The problem is in the Eclipse Maven support, the related question is here.
Under Eclipse, the java.home variable is set to the JRE that was used to start Eclipse, not the build JRE. The default system JRE from C:\Program Files doesn’t include the JDK so tools.jar is not being found.
To fix the issue you need to start Eclipse using the JRE from the JDK by adding something like this to eclipse.ini (before -vmargs!):
-vm
C:/<your_path_to_jdk170>/jre/bin/server/jvm.dll
Then refresh the Maven dependencies (Alt-F5) (Just refreshing the project isn’t sufficient).