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Solution 1:

This is because java is not recognizing root certificate authority (CA) SSL certificate of https://clojars.org/repo.

Solution is to add that certificate to java cacerts file so that it got permanently accepted.

Step 1 : Get root certificate of https://clojars.org

1. Open https://clojars.org in a chrome browser.
2. locate Lock symbol just besides your address bar and click on it.
3. view Details
4. Click on top most certificate on hierarchy and confirm it is tailed with Root CA phrase.
5. drag and drop that image which you saw written certificate on desktop.

Thats it! you got your root certificate!

Step 2 : Get that certificate added to java cacerts file.

1. use keytool.exe inside your jre bin folder.
2. fire following command to place your certificate inside cacerts file

keytool –import –noprompt –trustcacerts –alias ALIASNAME -file /PATH/TO/YOUR/DESKTOP/CertificateName.cer -keystore /PATH/TO/YOUR/JDK/jre/lib/security/cacerts -storepass changeit

That is it! you got your problem resolved.

PLEASE NOTE

1. Do confirm that the jre which is giving you this PKIX error(JRE used by KAFKA) that is where you are performing STEP 2. If you would try with another jre problem would be as it is.

2. Do use only one jre which is inside JDK it decreases chance to have issues.

Solution 2:

If you are using debian or ubuntu you can execute:

$ sudo update-ca-certificates -f