Important Links

SSLHandshakeException

Exception: 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

Reason : jvm might need required certificates

Possible Solution : SO-Solution

How to check for open ports in a unix machine

  • sudo netstat -tunlp
    • -t - Show TCP ports.
    • -u - Show UDP ports.
    • -n - Show numerical addresses instead of resolving hosts.
    • -l - Show only listening ports.
    • -p - Show the PID and name of the listener’s process. This information is shown only if you run the command as root or sudo user.
  • netstat -tnlp | grep :22 - to filter for particular ports

How to switch java versions easily

Nice discussion here : so-link

excerpt

alias java17="export JAVA_HOME=`/usr/libexec/java_home -v 17`; java -version"
alias java11="export JAVA_HOME=`/usr/libexec/java_home -v 11`; java -version"
alias java8="export JAVA_HOME=`/usr/libexec/java_home -v 1.8`; java -version"