docs: public boolean requiredPropertiesArePresent() {
          // trust store specified OR key store specified OR both -> valid
          boolean valid = (
          // explicit keystore and truststore exists
          (propertyExists(Constants.SSLPROP_KEY_STORE)
           && propertyExists(Constants.SSLPROP_TRUST_STORE)));
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(tc, "requiredPropertiesArePresent -> " + valid);
          return valid;
      }