Creating HTTPS connection to host:node2.vijfhuizen.local, port:8021
unable to find valid certification path to requested target
This issue comes that the runtime Java of JDeveloper does not have the correct certificates loaded in your keystore. You should copy these certificates in your local keystore (cacerts), this file is located in $JAVA_HOME/jre/lib/security.
Implementing this solution is written here.
mv $JAVA_HOME/jre/lib/security/cacerts $JAVA_HOME/jre/lib/security/cacerts.org cp jssecacerts $JAVA_HOME/jre/lib/security