Groovy Programming Training Course

Introduction to Groovy

• Overview of Apache Groovy
• History and evolution of the language
• Relationship between Groovy and the Java Virtual Machine
• Groovy as both a scripting and general-purpose programming language
• Common use cases for Groovy
• Implementing Groovy in Java-based projects
• Benefits of using Groovy alongside Java
• Introduction to the sample application

Overview of Groovy Features

• Dynamic typing and optional static typing
• Scripting capabilities
• Concise syntax and language enhancements
• Closures and functional programming concepts
• Groovy collections and enhanced APIs
• Operator overloading
• String interpolation
• Safe navigation and Elvis operators
• Developing Domain-Specific Languages
• Meta-programming capabilities
• The Groovy Development Kit (GDK)

Setting up the Development Environment

• Installing and configuring Groovy
• Working with various Groovy distributions
• Executing Groovy scripts from the command line
• Running Groovy applications
• Setting up an Integrated Development Environment (IDE)
• Creating a new Groovy project
• Managing project dependencies
• Integrating Groovy into existing Java projects
• Configuring the environment for containerized applications

Writing Your First Groovy Application

• Creating a basic Groovy script
• Understanding script structure and layout
• Executing Groovy applications
• Utilizing the println statement for output
• Working with variables
• Defining methods
• Adding comments and documentation
• Constructing a simple sample application
• Compiling Groovy code

Getting Familiar with Groovy's Syntax

• Groovy statements and expressions
• Semicolons and optional syntax elements
• Variables and constants
• Dynamic and explicit typing mechanisms
• String literals and interpolation techniques
• Handling single-line and multi-line strings
• Operators and complex expressions
• Groovy-specific operators and shortcuts
• Null handling strategies
• Safe navigation operators
• The Elvis operator
• Multiple assignment operations

Using Groovy's Data Types and Collections

• Primitive and object data types
• Number types and numeric operations
• String and character handling
• Boolean logic
• Date and time-related values
• Lists and their usage
• Maps and key-value pairs
• Sets for unique elements
• Ranges and their applications
• Iterating over collection structures
• Transforming collection data
• Filtering and searching within collections
• Sorting and grouping data
• Core Groovy collection methods

Using Groovy Closures

• Concepts and usage of closures
• Closure syntax and structure
• Defining closure parameters
• Implicit closure parameters
• Invoking closures
• Storing closures in variables
• Passing closures as method arguments
• Returning closures from methods
• Utilizing closures with collections
• Filtering and transforming data using closures
• Scope management and variable capture
• Applying closures in functional programming
• Practical patterns for closure usage

Controlling Program Flow with Groovy Control Structures

• Conditional logic structures
• Using if and else statements
• Nesting conditions
• Utilizing switch statements
• Loops and iterative processes
• Using for, while, and do-while loops
• Incorporating ranges in loops
• Using closures for iteration tasks
• Controlling loop execution with break and continue
• Exception handling mechanisms
• Utilizing try, catch, and finally blocks
• Throwing custom exceptions
• Groovy-specific features for controlling flow

Implementing Object Oriented Programming (OOP) in Your Application

• Defining classes in Groovy
• Managing properties and fields
• Defining constructors
• Implementing methods
• Applying encapsulation
• Inheritance principles
• Working with interfaces
• Using abstract classes
• Implementing polymorphism
• Method overriding techniques
• Method overloading capabilities
• Groovy getters and setters
• Leveraging traits
• Defining Enums
• Creating domain models for the sample application

Runtime MetaProgramming and Compile Time MetaProgramming

• Introduction to Groovy meta-programming
• Dynamic method invocation techniques
• Using Expando objects
• Manipulating methods and properties at runtime
• Utilizing Categories and extensions
• Understanding the MetaClass
• Dynamically adding methods
• Intercepting method calls
• Applying compile-time transformations
• Common Abstract Syntax Tree (AST) transformations
• Best practices for responsible meta-programming
• Practical examples of meta-programming

Working with Builders

• Introduction to the builder pattern
• Purpose and usage of Groovy builders
• Creating hierarchical data structures
• Generating XML content
• Generating JSON content
• Creating HTML and markup
• Configuring builder output formats
• Integrating closures with builders
• Developing custom builder classes
• Applying builders in Domain-Specific Language development

Accessing a Database with Groovy

• Core concepts of database connectivity
• Connecting Groovy applications to database systems
• Utilizing JDBC and Groovy database APIs
• Configuring database connection parameters
• Executing SQL queries
• Processing and reading query results
• Performing insert, update, and delete operations
• Implementing parameterized queries for security
• Managing database transactions
• Handling database-specific exceptions
• Working with Groovy SQL utilities
• Building database functionality for the sample application

Calling Java from Groovy

• Understanding Groovy and Java interoperability
• Accessing Java classes within Groovy
• Invoking Java methods
• Utilizing external Java libraries
• Working with Java collection frameworks
• Handling Java exceptions in Groovy
• Comparing Groovy and Java syntax
• Calling Groovy code from Java environments
• Mixing Groovy and Java source files
• Integrating Groovy into existing Java applications
• Best practices for language interoperability

Connecting to REST Services and Applications

• Introduction to RESTful APIs
• HTTP concepts relevant to Groovy applications
• Sending HTTP requests
• Handling GET, POST, PUT, and DELETE operations
• Managing request parameters and headers
• Processing JSON response data
• Constructing JSON request bodies
• Implementing authentication mechanisms
• Managing HTTP error responses
• Consuming external REST services
• Integrating REST functionality into the sample application

Working with the GDK

• Introduction to the Groovy Development Kit
• Leveraging enhanced Java APIs
• Advanced string manipulation
• Utilizing enhanced collection features
• Performing file and directory operations
• Reading from and writing to files
• Handling input and output streams
• Processing XML data
• Processing JSON data
• Managing dates and time values
• Using utility methods and convenience APIs
• Selecting appropriate GDK tools for specific tasks

Unit Testing a Groovy Application

• Introduction to testing Groovy applications
• Concepts of test-driven development
• Writing effective unit tests
• Utilizing popular testing frameworks
• Structuring test classes and methods
• Using assertions to validate logic
• Testing class and method behaviors
• Testing closure implementations
• Testing exception handling
• Mocking external dependencies
• Implementing data-driven testing strategies
• Testing database-related functionalities
• Testing REST service integrations
• Running tests and analyzing results

Troubleshooting

• Diagnosing and fixing Groovy syntax errors
• Debugging runtime issues
• Resolving compilation problems
• Troubleshooting Java interoperability challenges
• Debugging closure and collection operations
• Investigating database connectivity issues
• Resolving REST API integration errors
• Debugging meta-programming behaviors
• Utilizing logging and diagnostic tools
• Practical troubleshooting exercises

Summary and Conclusion

• Review of Groovy language fundamentals
• Recap of syntax, data types, and collections
• Summary of closures and functional programming concepts
• Review of object-oriented programming principles
• Recap of meta-programming and builder patterns
• Review of database and REST integration techniques
• Summary of Groovy and Java interoperability
• Review of GDK capabilities and utilities
• Recap of testing best practices
• Best practices for developing robust Groovy applications
• Final comprehensive hands-on exercise
• Q&A and discussion session