javax.net.ssl.SSLHandshakeException while connecting using REST API -JAVA

[Deleted user]

Code

HttpResponse<JsonNode> response = Unirest.get("https://team-XXX.atlassian.net/rest/api/2/issue/Issue1")
.basicAuth("XXX@gmail.com", "Token")
.header("Accept", "application/json")
.asJson();

System.out.println(response.getBody());

Exception

com.mashape.unirest.http.exceptions.UnirestException: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:143)
at com.mashape.unirest.request.BaseRequest.asJson(BaseRequest.java:68)
at vdc.libraries.module.JIRALib.fnCreateJiraTicket(JIRALibrary.java:33)
at vdc.test.TriggerTestSteps.stepCreateJIRATicket(Steps.java:214)
at vdc.test.TriggerTest.main(Trigger.java:25)