Install PlantUML and Java on Mac

✅ PART 1: Install Java

🔹 Step 1: Check Java

java -version

🔹 Step 2: Install Java

Option A (Homebrew):

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew install openjdk
sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
echo 'export PATH="/opt/homebrew/opt/openjdk/bin:$PATH"' >> ~/.zprofile
source ~/.zprofile

Option B (Oracle Installer):

Download from Oracle Java Downloads

🔹 Step 3: Verify

java -version

✅ PART 2: Install PlantUML

🔹 Step 1: Install Graphviz

brew install graphviz

🔹 Step 2: Install PlantUML

Option A: Download plantuml.jar from plantuml.com/download

Option B: Homebrew install:

brew install plantuml

✅ PART 3: Run PlantUML

🔹 Option A: Using JAR

java -jar ~/tools/plantuml/plantuml.jar test.puml

🔹 Option B: Using Homebrew version

plantuml test.puml

🔹 Option C: IDE Integration

Use PlantUML plugin for VS Code or IntelliJ, set path to plantuml.jar if needed.

✅ PART 4: Optional Alias

echo 'alias puml="java -jar ~/tools/plantuml/plantuml.jar"' >> ~/.zprofile
source ~/.zprofile

🧠 Troubleshooting

Problem	Fix
java: command not found	Install Java, check PATH
Error: Could not find or load main class	Check JAR file path
Diagrams not rendering	Ensure Graphviz is installed (dot -V)

🎯 Summary

Task	Command / Action
Install Homebrew	See Part 1 Step 2
Install Java	brew install openjdk
Install Graphviz	brew install graphviz
Install PlantUML	brew install plantuml
Download JAR	plantuml.com/download
Run UML (JAR)	java -jar path/to/plantuml.jar file.puml
Run UML (brew)	plantuml file.puml