No problem.
So, if you haven’t, go to Oracle’s website and download Java SE Development Kit 8u151 for Linux ARM 32 Hard Float ABI. You should get a file named jdk-8u151-linux-arm32-vfp-hflt.tar.gz in your Downloads folder.
When it’s done, go in the /usr/java you’ve created previously and unpack the archive:
cd /usr/java
sudo tar -xzf ~/Downloads/jdk-8u151-linux-arm32-vfp-hflt.tar.gz
You should then have a subfolder in /usr/share, (probably) named “jdk1.8.0_151”. Confirm that it’s the case before continuing.