Handling Exceptions, Intro to Spring Data JPA Flashcards
What annotation is used to create a centralized exception handler in Spring?
@ControllerAdvice is used to create a centralized exception handler in Spring.
How can you handle a specific exception within a controller in Spring Boot?
By using @ExceptionHandler within the controller for the specific exception type, you can handle exceptions at the controller level in Spring Boot.
What’s the purpose of @ExceptionHandler in Spring?
@ExceptionHandler is used to define methods that handle specific exceptions thrown by request handling methods in Spring controllers.
What is the benefit of using centralized exception handling in Spring applications?
Centralized exception handling helps in separating exception handling logic from regular controller logic, making the code more organized and maintainable.
How do you define a custom exception in Java for use in Spring applications?
You can create a custom exception by extending the RuntimeException class or its subclasses.
In Spring Boot, what’s the recommended way to return custom error responses when an exception occurs?
Using ResponseEntity along with appropriate HTTP status codes and custom error messages is a recommended way to return custom error responses in Spring Boot.
What is @ControllerAdvice used for in Spring?
@ControllerAdvice is an annotation used in Spring to define global elements to be used across multiple controllers. It primarily allows centralized handling of exceptions and applying global configurations to all or selected controllers.
What types of concerns can be addressed using @ControllerAdvice in Spring?
@ControllerAdvice can handle various concerns such as exception handling, model attributes shared across multiple controllers, and applying response modifications.
Can you specify the scope of controllers affected by @ControllerAdvice?
Yes, you can narrow down the scope by specifying the base packages or specific controllers using the basePackageClasses or basePackages attribute within @ControllerAdvice.
Apart from handling exceptions, what other functionalities can @ControllerAdvice provide?
It can assist in manipulating the model attributes before they are added to the model by using @ModelAttribute annotated methods within @ControllerAdvice.
How does @ControllerAdvice relate to @ExceptionHandler?
@ExceptionHandler is one of the functionalities provided by @ControllerAdvice. It’s used to define methods that handle specific exceptions thrown by request handling methods in Spring controllers.
What is Object-Relational Mapping (ORM)?
ORM is a programming technique that facilitates the conversion of data between incompatible type systems—object-oriented programming languages and relational databases—by mapping objects to database tables.
How does ORM work?
ORM frameworks provide a layer of abstraction between the application and the database, enabling developers to interact with databases using object-oriented principles, where classes represent tables and instances represent rows.
What are the primary advantages of using ORM?
ORM simplifies database interactions by allowing developers to use programming language constructs instead of writing complex SQL queries, promotes code reusability, and abstracts database-specific implementation details.
What are some popular ORM frameworks or libraries?
Examples of ORM frameworks include Hibernate (for Java), Entity Framework (for .NET), Django ORM (for Python), Sequelize (for Node.js), and SQLAlchemy (for Python).
What considerations should be taken into account while using ORM?
Proper understanding of the underlying SQL queries generated by ORM, performance implications, optimization techniques, and ensuring compatibility with the database schema are essential while using ORM in development.
What is the purpose of JDBC?
JDBC facilitates the connection between Java applications and databases, providing a standard interface to execute SQL queries, retrieve results, and manage database transactions.
How does JDBC work?
JDBC operates by using JDBC drivers to establish connections to the database, sending SQL queries, processing results, and handling transactions through a set of interfaces and classes provided by the JDBC API.
What are the main components of JDBC?
JDBC consists of the DriverManager class for managing connections, the Connection interface for connecting to a database, the Statement and PreparedStatement interfaces for executing SQL queries, and the ResultSet interface for handling query results.
What are some common operations performed using JDBC?
Common JDBC operations include establishing connections to databases, executing queries (INSERT, UPDATE, DELETE), retrieving query results, managing transactions, and handling exceptions related to database interactions.
What is @ControllerAdvice in Spring MVC?
@ControllerAdvice is an annotation used in Spring MVC to define global exception handlers, centralized model attributes, and common behavior for multiple controllers.
What is the purpose of @ControllerAdvice?
@ControllerAdvice allows centralized exception handling, enabling developers to define methods to handle exceptions across multiple controllers within an application.
How is @ControllerAdvice used in Spring MVC?
Annotated classes with @ControllerAdvice contain methods annotated with @ExceptionHandler to handle specific exceptions thrown by controller methods.
What types of operations can be performed using @ControllerAdvice?
With @ControllerAdvice, developers can define exception handling methods (@ExceptionHandler), add model attributes to all controllers (@ModelAttribute), and more.
