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To implement a robust search feature in a Java-based web application that allows users to filter items (such as products) by multiple optional criteria (e.g., name, category, or status), the most effective approach is to dynamically build the SQL query based on the parameters provided. This ensures that the application only filters by the field ...

1. Project Dependencies Add the following coordinates to your pom.xml to enable Swagger 2 and the enhanced Bootstrap UI theme: <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.9.2</version> </dependency> <dependency> <grou ...

DataSource Context Holder Implementation Based on Deque public class DataSourceContextManager { // Using ThreadLocal<Deque> to support nested data sources private static final ThreadLocal<Deque<DataSourceEnum>> CONTEXT_HOLDER = ThreadLocal.withInitial(ArrayDeque::new); /** * Push data source type ...

Executor FrameworkIn concurrent programming, separating the management of threads from the business logic of tasks creates more maintainable and scalable applications. The java.util.concurrent package provides the Executor framework to handle this decoupling. Instead of explicitly creating threads using new Thread(runnable).start(), developers ...

Generic Service Invocation Traditionally, Dubbo services require a shared API jar containing interface definitions. However, generic invocation allows a consumer to call a remote method without having the interface class in its classpath. This is useful for gateway services or dynamic scripting scenarios where the caller only needs to know the ...

Swagger Overview Swagger is an open-source framework that simplifies API documentation by generating interactive, machine-readable specifications from code annotations. It enables frontend and backend teams to collaborate efficiently by providing real-time API documentation and a built-in testing interface. Project Setup Maven Dependencies Add ...

String Class Initializing Strings Strings can be created using literals or constructors. Using String Literals String s1 = null; String s2 = ""; String s3 = "Hello"; Using Constructors String s4 = new String(); // Empty string String s5 = new String("World"); char[] letters = {'J', 'a', 'v', 'a'}; String s6 = new ...

Java 8: Key Features and Functional Programming Enhancements Java 8 (also known as JDK 1.8) represents a significant release in the evolution of the Java programming language. Released by Oracle on March 18, 2014, this version introduced functional programming capabilities, a new JavaScript engine, an enhanced date-time API, and the Stream API ...

synchronized vs volatile In Java concurrency, synchronized and volatile are two fundamental mechanisms for ensuring thread safety, but they serve different purposes. The synchronized keyword establishes a mutual exclusion lock. When a method or code block is decorated with synchronized, only one thread can execute that critical section at any g ...

Dynamic SQL is one of MyBatis’s most powerful features. While basic MyBatis usage simplifies JDBC boilerplate, dynamic SQL empowers developers to construct queries that adapt intelligently to varying runtime conditions—making data access logic both flexible and maintainable. This guide explores the core constructs of MyBatis dynamic SQL through ...