With Java 9, the way the Java platform's version is displayed has changed. Here is an example of a Java 8 version format:

Now let's look at how Java 9 reports its version:

As you can see, with Java 9, the version schema is $MAJOR.$MINOR.$SECURITY.$PATCH. This is markedly different from previous versions of Java. This will only impact your applications if you have code that parses the string returned by the java -version command and option.

Lastly, let's see how Java 10 (18.3) reports its version:

With Java 10, 11, and for the foreseeable future, the version schema is $YY.$MM. This is a change starting with Java 10. If you have any code that evaluates what is returned by the java -version command and option, you will likely need to update your code.