In KeyTab.java, if DEBUG is true, then System.out is written to.

In the readServiceKeys method (at about line 303), there is the following code:

System.out.println("Added key: " + entry.keyType +
    "version: " + entry.keyVersion);

However, the string "version: " is missing a leading space, so output looks like this:

Added key: 17version: 1
Added key: 18version: 1

Suggest a space is added to improve output readability. Change "version: " to " version: ".

Source: https://mail.openjdk.java.net/pipermail/security-dev/2019-December/021056.html