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In a Spring Boot application, the console startup banner is driven by a file named banner.txt. Place it under src/main/resources to replace the default Spring artwork. Composing the Banner The file supports plain text, ASCII art, and property placeholders using ${...} syntax. Colors are applied via ${AnsiColor.xxx} constants defined in org.spri ...

Environment Setup and Installation 1. Deploying Java Environment Install the OpenJDK runtime environment using the system package manager. yum install java-1.8.0-openjdk -y java -version 2. Installing Tomcat Download the binary distribution from the Apache mirror, extract it, and configure the environment variables. mkdir -p /data/software cd ...

Annotations in Java, introduced in JDK 1.5, serve as a form of metadata, providing declarative information about code elements. Unlike comments, which are for human readers, annotations are intended for the Java compiler or runtime environment. Annotations can be applied to packages, classes, fields, methods, and parameters, offering insights o ...

The java.net.URL class can parse a URL string and expose its components. To obtain the portocol and host, create a URL instanec and call getProtocol() and getHost(). import java.net.URL; public class UrlParser { public static void main(String[] args) throws Exception { URL endpoint = new URL("https://docs.oracle.com/en/java/&q ...

In modern software development, connecting your application with external services is a common requirement. Whether you need to process payments, send SMS notifications, or integrate with cloud platforms, understanding how to interact with third-party APIs is essential. This guide walks through the process of integrating external services using ...

Understanding Streams in Java Introduction and Stream Utility Consider a scenario where you need to filter and process a collection of strings. Given a list of names, the task are: extract names starting with a specific prefix, further filter those by length, and finally display the results. Example using a traditional approach: import java.uti ...

Log4j2 offers significant advantages over Logback, particularly in terms of performance and asynchronous logging capabilities. While Spring Boot typically uses Logback by default, there are compelling reasons to consider Log4j2 instead, especially in high-concurrency scenarios where async logging can make a substantial difference in system perf ...

Introduction: The Problem with Regular Classes for Fixed Sets of Values Consider designing a Season class that should only represent a finite set of values (spring, summer, autumn, winter) and be read-only. A regular class fails because it allows unlimited instances and mutable data through setters. Example: Inadequate regular class public clas ...

Dynamic SQL for Date Range and List Queries When building dynamic queries in MyBatis, it's common to filter by date ranges and iterate over a list of values. Below is an example showing how to handle both scenarios using MyBatis dynamic SQL with where, if, and foreach tags. SQL Mapping <select id="selectQuotaManagement" resultType= ...

Implementing Conversation Memory in Java AI Agents for Reimbursement Systems Core Objective: Adding Memory to Reimbursement Processes In reimbursement scenarios, convesrations typically span multiple turns, such as: User: "I need to expense a business trip" Assistant: "Sure, please provide the amount and purpose" User: &quot ...