PlantUML

About

PlantUML is a tool that allows users to define UML diagrams using a plain text description. It generates visual diagrams from these descriptions, making it a preferred choice for software developers and documentation writers.

Features

• Text-Based UML: Diagrams are written in plain text and converted into images.

• Supports Multiple UML Diagrams: Class, Sequence, Use Case, State, Activity, and more.

• Integration with Code and Documentation: Works with Markdown, AsciiDoc, LaTeX, etc.

• Automation and Version Control: Easy to track changes in diagrams using Git.

• Cross-Platform: Works on Windows, macOS, and Linux.

• Lightweight and Fast: Requires minimal system resources.

Installation and Setup

PlantUML requires Java (JDK 8 or higher) to run. It can be used in different ways:

Option 1: Using the Standalone JAR File

1. Install Java (if not installed).

2. Download the PlantUML JAR file from PlantUML’s official site.

3. Run it using:

   java -jar plantuml.jar your-diagram.puml

Option 2: Using Online Editors

• PlantUML Online Server

• Kroki.io (supports multiple diagram types)

Option 3: Using VS Code Plugin

1. Install the PlantUML extension from the VS Code marketplace.

2. Install Graphviz (needed for rendering):

   sudo apt install graphviz  # Linux
   brew install graphviz      # macOS

3. Create a .puml file and start writing UML diagrams!

Option 4: Using IntelliJ IDEA Plugin

• Install the PlantUML Integration plugin from the IntelliJ Plugin Marketplace.

Create a New PlantUML File

1. Open IntelliJ IDEA project.

2. Right-click on the src or desired directory.

3. Select New → File.

4. Name the file diagram.puml (or any .puml extension).

UML Diagrams Supported in PlantUML

PlantUML supports almost all major UML diagram types:

Refer to the official diagram for more details on the supported type - https://plantuml.com/

Diagram Type	Description	Example Syntax
Class Diagram	Represents classes and their relationships	class User { +name: String }
Sequence Diagram	Shows interaction between objects over time	Alice -> Bob: Hello
Use Case Diagram	Represents system functionalities and user interactions	User -> (Login)
Activity Diagram	Models workflows and decision-making	start --> if (Condition?) then
State Diagram	Shows state transitions in a system	[*] --> Active
Component Diagram	Represents system components and dependencies	component Database
Deployment Diagram	Shows hardware and software deployment	node Server { component App }
Object Diagram	Represents instances of classes at runtime	object user1: User