CostaCloud Application Developer Interview Questions and Answers

SpringBootAnnotation is used to enable Spring Boot features in a Java application. @Controller is used for MVC pattern, @RestController is used for RESTful web services.

• SpringBootAnnotation is used to enable Spring Boot features like auto-configuration, component scanning, etc.

• @Controller is used for MVC pattern to handle web requests and return a view, while @RestController is used for RESTful web services to return d...read more

Stream API in Java provides a way to process collections of objects in a functional style.

• Stream API allows for easy manipulation of collections using functional programming concepts like map, filter, and reduce.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(System.out::println);

• Lambda expressions can be used with Stream API to define behavio...read more

Ansible architecture is based on a client-server model where the control machine communicates with managed nodes using SSH.

• Ansible control machine: where playbooks are written and executed

• Managed nodes: machines that are being managed by Ansible

• Inventory: list of managed nodes

• Playbooks: automation scripts written in YAML format

• Modules: reusable units of code that perform specific tasks on managed nodes

Cmd is used to specify the default command to run when a container is started, while entry point is used to specify the executable that will run when the container starts.

• Cmd is optional and can be overridden at runtime, while entry point is required and cannot be overridden.

• Cmd is used to provide default arguments for the entry point command.

• Example: CMD ["python", "app.py"] - specifies the default command to run the ...read more

To stop a container, use the 'docker stop' command followed by the container ID or name.

• Use 'docker ps' command to list all running containers

• Identify the container ID or name of the container you want to stop

• Run 'docker stop ' to stop the container

A business rule is a specific guideline or constraint that dictates how a business operates or makes decisions.

• Business rules are typically defined by stakeholders or subject matter experts.

• They help ensure consistency, compliance, and efficiency in business processes.

• Examples include age restrictions for purchasing alcohol, pricing strategies, and approval processes for expenses.

An update set is a group of changes that can be moved from one instance to another in ServiceNow.

• Update sets are used to transport customizations, such as new fields, tables, or scripts, between instances.

• They help in organizing changes and tracking what customizations are being moved.

• Update sets can be previewed, committed, and rolled back if needed.

• Example: Creating a new field in a development instance and moving it

Constructors are special methods used to initialize objects in a class.

• Constructors have the same name as the class.

• Types of constructors include default, parameterized, copy, and static constructors.

• Example: public class Person { public Person() { } }