Directory excluding in sonar-project.properties file doesn't work (for me)

Question

I have excluded the directory in my project properties but sonar doesn't exclude it. Can anyone help me to find problem?

sonar.sources=./ 
sonar.exclusions=./utility/Excel/**

Answer 1

I realized that first I should have written directory name Like below to exclude all folders and file on that directory:

 sonar.exclusions=utility/Excel/**/*

Second I should have used comma separated directory names to exclude more than one directory:

 sonar.exclusions=utility/Excel/**/* , utility/mailer/**/*