The keytool password for the Java security cacerts file is ... alvin January 22, 2018 - 8:12pm

In case you ever need to manually a certificate to your ${JAVA_HOME}/jre/lib/security/cacerts file, it turns out the password for that file when using the Java keytool command is changeit.

To add a certificate to that file, you’ll want to use a command like this:

keytool \
    -import \
    -alias "" \
    -keystore ${JAVA_HOME}/jre/lib/security/cacerts \

I had to do this today for a Java/Scala script that accesses an HTTPS URL, and the site I’m accessing uses a “Let’s Encrypt” certificate.

A Java HTTPS client example

Java HTTPS client FAQ: Can you share some source code for a Java HTTPS client application?

Sure, here's the source code for an example Java HTTPS client program I just used to download the contents of an HTTPS (SSL) URL. I actually found some of this in a newsgroup a while ago, but I can't find the source today to give them credit, so my apologies for that.