the platform and perform various operations.

• GlideRecord

• GlideSystem

• GlideAggregate

• GlideForm

• GlideUser

Factory & Builder Design Patterns are creational patterns used in software development to create objects.

• Factory Design Pattern is used to create objects without specifying the exact class of object that will be created.

• Builder Design Pattern is used to construct complex objects step by step.

• Factory pattern uses a factory method to create objects, while Builder pattern uses a builder class to construct objects.

• Factory ...read more