SequenceDiagram plugin cannot resolve Spring interface implementations

[jfzhao]

When using the SequenceDiagram plugin to analyze a Spring Boot project, the plugin fails to resolve the relationship between interfaces and their implementations. For example, given the following code:

// IDemoService.java
public interface IDemoService {
    String sayHello(String name);
}

// DemoService.java
@Service
public class DemoService implements IDemoService {
    @Override
    public String sayHello(String name) {
        return "Hello, " + name + "!";
    }
}

// DemoCtrl.java
@RestController
public class DemoCtrl {
    @Autowired
    IDemoService demoService;

    public String sayHello(String name) {
        return demoService.sayHello(name);
    }
}

The plugin does not automatically associate IDemoService with its implementation DemoService, nor does it show the dependency injection in DemoCtrl.

Feature request:
Please enhance the plugin to support Spring's dependency injection and auto-wiring, so that it can automatically identify and display the relationships between interfaces and their implementations in Spring projects.

Thank you!

[Vanco]

which version of IntelliJ Idea Ultimate, SequenceDiagram Core, SequenceDiagram Java are you using?

I tested with

• IntelliJ Idea Ultimate 2025.2
• SequenceDiagram Core 4.0.5
• SequenceDiagram Java 4.0.5

result is:

[jfzhao]

Thanks for following up! I was using:

• IntelliJ IDEA Ultimate 2025.1.3
• SequenceDiagram Core 4.0.5
• SequenceDiagram Java 4.0.5

Funny thing – when I retested today, it worked perfectly. I didn’t record the exact versions when the issue happened, but everything seems fixed now. My best guess is a recent plugin update likely resolved it.

If I notice any weird behavior again, I’ll share details. Really appreciate you checking in!