How to build project-wide UML diagram in IntelliJ IDEA?

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Right click on your package no matter which. Click Diagrams > Show Diagram (Ctrl+Alt+Shift+U). You will see your package in diagram editor.

Now:

  • You can expand (E) or collapse (C) all nodes.
  • You can show dependencies
  • You can show many attributes of nodes (constructors, methods, properties…)
  • You can drag&drop other packages from project explorer.

So, play with it a bit and I think you will achieve what you need.

This is how it could look like:
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