Beginning Helidon: Building Cloud-Native Microservices and Applications

Table of Contents
About the Authors
About the Technical Reviewers
Introduction
Preface
Chapter 1: Introduction
	Introducing Helidon
	Helidon Flavors
		Helidon MP
		Helidon SE
		Which Flavor Should You Use?
	Summary
Chapter 2: Your First Application
	Generating Your First Application
		Helidon CLI
		Project Starter
		Helidon Maven Archetypes
	Analyzing Generated Project
		Quickstart Application
		Maven Project
		CDI
		RESTful Web Service
	Build and Run
	Packaging
		Executable JAR
		jlink Image
		Native Image
			Local Native Image Build
			Docker Native Image Build
	Deploying to Kubernetes
	Summary
Chapter 3: Configuration
	Expressions
	Programmatic API
	Config Sources
	Converters
		Automatic Converter
	Aggregated Properties
		Custom Converter
	Profiles
		Property Level
		Config Source Level
	Meta Configuration
	YAML Config Source
	Custom Config Source
	Dynamic Config Source
	Kubernetes ConfigMap
		Environment Variables
		Mounted Volume
	Summary
Chapter 4: Observability
	What Is Observability?
	Health
		Kubernetes Probes
		MicroProfile Health
		Adding Health Checks to Your Helidon Application
			Using Project Starter
			Using CLI
			Adding Dependencies Manually
		Built-in Checks
		Custom Checks
	Metrics
		Adding MicroProfile Metrics Support to Your Helidon Application
			Using Project Starter
			Using CLI
			Adding Dependencies Manually
		Sample Application
		MicroProfile Metrics REST API
		Metrics Model
			Metric Identity
			Metric Scopes
				Base Scope
				Vendor Scope
				Application Scope
			Metric Metadata
			Metrics Types
		Using MicroProfile Metrics API
			Counter
				Using Annotations
				Using Programmatic API
			Gauge
				Using Annotations
				Using Programmatic APIs
			Concurrent Gauge
				Using Annotations
				Using Programmatic API
			Histogram
				Using Programmatic API
			Meter
				Using Annotations
				Using Programmatic APIs
			Simple Timer
				Using Annotations
				Using Programmatic API
			Timer
				Using Annotations
				Using Programmatic API
	Tracing
		Distributed Tracing
		Adding Tracing to Your Helidon Application
			Using Project Starter
			Using CLI
			Adding Dependencies Manually
		Helidon Tracing Implementation
			Helidon Built-in Spans
		MicroProfile OpenTracing API
		Configuration
			Enabling/Disabling Tracing
			Renaming a Top-Level Span
	Logging
		Logging in Helidon
			Mapped Diagnostic Context (MDC)
				MDC with JUL
				MDC with Log4j
				MDC with SLF4J
	Summary
Chapter 5: Communicating with Other Services
	MicroProfile Rest Client
		Integration with MicroProfile Config
		Exception Handling
		Modifying Requests and Responses
		Handling Headers
		Asynchronous Operations
		Programmatic APIs
		MicroProfile Rest Client Conclusion
	JAX-RS Client API
		Providers
		Asynchronous Operations
		JAX-RS Client API Conclusion
	CORS
	Summary
Chapter 6: Accessing Data
	Low-Level Data Access with JDBC
	Working with DataSource
	Data Access with JPA
		Transactions
	Summary
Chapter 7: Resiliency
	Retry
	Fallback
	Asynchronous
	Timeout
	Circuit Breaker
	Bulkhead
	Fault Tolerance and CDI
	Summary
Chapter 8: Security
	Serving HTTPS
	Helidon Security
	Basic Authentication
	JSON Web Token
	MicroProfile JWT RBAC
	OpenID Connect
	Token Propagation
	Configuration of Secrets
		AES-GCM Encryption
		RSA Encryption
		Plain Text Password Detection
	Summary
Chapter 9: Using OpenAPI
	About OpenAPI
	Basic Usage
		Static OpenAPI Files
	Automatic Client Generation
	Summary
Chapter 10: Testing Your Helidon Application
	Testing in Helidon
	Testing with JUnit 5
		Advanced Usage
	Testing with TestNG
	Work with Testcontainers
		The Other Way Around
	Summary
Chapter 11: Scheduling Tasks
	Scheduling in Helidon
	Simple Scheduling in Helidon
	Scheduling in Kubernetes
	Summary
Chapter 12: Integration with Other Technologies
	Neo4j
		Enabling Metrics and Health Checks
	Coherence
		Integrating with Helidon
	Verrazzano
		Deploying the Helidon Wizard Application
	Summary
Chapter 13: Going Reactive
	Reactive Streams
	Reactive Operators
		Marble Diagrams
	MicroProfile Reactive Streams Operators
		of
		empty
		failed
		generate
		iterate
		fromCompletionStage
		fromCompletionStageNullable
		fromPublisher
		concat
		map
		peek
		filter
		limit
		takeWhile
		dropWhile
		skip
		flatMap
		flatMapCompletionStage
		flatMapIterable
		onComplete
		onError
		onErrorResume
		onErrorResumeWith
		onTerminate
		cancel
		reduce
		distinct
		findFirst
		forEach
		ignore
		toList
		to
		via
	Helidon Reactive Operators
	Reactive Messaging
		Channel
		Emitter
		Message
		Acknowledgment
		No Acknowledgment
		Messaging Health
	Messaging Connectors
	Kafka Connector
		Nack Strategies
	JMS Connector
		Injected ConnectionFactory
		Lookup ConnectionFactory over JNDI
		Destination
		Message
		javax vs. jakarta JMS
	WebLogic JMS Connector
		WebLogic Destination CDI Syntax
			Non-Distributed Destinations
			Uniform Distributed Destinations (UDDs)
		JNDI Destination
	Oracle AQ Connector
		Single Consumer Queue
		Multi-Consumer Queue
	Mock Connector
	Summary
Chapter 14: Long Running Actions (LRA)
	LRA Transaction
	Context Propagation
	Participant
		Complete
		Compensate
		Status
		Forget
		AfterLRA
		Leaving LRA
	Non-JAX-RS Participant Methods
	Asynchronous Compensation
	LRA Coordinator
		Narayana LRA Coordinator
		MicroTx
		Experimental Helidon LRA Coordinator
	Online Cinema Booking System
	Summary
Chapter 15: Helidon SE
	Helidon SE Basics
	Generating Helidon SE Application
		Using Project Starter
		Using CLI
	Analyzing the Generated Project
		Main Method
		Creating and Starting a Web Server
		Configuration
		Routing
		RESTful Services
		Health Checks
		Metrics
		Building and Packaging
	Other Helidon SE Features
	Summary
Index