Learnitweb

Author: Editorial Team

  • @ConditionalOnClass in Spring Boot

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    1. What is @ConditionalOnClass in Spring Boot? The @ConditionalOnClass annotation is used to conditionally register a bean or configuration in Spring Boot only if a specific class (or classes) is present on the classpath. It is part of Spring Boot’s conditional annotations family and is commonly used in auto-configuration classes or modular application design. 2.…

  • @ConditionalOnProperty annotation in Spring Boot

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    1. Introduction to @ConditionalOnProperty In Spring Boot, the @ConditionalOnProperty annotation is used to conditionally enable or disable a bean registration based on the presence and value of a property in the application’s configuration files (like application.properties or application.yml). It is part of the Spring Boot auto-configuration mechanism and is mainly used to write conditional logic…

  • @CachePut Annotation

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    1. Introduction The @CachePut annotation in Spring Framework is used to update the cache without interfering with the method execution. Unlike @Cacheable, which may skip the method execution if the value is already in the cache, @CachePut always executes the method and updates the cache with the result. 2. Use Case Use @CachePut when: 3.…

  • @Valid annotation

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    1. What is @Valid in Spring Boot? The @Valid annotation is part of the Java Bean Validation (JSR-380) standard, implemented by libraries like Hibernate Validator. It is used to trigger validation on a Java object’s fields based on annotations such as @NotNull, @Size, @Email, etc. 2. Dependencies Required Spring Boot starter automatically includes Hibernate Validator…

  • @Resource Annotation in Spring

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    1. Introduction The @Resource annotation is part of the Java EE (now Jakarta EE) standard. It allows Spring to perform dependency injection similar to @Autowired, but with slightly different behavior—especially in how beans are resolved. 2. What is @Resource? Import Statement 3. Behavior of @Resource Spring handles @Resource by name first, and by type second…

  • @Inject Annotation in Spring Boot

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    1. Introduction The @Inject annotation is part of Java’s standard dependency injection specification, defined in JSR-330 (Java Specification Request). It allows you to inject dependencies into Spring-managed beans in a way that’s decoupled from the Spring framework itself. 2. What is @Inject? @Inject is a standard annotation provided by Javax Dependency Injection API (javax.inject.Inject) for…

  • Oracle Indexes

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    1. Introduction to Indexes An index is a performance-optimizing structure that Oracle uses to minimize data access time by providing faster lookup capabilities. Instead of scanning the entire table to find rows matching a condition, Oracle can use the index to locate them more efficiently — just like using an index in a book instead…

  • Views vs Materialized Views in Oracle

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    1. Introduction In Oracle, both Views and Materialized Views (MViews) serve as saved queries that simplify data retrieval and improve abstraction. However, views are virtual and always reflect real-time data, while materialized views store a physical snapshot of the data and can be refreshed periodically. Understanding the difference is crucial for choosing the right tool…

  • Why Redis is so fast?

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    The full form of Redis is REmote DIctionary Server. Redis has earned a stellar reputation for its blistering speed and efficiency, making it a cornerstone technology for countless high-performance applications, including caching, real-time analytics, session management, and message brokering. Its ability to handle millions of operations per second with sub-millisecond latency is a testament to…

  • Daemon Threads in Java

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    1. Introduction to Threads in Java In Java, threads are used to perform tasks concurrently. There are two types of threads: 2. What is a Daemon Thread? A Daemon Thread in Java is a thread that runs in the background and does not prevent the JVM from exiting. Examples of daemon threads: These threads are…