Summary of 2-7 Years Interview Experience | Java | Spring Boot | Microservices | SQL | Barclays

Main Ideas and Concepts

• Deployment Process of Spring Boot Applications
  • Write Spring Boot microservices.
  • Create a Docker image and push it to AWS Elastic Container Registry (ECR).
  • Use AWS CodePipeline to deploy to AWS Elastic Container Service (ECS).
  • An EML file is used to automate deployment steps.
• Exception Handling in Java
  • Understand the hierarchy of exceptions (Throwable → Exception → Error).
  • Distinguish between checked exceptions (e.g., IOException) and unchecked exceptions (e.g., ArithmeticException).
  • Catch blocks should handle the most specific exceptions first to avoid compilation errors.
• Difference Between throw and throws
  • throw is used to explicitly throw an exception, while throws is used in a method signature to declare exceptions that a method can throw.
• Java 8 Features
  • Key features include Lambda expressions, functional interfaces, method references, and the Stream API.
  • Parallel streams allow for concurrent data processing but come with challenges like thread safety and debugging difficulties.
• Stream API Advantages
  • Promotes functional programming, reduces boilerplate code, and improves performance with lazy evaluation.
  • Supports parallel processing and ensures type safety with generics.
• Serialization in Java
  • serialVersionUID is used to ensure compatibility between serialized and deserialized objects.
• Synchronized Maps
  • HashMap is not synchronized; use ConcurrentHashMap for concurrent access or Collections.synchronizedMap() for a synchronized version.
• Static Methods
  • Static methods can be overloaded but not overridden because they belong to the class rather than instances.
• Spring Boot Annotations
  • @RequestMapping, @GetMapping, @PostMapping for handling HTTP requests.
  • @Primary and @Qualifier for bean preference when multiple beans of the same type exist.
  • @ComponentScan for including beans from different packages.
  • Actuator for monitoring application health and metrics.

Methodology and Instructions

• Deployment Steps
  • Write microservices.
  • Create Docker images and push to ECR.
  • Use AWS CodePipeline for deployment to ECS.
  • Automate with an EML file.
• Exception Handling Order
  • Catch exceptions in the order from most specific (child class) to least specific (parent class).
• Using Java 8 to Remove Spaces from a String
  • Use replaceAll method or stream filtering to remove spaces.
• Using @RequestParam and @PathVariable in Spring
  • Use @RequestParam for query parameters and @PathVariable for path parameters in URLs.

Speakers or Sources Featured

The video appears to feature a single speaker discussing these technical topics, likely a candidate or interviewer with experience in Java, Spring Boot, and related technologies. Specific names of speakers or sources are not mentioned in the subtitles.

Notable Quotes

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Category

Educational

Video