Vista Foundation Interview Questions and Answers

Authentication is the process of verifying the identity of a user, while authorization is the process of granting access to specific resources.

• Authentication confirms the user's identity through credentials such as username and password.

• Authorization determines what resources the user can access based on their role or permissions.

• Authentication precedes authorization in the security process.

• Examples of authentication i...read more

CORS error occurs due to security restrictions in browsers that prevent web pages from making requests to a different domain.

• CORS stands for Cross-Origin Resource Sharing.

• It is a security feature implemented in web browsers to prevent malicious scripts from accessing data from a different domain.

• APIs that are hosted on a different domain than the web page making the request will trigger a CORS error.

• To resolve this err...read more

Decorators are used in Angular to modify classes, methods, and properties at compile-time.

• Component: marks a class as an Angular component and provides metadata about the component

• Directive: marks a class as an Angular directive and provides metadata about the directive

• Pipe: marks a class as an Angular pipe and provides metadata about the pipe

• Injectable: marks a class as an Angular service and provides metadata about t...read more

Exception handling in Java Spring Boot

• Use try-catch blocks to catch exceptions

• Use @ExceptionHandler annotation to handle exceptions globally

• Use @ControllerAdvice annotation to handle exceptions across multiple controllers

• Use ResponseEntity to return custom error messages and HTTP status codes

Association Mapping in Hibernate is a way to map relationships between entities in a database. @ManyToMany is used for many-to-many relationships.

• Association Mapping is used to define relationships between entities in Hibernate

• @ManyToMany is used to define a many-to-many relationship between two entities

• It requires a join table to store the relationship between the two entities

• The @JoinTable annotation is used to speci...read more

ORM tools provide abstraction, simplify database operations, improve code maintainability, and enhance productivity.

• ORM tools abstract the database layer, allowing developers to work with objects instead of writing complex SQL queries.

• They simplify database operations by automatically generating SQL queries based on object-oriented code.

• ORM tools handle database connections, transactions, and caching, reducing the amou...read more

Lazy loading is a technique used to load only the required modules/components on demand.

• It improves the performance of the application by reducing the initial load time.

• It is achieved by using the loadChildren method in the routing configuration.

• Lazy loaded modules are loaded only when the user navigates to the respective route.

• It can be implemented by creating a separate module for each feature and loading it lazily.

Business logic, presentation logic, and service logic can be separated using Angular's component architecture.

• Create separate components for each logic layer

• Use services to handle business logic

• Use pipes for presentation logic

• Keep components simple and focused on one task

• Use dependency injection to share services between components

Relationships between tables in MYSQL Db are established using foreign keys.

• Use the FOREIGN KEY constraint to link a column in one table to a column in another table.

• The column in the child table must have the same data type as the column in the parent table.

• The referenced column in the parent table must be a PRIMARY KEY or UNIQUE index.

• Use ON DELETE and ON UPDATE to specify what happens when a referenced row is delete...read more

SQL is a relational database management system while NoSQL is a non-relational database management system.

• SQL databases are table-based and use structured query language for defining and manipulating data.

• NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores.

• SQL databases are vertically scalable while NoSQL databases are horizontally scalable.

• SQL databases are good for complex quer...read more

Relationships can be established using references or embedding in MongoDB.

• References can be used to link documents in different collections.

• Embedding can be used to store related data within a single document.

• The choice between referencing and embedding depends on the data model and query requirements.

• Use $lookup to perform a left outer join between two collections.

• Use $graphLookup to perform a recursive search on a co...read more

Yes, I have used Material UI extensively for UI development.

• I have used Material UI components such as AppBar, Button, TextField, etc.

• I have customized the theme and created my own styles using Material UI's styling solution.

• I have used Material UI's responsive design features to create mobile-friendly UIs.

• I have also used Material UI's icons and typography components.

• Overall, I find Material UI to be a very useful and...read more

Yes, I have experience working with AWS and GCP.

• I have worked with AWS services like EC2, S3, RDS, Lambda, and CloudFormation.

• I have also worked with GCP services like Compute Engine, Cloud Storage, and Cloud Functions.

• I am familiar with deploying applications on both AWS and GCP.

• I have experience with setting up and configuring security groups, load balancers, and auto-scaling groups.

• I am comfortable working with both...read more

Static websites can be hosted in s3 bucket by enabling static website hosting and configuring bucket policy.

• Enable static website hosting in s3 bucket properties

• Upload website files to s3 bucket

• Configure bucket policy to allow public access

• Access website using endpoint URL