Error in JavaMail : PKIX path building failed unable to find valid certification path to requested target

Question

I am trying to build an email client app in android and right now i want to configure the javaMail part.

i am trying to establish the connection with the imap server

Answer 1

Ok problem solved!

The solution is this:

First get the self-signed certificate from the mail server via openssl:

echo | openssl s_client -connect yoursever:port 2>&1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > yourcert.pem

Then save the yourcert.pem file into this path /Library/Java/Home/lib/security (on macOSX) and put the cert file into the cacerts like this

keytool -keystore cacerts -importcert -alias youralias -file yourcert.pem

The default keystore password is changeit

You can view the change that you made with this command that shows the Certificate fingerprint.

keytool -list -keystore cacerts

After this you should pass these argument in VM

(for windows and linux type yourpath between " " )

-Djavax.net.ssl.trustStore="/Library/Java/Home/lib/security/cacerts"

-Djavax.net.ssl.trustStorePassword="changeit"

For Debug:

-Djava.security.debug=certpath

-Djavax.net.debug=trustmanager