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+# WxJava - WeChat Java SDK Development Instructions
+
+WxJava is a comprehensive WeChat Java SDK supporting multiple WeChat platforms including Official Accounts (公众号), Mini Programs (小程序), WeChat Pay (微信支付), Enterprise WeChat (企业微信), Open Platform (开放平台), and Channel/Video (视频号). This is a Maven multi-module project with Spring Boot and Solon framework integrations.
+
+**ALWAYS reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the information here.**
+
+## Working Effectively
+
+### Prerequisites and Environment Setup
+- **Java Requirements**: JDK 8+ required (project uses Java 8 as minimum target)
+- **Maven**: Maven 3.6+ recommended (Maven 3.9.11 validated)
+- **IDE**: IntelliJ IDEA recommended (project optimized for IDEA)
+
+### Bootstrap, Build, and Validate
+Execute these commands in sequence after cloning:
+
+```bash
+# 1. Basic compilation (NEVER CANCEL - takes 4-5 minutes)
+mvn clean compile -DskipTests=true --no-transfer-progress
+# Timeout: Set 8+ minutes. Actual time: ~4 minutes
+
+# 2. Full package build (NEVER CANCEL - takes 2-3 minutes)  
+mvn clean package -DskipTests=true --no-transfer-progress
+# Timeout: Set 5+ minutes. Actual time: ~2 minutes
+
+# 3. Code quality validation (NEVER CANCEL - takes 45-60 seconds)
+mvn checkstyle:check --no-transfer-progress
+# Timeout: Set 3+ minutes. Actual time: ~50 seconds
+```
+
+**CRITICAL TIMING NOTES:**
+- **NEVER CANCEL** any Maven build command
+- Compilation phase takes longest (~4 minutes) due to 34 modules
+- Full builds are faster on subsequent runs due to incremental compilation
+- Always use `--no-transfer-progress` to reduce log noise
+
+### Testing Structure
+- **Test Framework**: TestNG (not JUnit)
+- **Test Files**: 298 test files across all modules  
+- **Default Behavior**: Tests are DISABLED by default in pom.xml (`<skip>true</skip>`)
+- **Test Configuration**: Tests require external WeChat API credentials via test-config.xml files
+- **DO NOT** attempt to run tests without proper WeChat API credentials as they will fail
+
+## Project Structure and Navigation
+
+### Core SDK Modules (Main Development Areas)
+- `weixin-java-common/` - Common utilities and base classes (most important)
+- `weixin-java-mp/` - WeChat Official Account SDK (公众号)
+- `weixin-java-pay/` - WeChat Pay SDK (微信支付) 
+- `weixin-java-miniapp/` - Mini Program SDK (小程序)
+- `weixin-java-cp/` - Enterprise WeChat SDK (企业微信)
+- `weixin-java-open/` - Open Platform SDK (开放平台)
+- `weixin-java-channel/` - Channel/Video SDK (视频号)
+- `weixin-java-qidian/` - Qidian SDK (企点)
+
+### Framework Integration Modules
+- `spring-boot-starters/` - Spring Boot auto-configuration starters
+- `solon-plugins/` - Solon framework plugins
+- `weixin-graal/` - GraalVM native image support
+
+### Configuration and Quality
+- `quality-checks/google_checks.xml` - Checkstyle configuration
+- `.editorconfig` - Code formatting rules (2 spaces = 1 tab)
+- `pom.xml` - Root Maven configuration
+
+## Development Workflow
+
+### Making Code Changes
+1. **Always build first** to establish clean baseline:
+   ```bash
+   mvn clean compile --no-transfer-progress
+   ```
+
+2. **Follow code style** (enforced by checkstyle):
+   - Use 2 spaces for indentation (not tabs)
+   - Follow Google Java Style Guide
+   - Install EditorConfig plugin in your IDE
+
+3. **Validate changes incrementally**:
+   ```bash
+   # After each change:
+   mvn compile --no-transfer-progress
+   mvn checkstyle:check --no-transfer-progress  
+   ```
+
+### Before Submitting Changes
+**ALWAYS run these validation steps in sequence:**
+
+1. **Code Style Validation**:
+   ```bash
+   mvn checkstyle:check --no-transfer-progress
+   # Must pass - takes ~50 seconds
+   ```
+
+2. **Full Clean Build**:
+   ```bash
+   mvn clean package -DskipTests=true --no-transfer-progress  
+   # Must succeed - takes ~2 minutes
+   ```
+
+3. **Documentation**: Update javadoc for public methods and classes
+4. **Contribution Guidelines**: Follow `CONTRIBUTING.md` - PRs must target `develop` branch
+
+## Module Dependencies and Build Order
+
+### Core Module Dependencies (Build Order)
+1. `weixin-graal` (GraalVM support)
+2. `weixin-java-common` (foundation for all other modules)
+3. Core SDK modules (mp, pay, miniapp, cp, open, channel, qidian)
+4. Framework integrations (spring-boot-starters, solon-plugins)
+
+### Key Relationship Patterns
+- All SDK modules depend on `weixin-java-common`
+- Spring Boot starters depend on corresponding SDK modules
+- Solon plugins follow same pattern as Spring Boot starters
+- Each module has both single and multi-account configurations
+
+## Common Tasks and Commands
+
+### Validate Specific Module
+```bash
+# Build single module (replace 'weixin-java-mp' with target module):
+cd weixin-java-mp
+mvn clean compile --no-transfer-progress
+```
+
+### Check Dependencies
+```bash
+# Analyze dependencies:
+mvn dependency:tree --no-transfer-progress
+
+# Check for dependency updates:  
+./others/check-dependency-updates.sh
+```
+
+### Release and Publishing
+```bash
+# Version check:
+mvn versions:display-property-updates --no-transfer-progress
+
+# Deploy (requires credentials):
+mvn clean deploy -P release --no-transfer-progress
+```
+
+## Important Files and Locations
+
+### Configuration Files
+- `pom.xml` - Root Maven configuration with dependency management
+- `quality-checks/google_checks.xml` - Checkstyle rules
+- `.editorconfig` - IDE formatting configuration
+- `.github/workflows/maven-publish.yml` - CI/CD pipeline
+
+### Documentation
+- `README.md` - Project overview and usage (Chinese)
+- `CONTRIBUTING.md` - Development contribution guidelines  
+- `demo.md` - Links to demo projects and examples
+- Each module has dedicated documentation and examples
+
+### Test Resources
+- `*/src/test/resources/test-config.sample.xml` - Template for test configuration
+- Tests require real WeChat API credentials to run
+
+## SDK Usage Patterns
+
+### Maven Dependency Usage
+```xml
+<dependency>
+  <groupId>com.github.binarywang</groupId>
+  <artifactId>weixin-java-mp</artifactId>  <!-- or other modules -->
+  <version>4.7.0</version>
+</dependency>
+```
+
+### Common Development Areas
+- **API Client Implementation**: Located in `*/service/impl/` directories
+- **Model Classes**: Located in `*/bean/` directories  
+- **Configuration**: Located in `*/config/` directories
+- **Utilities**: Located in `*/util/` directories in weixin-java-common
+
+## Troubleshooting
+
+### Build Issues
+- **OutOfMemoryError**: Increase Maven memory: `export MAVEN_OPTS="-Xmx2g"`
+- **Compilation Failures**: Usually dependency issues - run `mvn clean` first
+- **Checkstyle Failures**: Check `.editorconfig` settings in IDE
+
+### Common Gotchas
+- **Tests Always Skip**: This is normal - tests require WeChat API credentials
+- **Multi-Module Changes**: Always build from root, not individual modules
+- **Branch Target**: PRs must target `develop` branch, not `master`/`release`
+
+## Performance Notes
+- **First Build**: Takes 4-5 minutes due to dependency downloads
+- **Incremental Builds**: Much faster (~30-60 seconds)
+- **Checkstyle**: Runs quickly (~50 seconds) and should be run frequently
+- **IDE Performance**: Project uses Lombok - ensure annotation processing is enabled
+
+Remember: This is a SDK library project, not a runnable application. Changes should focus on API functionality, not application behavior.
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