In describing how to unpack the binary plug for the OpenJDK it simply says:
you must first download and install one or more of the following
files from which the build process will copy over "binary plugs"
It would be clearer to explicitly say to run
java -jar ...
On the download.
The above text is copied from
This page is linked from openjdk.java.net .. the bundles link in the navbar area.
I'm sure the page is autogenerated during the staging process.
The README-builds.html has the same statement. It should be updated to say
whatever the download page says.