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Dockerfile Commands Overview Dockerfiles are text-based scripts that define how to build Docker images. Below is a comprehensive reference of essential Dockerfile instructions. Core Instructions ARG variable_name[=default_value] # Defines build-time variables accessible via --build-arg during docker build FROM base_image[:tag] [@digest] [AS bu ...

Componant Implementation DataSource Annotation DataSource.java AspectJ Implementation DataSourceAspect.java Data Source Constants DataSourceConstants.java Dynamic Data Source DynamicDataSource.java Configuration DataSourceConfig.java DataSource Annotation package com.example.datasource.config; import java.lang.annotation.*; ...

Adding the Required Dependency Include the Spring Boot Data JPA starter in your POM file to enable JPA repository support: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> Configuring Aplication Properties Set up your databa ...

Common Conversion Specifiers Date and Time %d{pattern}: Outputs the current timestamp. For example, %d{yyyy-MM-dd HH:mm:ss.SSS} yields 2024-07-11 15:34:55.123. Log Level %level or %p: Renders the log severity (e.g., INFO, DEBUG, WARN, ERROR). Message and Source Context %msg or %m: The actual log message. %C or %class: Fully qualified class ...

Introduction to GraphQL Kotlin GraphQL Kotlin is a collection of libraries built on top of graphql-java, specifically designed for the Kotlin language. Its primary goal is to streamline the development of both GraphQL clients and servers. This guide provides an overview of the project's key features and how to use them effectively. Project Over ...

Custom Spring Boot starters are valuable for encapsulating common functionalities, such as integrating with notification services like Feishu or DingTalk, or standardizing response code handling. Project Setup Initialize a Maven Project: Create a new Maven project, for instance, named holmium-spring-boot-starter. Implement Core Functionalit ...

Configuration Setup Establish database connectivity and tune the connection pool via application.yml. The following excerpt demonstrates HikariCP parameter optimization alongside MyBatis scanning direcitves. server: port: 8080 spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://db-server:3306/data_stor ...

Project Setup with MyBatis-Plus and Gradle Start with a standard Spring Boot 2.3.x project using Gradle. Below is a minimal build.gradle configuration: plugins { id 'org.springframework.boot' version '2.3.12.RELEASE' id 'io.spring.dependency-management' version '1.0.11.RELEASE' id 'java' } group = 'com.example' version = '0.0.1-SNA ...

Introduction Implementing data export functionality is a common requirement in enterprise Java applications. By leveraging the Apache POI library, developers can generate Excel spreadsheets programmatically. This approach allows for dynamic column mapping using Java annotations and reflection, ensuring that the spreadsheet structure remains syn ...

Core Cache Annotations Spring Boot simplifies data caching through a declarative approach. To utilize the cache abstraction, ensure the @EnableCaching annotation is present on a configuration class. The framework manages storage based on method-level annotations. Retrieving Cached Results The @Cacheable annotation applies to read operations. Wh ...