10+ Scientific Security Management Services Interview Questions and Answers

OAuth2 is a protocol for authentication and authorization that allows third-party applications to access user data without sharing passwords.

• OAuth2 provides a secure and standardized way for users to grant access to their resources to third-party applications.

• It involves the exchange of tokens between the user, the third-party application, and the resource server.

• Authentication is handled by the authorization server, which verifies the user's identity and issues an access tok...read more

Design patterns in Java are reusable solutions to common software design problems.

• Design patterns should be used when there is a recurring problem in software design.

• Design patterns can improve code readability, maintainability, and scalability.

• Examples of design patterns include Singleton, Factory, Observer, and Decorator.

• It's important to choose the right design pattern for the specific problem at hand.

• Design patterns should not be overused and should be balanced with simpl...read more

JWT is a token format while OAuth2 is a protocol. Both can be used to secure REST endpoints.

• JWT is a self-contained token that contains user information and can be used for authentication and authorization.

• OAuth2 is a protocol that allows third-party applications to access user data without sharing passwords.

• To secure REST endpoints, both JWT and OAuth2 can be used depending on the use case.

• For example, JWT can be used for stateless authentication while OAuth2 can be used for...read more

Java 8 streams are functional programming constructs that allow for efficient processing of large data sets.

• Streams are composed of a source, intermediate operations, and a terminal operation.

• Intermediate operations include filter, map, and sorted, and are lazily evaluated.

• Terminal operations trigger the evaluation of the stream and include forEach, reduce, and collect.

• Streams can be parallelized for even greater performance.

• Streams are designed to work with lambdas and funct...read more

Async in Spring Boot allows non-blocking I/O operations, improving application performance.

• Async enables parallel processing of requests, improving throughput.

• It allows the application to handle more requests with the same resources.

• It reduces the response time for long-running operations.

• Use @Async annotation to mark methods as asynchronous.

• Use CompletableFuture to handle async results.

• Example: @Async public CompletableFuture asyncMethod()

• Example: CompletableFuture result = ...read more

Fixed thread pool has a fixed number of threads while cached thread pool creates new threads as needed.

• Fixed thread pool is suitable for tasks with a known number of threads

• Cached thread pool is suitable for tasks with unknown number of threads

• Fixed thread pool can cause resource wastage if the number of threads is too high

• Cached thread pool can cause performance issues if the number of threads is too high

• Example: Fixed thread pool can be used for a web server with a fixed nu...read more

Using cache with Spring Boot

• Add @EnableCaching annotation to main class

• Add @Cacheable annotation to methods that need caching

• Configure cache properties in application.properties file

• Use CacheManager to manage caches

• Example: @Cacheable(value = "users", key = "#id")

Filter is a method used to extract specific data from a larger set based on certain criteria.

• Filter is required to extract specific data from a larger set.

• It is used to reduce the amount of data that needs to be processed.

• Filter can be applied to arrays, objects, and even strings.

• Examples include filtering out all even numbers from an array or all emails from a list that contain a specific keyword.

Spring app config can be handled using various methods such as XML configuration, Java configuration, and annotation-based configuration.

• XML configuration involves creating an XML file and defining beans and their dependencies.

• Java configuration involves creating a Java class and using annotations to define beans and their dependencies.

• Annotation-based configuration involves using annotations to define beans and their dependencies.

• Spring Boot provides a convenient way to hand...read more

Spring MVC follows the Model-View-Controller (MVC) pattern for building web applications.

• Model represents the data and business logic

• View renders the model data and provides user interface

• Controller handles user requests, updates model and selects view

• Spring MVC provides DispatcherServlet as front controller

• RequestMapping annotation maps URL to controller method

• ModelAndView object returns model data and view name

Improving application performance requires optimizing code, database queries, and server resources.

• Identify and fix slow database queries

• Use caching to reduce server load

• Optimize code by reducing unnecessary loops and improving algorithms

• Use a content delivery network (CDN) to reduce server load

• Upgrade server hardware or use cloud-based resources

• Minimize HTTP requests and reduce file sizes for faster page load times