RFR [8009637]: Some error messages are missing a space

[Ivan Gerasimov]

Hello!

It was reported that the error message in an exception is missing a space.
Grep found a couple of other places with the same misformatting.

Can I please have a review of the trivial fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8009637
WEBREV: http://cr.openjdk.java.net/~igerasim/8009637/0/webrev/

Sincerely yours,
Ivan