AdoptOpenJDK as Astah's JRE
Due to Oracle's end of public support of Java8 for commercial users, we've changed the bundled JRE for Astah to AdoptOpenJDK.
If your company security policy does not allow a use of app with un-supported JRE, update to version 8.1, then you will be all set.
Update to Ver8.1
What's new in Ver8.1