a2a-samples/samples/java /custom_java_impl

The instructions of the sample are misleading or incomplete
There are no mvn project inside the mentioned package java and the command  ../mvnw spring-boot:run in the sample  is generating an issue if I try to run inside custom_java_impl.

<img width="1368" height="285" alt="Image" src="https://github.com/user-attachments/assets/d20ce8e1-db18-42d9-bf67-f538cf8c6c04" />