After finishing the import of helloworld and kitchensink quickstarts, the user is prompted whether the cheat sheet for the project should be opened. Upon opening it, JBDS 9.0 and 9.1 produces the following error message:

An error has occurred. See error log for more details.
java.lang.NullPointerException

The detailed error log produces the same message.

The quickstarts and their cheat sheets work even after the prompt with NullPointerException message.