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+# GitHub Copilot Instructions for xAPI Java
+
+## Project Overview
+
+xAPI Java is a library that helps you create applications that send or receive xAPI Statements or Documents. This is a Maven-based monorepo containing multiple projects:
+
+- **xapi-model**: Core data models for xAPI statements, actors, verbs, activities, and related objects
+- **xapi-client**: Client library for communicating with Learning Record Stores (LRS)
+- **xapi-model-spring-boot-starter**: Spring Boot autoconfiguration for xAPI model validation
+- **samples**: Example applications demonstrating xAPI client usage
+
+## Technology Stack
+
+- **Language**: Java 17 or newer (required)
+- **Build Tool**: Maven (using Maven Wrapper `./mvnw`)
+- **Framework**: Spring Boot 3.5.7, Spring WebClient (reactive)
+- **Code Style**: Google Java Style Guide enforced via CheckStyle
+- **Testing**: JUnit 5 (Jupiter), Hamcrest matchers
+- **Code Generation**: Lombok (with specific configurations)
+- **Validation**: Jakarta Bean Validation
+- **Serialization**: Jackson (with custom modules for strict xAPI compliance)
+
+## Building and Testing
+
+### Build Commands
+
+```bash
+# Clean build with tests
+./mvnw clean verify
+
+# Build without tests
+./mvnw clean verify -DskipTests
+
+# Run tests only
+./mvnw test
+
+# Run integration tests
+./mvnw verify
+```
+
+### Before Making Changes
+
+Always run the full build before starting work to ensure you understand the current state:
+
+```bash
+./mvnw clean verify
+```
+
+## Code Style and Quality
+
+### Style Guide
+
+- **Strictly follow the Google Java Style Guide**
+- CheckStyle is configured and enforced in the build
+- Code is automatically scanned with SonarCloud
+- CodeQL performs security vulnerability scanning
+
+### Validation
+
+- CheckStyle validation runs automatically during Maven build
+- Over 300 unit tests ensure xAPI specification conformance
+- Sonar performs automatic pull request reviews
+
+## Development Guidelines
+
+### Immutability and Fluent Interface
+
+All xAPI model objects are **immutable** and use a **fluent interface** pattern:
+
+```java
+Statement statement = Statement.builder()
+    .agentActor(a -> a.name("A N Other").mbox("mailto:another@example.com"))
+    .verb(Verb.ATTEMPTED)
+    .activityObject(o -> o.id("https://example.com/activity/simplestatement")
+        .definition(d -> d.addName(Locale.ENGLISH, "Simple Statement")))
+    .build();
+```
+
+### Creating Modified Versions
+
+Use `toBuilder()` to create modified versions of immutable objects:
+
+```java
+Statement completedStatement = attemptedStatement.toBuilder()
+    .verb(Verb.COMPLETED)
+    .build();
+```
+
+### Lombok Usage
+
+- All model classes use Lombok for reducing boilerplate
+- Common annotations: `@Builder`, `@Value`, `@Getter`, `@With`
+- Lombok config is set in `lombok.config` files
+- Constructor properties are added for deserialization compatibility
+
+### Validation
+
+Models use Jakarta Bean Validation annotations:
+
+- `@NotNull` for required fields
+- Custom validators in `dev.learning.xapi.model.validation.constraints`
+- Validation can be programmatically executed or automatic in Spring controllers with `@Valid`
+
+### Jackson Serialization
+
+Custom Jackson modules provide strict xAPI compliance:
+
+- `XapiStrictLocaleModule`: Validates locale formats
+- `XapiStrictNullValuesModule`: Handles null value validation
+- `XapiStrictObjectTypeModule`: Validates objectType fields
+- `XapiStrictTimestampModule`: Validates timestamp formats
+
+## Testing Conventions
+
+### Test Structure
+
+- Tests use JUnit 5 (`@Test`, `@DisplayName`)
+- Hamcrest matchers for assertions (`assertThat`, `is`, `notNullValue`, etc.)
+- JSON path matchers for verifying serialization: `hasJsonPath`, `hasNoJsonPath`
+
+### Example Test Pattern
+
+```java
+@Test
+@DisplayName("When Statement Has All Properties Then Serialization Works")
+void testStatementSerialization() throws JsonProcessingException {
+    Statement statement = Statement.builder()
+        .agentActor(a -> a.name("Test User").mbox("mailto:test@example.com"))
+        .verb(Verb.COMPLETED)
+        .activityObject(o -> o.id("https://example.com/activity/1"))
+        .build();
+
+    String json = objectMapper.writeValueAsString(statement);
+
+    assertThat(json, hasJsonPath("$.actor.name", is("Test User")));
+    assertThat(json, hasJsonPath("$.verb.id"));
+}
+```
+
+### Test Coverage
+
+- Comprehensive unit tests for all model classes
+- Integration tests for client functionality
+- Tests verify xAPI specification compliance
+- Use MockWebServer (OkHttp) for testing HTTP interactions in xapi-client
+
+## Module-Specific Guidelines
+
+### xapi-model
+
+- Contains all xAPI data model classes (Statement, Actor, Verb, Activity, etc.)
+- All classes are immutable with builder pattern
+- Extensive validation annotations
+- Custom validators for xAPI-specific rules
+- Located in `xapi-model/src/main/java/dev/learning/xapi/model/`
+
+### xapi-client
+
+- Spring WebClient-based reactive client
+- Implements xAPI Statement, State, Agent Profile, and Activity Profile resources
+- Auto-configuration via Spring Boot
+- Uses fluent request builders
+- Located in `xapi-client/src/main/java/dev/learning/xapi/client/`
+
+### xapi-model-spring-boot-starter
+
+- Provides Spring Boot autoconfiguration
+- Configurable validation rules via properties (prefix: `xapi.model.`)
+- All validation rules default to TRUE (strict mode)
+- Located in `xapi-model-spring-boot-starter/src/main/java/`
+
+### samples
+
+- Example applications demonstrating client usage
+- Each sample shows a specific xAPI operation
+- Use samples as reference for common patterns
+- Located in `samples/` directory
+
+## Common Patterns
+
+### Creating Agents
+
+```java
+Agent agent = Agent.builder()
+    .name("John Doe")
+    .mbox("mailto:john.doe@example.com")
+    .build();
+```
+
+### Creating Groups
+
+```java
+Group group = Group.builder()
+    .name("Team A")
+    .addMember(m -> m.name("Member 1").mbox("mailto:member1@example.com"))
+    .addMember(m -> m.name("Member 2").mbox("mailto:member2@example.com"))
+    .build();
+```
+
+### Using Language Maps
+
+```java
+LanguageMap names = LanguageMap.builder()
+    .addEntry(Locale.ENGLISH, "English Name")
+    .addEntry(Locale.FRENCH, "Nom Français")
+    .build();
+```
+
+## Important Constraints
+
+### xAPI Specification Compliance
+
+- All data must conform to the xAPI specification
+- IRI/URI fields must include schemes (e.g., `https://`, `mailto:`)
+- Timestamps follow ISO 8601 format
+- UUIDs must be variant 4
+- Score values have specific ranges (-1 to 1 for scaled scores)
+- Voided statements must reference other statements
+
+### Memory Limits
+
+When working with xapi-client:
+
+- Default Spring WebClient buffer limit: 256KB
+- May need to increase for large statement sets or attachments
+- Configure via `spring.codec.max-in-memory-size` property
+
+## CI/CD
+
+### GitHub Actions Workflows
+
+- **maven_push.yml**: Runs on push to main (build, test, Sonar scan)
+- **maven_pull_request.yml**: Runs on PRs (build, test, conditional Sonar scan)
+- **codeql.yml**: Security scanning
+- **maven-publish.yml**: Maven Central publishing
+
+### Quality Gates
+
+- All builds must pass CheckStyle validation
+- All tests must pass
+- SonarCloud quality gate must pass
+- CodeQL security checks must pass
+
+## Copyright and Licensing
+
+- All source files include copyright header: `Copyright 2016-2025 Berry Cloud Ltd. All rights reserved.`
+- Project is licensed under Apache License 2.0
+- Maintain copyright headers when creating new files
+
+## Tips for Effective Contributions
+
+1. **Read the xAPI specification** when working with model classes
+2. **Use existing patterns** - the codebase has consistent patterns for builders, validation, and testing
+3. **Write tests first** - the project has excellent test coverage, maintain it
+4. **Keep immutability** - never add mutable state to model objects
+5. **Follow fluent patterns** - builders should support method chaining
+6. **Validate strictly** - default to strict xAPI compliance unless explicitly configured otherwise
+7. **Document public APIs** - use JavaDoc for public methods and classes
+8. **Check samples** - refer to sample applications for usage patterns
+
+## Getting Help
+
+- README.md contains detailed usage examples
+- Each module has comprehensive JavaDoc
+- Samples folder demonstrates common use cases
+- xAPI specification: https://github.com/adlnet/xAPI-Spec