# add a certificate to the JRE cacerts file
keytool -importcert -noprompt -trustcacerts -alias <alias name> -file <certfile> \
        -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -v

# search for certificate in the cacerts file
keytool -list -keystore $JAVA_HOME/java/jre/lib/security/cacerts -storepass changeit | fgrep -i <alias name>

# delete certificate from the JRE cacerts file
keytool -delete -alias <alias name> -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -v