Visualizing Java Servlet Inheritance Hierarchy with IntelliJ IDEA Diagrams

When you want to see the inheritance chain of a class in IntelliJ IDEA, right‑click the class tab and choose Diagrams → Show (or Show … Popup for a floating window). The diagram will display inheritance (solid blue arrows) and interface implementation (dashed green arrows).

You can also right‑click a class in the project tree and select Diagrams to get the same view.

Optimizing the Diagram

To focus on relevant classes, select unwanted nodes (e.g., Object , Serializable ) and press the Delete key. The cleaned‑up diagram shows only the important Servlet hierarchy.

To inspect class details, right‑click the diagram and choose Show Categories , then expand properties, methods, constructors, etc. You can also use the toolbar button for the same action.

For visibility filtering, right‑click a method and select Change Visibility Level to show only members with the desired access level (e.g., protected and above).

Press Alt to activate the magnifier tool for zooming into the diagram when it appears too small.

Adding and Exploring Additional Classes

If you need to see relationships with other classes, right‑click the diagram and choose Add Class to Diagram , then type the class name. The new class will appear in the diagram, showing any connections.

To view the source code of a specific method, double‑click the class in the diagram, then right‑click the method and select Jump to Source . The Structure view can also be used to navigate quickly between methods.

Conclusion

Using these IntelliJ IDEA features makes it easy to study class relationships, explore framework source code, and understand inheritance structures, greatly improving the learning experience for Java backend developers.