Java macOS Keystore CA

readme.md

see https://blog.alwold.com/2011/06/30/how-to-trust-a-certificate-in-java-on-mac-os-x/

cd $(/usr/libexec/java_home)/jre/lib/security

password "changeit"

sudo keytool -importcert -file <CAFILE> -alias <CAALIAS> -keystore cacerts

Test Java SSL Keystore

https://gist.github.com/4ndrej/4547029

Test TLS Connection with Java

javac SSLPoke.java
java SSLPoke <host> <port>

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();
        }
    }
}