mvn clean install is giving error "PKIX path building failed. unable to find valid certification path"

Issue: When trying to execute "maven clean install", I am getting an error message saying "PKIX path building failed. unable to find valid certification path"

Reasons:

• Certificates to the nexus repository are not imported to JDK trust store. To do this follow the below steps
• Open the nexus url in chrome browser
• Click on lock button in the address bar to the left of the url.
• Click "Connection is secure". 
• Click "Certificate is valid".
• Go to tab "Details"
• Export the certificate to some local path say "/Users/asood/Downloads/www.amazon.in.cer" 
• Find the installation path of the jdk 
• Navigate to lib/security directory
• Import the above certificate into cacerts truststore using command
• keytool -import -alias myalias -file /Users/asood/Downloads/www.amazon.in.cer -keystore cacerts
• Try mvn clean install again and it should be ok now
• The jdk used by maven is different from the default jdk home set for the machine. To check this follow the below steps
• Run command 
• mvn --version
• Confirm if the jdk path is same as that being used default jdk home.
• If not, there are 2 options
1. Change the path of java used by maven to be same as the default jdk home
2. Add the certificates to the lib/security/cacerts by following the steps mentioned above