Upgrade JDK version to 17

[sundargates]

Context

We want mantis to be on Java17. Unfortunately, this would require several gradle changes. So, the goal of this task is to make these changes and ensure the builds succeed.

[Adithya2907]

I think one of the reasons it fails for higher versions of JDK is the DatatypeConverter package. As this answer on StackOverflow explains:

The module javax.xml.bind has been put outside the jdk as of Java 9.

Also, as part of the donation of Java EE to the Eclipse Foundation, its new name is Jakarta EE and accordingly the namespace was renamed to Jakarta. So you have to make the following modifications :

[sundargates]

@Adithya2907 would you like to pick this up?

[Adithya2907]

Yeah, sure I'd like to pick this up.

[cypherean]

Hey @Adithya2907
Are you working on this?

[Adithya2907]

Hi @cypherean , yes, I'm working on this. I've been trying to understand the codebase till now, and now I'll be migrating it to JDK 17. I'm seeing which all packages and libraries are failing due to the migration first