Implement Connectivity.java example using Java bindings

[vdhyasani17]

[WIP] This adds a Java version of the connectivity example using Open MPI's Java bindings. It demonstrates basic point-to-point communication and serves as a reference for Java-based MPI applications. The functionality will be the same as connectivity_c.c.

[github-actions]

Hello! The Git Commit Checker CI bot found a few problems with this PR:

a46c371: Create Connectivity.java and be able to compile/ru...

• check_signed_off: does not contain a valid Signed-off-by line

Please fix these problems and, if necessary, force-push new commits back up to the PR branch. Thanks!

[github-actions]

Hello! The Git Commit Checker CI bot found a few problems with this PR:

a46c371: Create Connectivity.java and be able to compile/ru...

• check_signed_off: does not contain a valid Signed-off-by line

Please fix these problems and, if necessary, force-push new commits back up to the PR branch. Thanks!

[github-actions]

Hello! The Git Commit Checker CI bot found a few problems with this PR:

a46c371: Create Connectivity.java and be able to compile/ru...

• check_signed_off: does not contain a valid Signed-off-by line

Please fix these problems and, if necessary, force-push new commits back up to the PR branch. Thanks!

[vdhyasani17]

Hi @jsquyres, can you review my PR when you have the chance? Thank you!

[jsquyres]

I'm not quite sure how the extra mpi.h.in / python changes came into this PR. Can you rebase to the current tip of main and avoid including Howard's commit here?

[vdhyasani17]

Sorry, I had some issues with rebasing, so all of my commits are now underneath the comments.

[jsquyres]

Sorry, I had some issues with rebasing, so all of my commits are now underneath the comments.

Rebasing is no problem -- I slice and dice my commits via interactive rebasing all the time. 😄

[jsquyres]

Go ahead and resolve the github conversations that you have addressed -- makes it easier to see what has been done.

Also, can you squash your Java commits down to a single commit? When we merge this PR, we probably only need to see a single commit in the final git history showing the addition of this example. Thanks!

[jsquyres]

You might want to edit your commit message -- it's currently showing as 3 commit messages in one.

It also shows that Luke was the author..? I don't think you want that.

There's also unrelated changes in the commit. Did you end up squashing Luke's commits into yours?

[vdhyasani17]

Ok, by showing three commit messages, do you mean that it's showing 'signoff: Vasista Dhyasani' three times?

[jsquyres]

It also shows that Luke was the author..? I don't think you want that.

There's also unrelated changes in the commit. Did you end up squashing Luke's commits into yours?

In the commit message, yes.

But it also shows that Luke was the author..? I don't think you want that.

There's also unrelated changes in the commit. Did you end up squashing Luke's commits into yours?

[jsquyres]

To be clear: your commit message currently shows this:

Create Connectivity.java and be able to compile/run java files

Signed-off-by: vdhyasani17 vasi.dhyasani@gmail.com

Implement the code for Connectivity.java

Add comments to explain the functionality

Signed-off-by: vdhyasani17 vasi.dhyasani@gmail.com

Make communication non-blocking by using iSend and iRecv

Fix comment semantics and structure

Add -v verbose check

Signed-off-by: vdhyasani17 vasi.dhyasani@gmail.com

Change nonblocking iSend/iRecv to sendRecv operation

Signed-off-by: vdhyasani17 vasi.dhyasani@gmail.com

The commit also contains changes for coll/han and coll/tuned. I think that those changes were included by mistake, and somehow squashed into your commit.

Your commit should just for for this Java change, and the commit message can be just a single description of your Java example program.

[vdhyasani17]

Ok, so I should just have one commit message (not a combination of commits) that summarizes what I've been doing, and change the author to me?

[jsquyres]

Ok, so I should just have one commit message (not a combination of commits) that summarizes what I've been doing, and change the author to me?

Correct -- and make sure to remove the coll/tuned coll/han changes; this commit should just be the Java example. Squashing it down to one commit means that there's just one message for the git history; so you can just describe the end state of that commit (i.e., adding this Java example program).

Oh, I just realized: you need to add this example to the examples/Makefile, too, right?