Confluence Email Send SSL issue - Add certificate to java keystore ( Linux )

SSLPoke.java

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;

/** Establish a SSL connection to a host and port, writes a byte and
 * prints the response. See
 * http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services
 */
public class SSLPoke {
    public static void main(String[] args) {
        if (args.length != 2) {
            System.out.println("Usage: "+SSLPoke.class.getName()+" <host> <port>");
            System.exit(1);
        }
        try {
            SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
            SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket(args[0], Integer.parseInt(args[1]));

            InputStream in = sslsocket.getInputStream();
            OutputStream out = sslsocket.getOutputStream();

            // Write a test byte to get a reaction :)
            out.write(1);

            while (in.available() > 0) {
                System.out.print(in.read());
            }
            System.out.println("Successfully connected");

        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
}

Test of java SSL / keystore / cert setup. Came from https://confluence.atlassian.com/download/attachments/117455/SSLPoke.java

Usage:

extract cert from server to yourcert.crt file:
openssl s_client -connect server:443

negative test cert / keytool:
java SSLPoke server 443
you should get something like
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

import cert into default keytool: ( default password for keystore "changeit" )
keytool -import -alias alias.server.com -keystore $JAVA_HOME/jre/lib/security/cacerts -file yourcert.crt

positive test cert / keytool:
java SSLPoke server 443
you should get this:
Successfully connected

---

1. If you have problem with JRE ( which ) , run this,
   readlink -f $(which java)

2. Add certificates to Confluence runtime
   /opt/atlassian/confluence/jre/lib/security/cacert