OpenBSD: Building Java — how did it end?

I came back to the OpenBSD laptop this morning after what was supposed to be an all-night build of Java, which comes from OpenBSD's ports system and requires quite a bit of compiling and other voodoo.

So how did it end?

I don't have Java.

Sometime during the build, my /usr filesystem filled up. I set aside 6 gigabytes for /usr when I installed OpenBSD 4.4 on this laptop, and while I have a fair amount of software on the drive, I did have a fair amount of space left. Right now I'm doing a make clean and make clean=depends on the port, which is freeing up all that space, and I have 2.7 GB and counting.

That's not enough.

The OpenBSD FAQ does warn you to leave extra space in /usr if you're going to be building applications from ports instead of using packages (which I prefer in all instances where the package I need is available):

Compiling some ports from source can take huge amounts of space on your /usr and /tmp partitions. This is another reason we suggest using pre-compiled packages instead.

I've heard that building Java requires a lot of space. I just didn't know how much. And I don't have it in this installation.

How do I feel about compiling applications from source? I've never been a big fan of it. But with proper coding, documentation and guidance, it can work.