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+# AWS Lambda Official Documentation Reference
+
+## Overview
+AWS Lambda is a compute service that runs code without the need to manage servers. Your code runs automatically, scaling up and down with pay-per-use pricing.
+
+## Common Use Cases
+- Stream processing: Process real-time data streams for analytics
+- Web applications: Build scalable web apps that automatically adjust
+- Mobile backends: Create secure API backends
+- IoT backends: Handle web, mobile, IoT, and third-party API requests
+- File processing: Process files automatically when uploaded
+- Database operations: Respond to database changes and automate data workflows
+- Scheduled tasks: Run automated operations on a regular schedule
+
+## How Lambda Works
+1. You write and organize your code in Lambda functions
+2. You control security through Lambda permissions using execution roles
+3. Event sources and AWS services trigger your Lambda functions
+4. Lambda runs your code with language-specific runtimes
+
+## Key Features
+
+### Configuration & Security
+- Environment variables modify behavior without deployments
+- Versions safely test new features while maintaining stable production
+- Lambda layers optimize code reuse across multiple functions
+- Code signing ensures only approved code reaches production
+
+### Performance
+- Concurrency controls manage responsiveness and resource utilization
+- Lambda SnapStart reduces cold start times to sub-second performance
+- Response streaming delivers large payloads incrementally
+- Container images package functions with complex dependencies
+
+### Integration
+- VPC networks secure sensitive resources and internal services
+- File system integration shares persistent data across function invocations
+- Function URLs create public APIs without additional services
+- Lambda extensions augment functions with monitoring and operational tools
+
+## AWS Lambda Java SDK API
+
+### Key Classes
+- `LambdaClient` - Synchronous service client
+- `LambdaAsyncClient` - Asynchronous service client
+- `LambdaClientBuilder` - Builder for synchronous client
+- `LambdaAsyncClientBuilder` - Builder for asynchronous client
+- `LambdaServiceClientConfiguration` - Client settings configuration
+
+### Related Packages
+- `software.amazon.awssdk.services.lambda.model` - API models
+- `software.amazon.awssdk.services.lambda.transform` - Request/response transformations
+- `software.amazon.awssdk.services.lambda.paginators` - Pagination utilities
+- `software.amazon.awssdk.services.lambda.waiters` - Waiter utilities
+
+### Authentication
+Lambda supports signature version 4 for API authentication.
+
+### CA Requirements
+Clients need to support these CAs:
+- Amazon Root CA 1
+- Starfield Services Root Certificate Authority - G2
+- Starfield Class 2 Certification Authority
+
+## Core API Operations
+
+### Function Management Operations
+- `CreateFunction` - Create new Lambda function
+- `DeleteFunction` - Delete existing function
+- `GetFunction` - Retrieve function configuration
+- `UpdateFunctionCode` - Update function code
+- `UpdateFunctionConfiguration` - Update function settings
+- `ListFunctions` - List functions for account
+
+### Invocation Operations
+- `Invoke` - Invoke Lambda function synchronously
+- `Invoke` with `InvocationType.EVENT` - Asynchronous invocation
+
+### Environment & Configuration
+- Environment variable management
+- Function configuration updates
+- Version and alias management
+- Layer management
+
+## Examples Overview
+The AWS documentation includes examples for:
+- Basic Lambda function creation and invocation
+- Function configuration and updates
+- Environment variable management
+- Function listing and cleanup
+- Integration patterns
+
+## Best Practices from Official Docs
+- Reuse Lambda clients across invocations
+- Set appropriate timeouts matching function requirements
+- Use async invocation for fire-and-forget scenarios
+- Implement proper error handling for function errors and status codes
+- Use environment variables for configuration management
+- Version functions for production stability
+- Monitor invocations using CloudWatch metrics
+- Implement retry logic for transient failures
+- Use VPC integration for private resources
+- Optimize payload sizes for performance
+
+## Security Considerations
+- Use IAM roles with least privilege
+- Implement proper Lambda permissions
+- Use environment variables for sensitive data
+- Enable CloudTrail logging
+- Monitor security events with CloudWatch
+- Use code signing for production deployments
+- Implement proper authentication and authorization