[📑 Docs]: Rewrite “Creating a template – Java” tutorial to use AsyncAPI v3

[Harsh16gupta]

What Dev Docs changes are you proposing?

Update the “Creating a template – Java” tutorial to use AsyncAPI v3 instead of v2.
https://www.asyncapi.com/docs/tools/generator/generator-template-java

To align with the latest specification:

• The AsyncAPI document used in the tutorial needs to be updated to v3
• Generator template code must be updated to use the v3 parser API

A similar update was already done for the Python tutorial in #1826.

This ensures consistency with other language tutorials and prevents users from learning deprecated patterns.

Code of Conduct

• I agree to follow this project's Code of Conduct

Are you willing to work on this issue ?

Yes I am willing to submit a PR!

[Harsh16gupta]

@derberg @Adi-204 I worked on #1826 and would be happy to take this up as well, if you’re okay with it.

[GaneshPatil7517]

hey @Harsh16gupta i want to work on this can you assign this to me.....

[Harsh16gupta]

Hey @GaneshPatil7517
Thanks for your interest in this! I’ve already worked on a similar update for the Python tutorial in #1826 and opened this issue with the intent to take it up as well.

Also, just to clarify, I’m not a maintainer, so I can’t assign the issue to anyone. If maintainers decide otherwise or collaboration is needed, we can coordinate then.

[Adi-204]

Hey @Harsh16gupta you can pick up this issue, if you are interested. I would recommend once #1826 is merge create PR for this one a lot easier to review.

[derberg]

@Harsh16gupta you can pick it up