code: public String determinePassword() {
  		if (StringUtils.hasText(this.password)) {
  			return this.password;
  		}
  		if (EmbeddedDatabaseConnection.isEmbedded(determineDriverClassName())) {
  			return "";
  		}
  		return null;
  	}
docs: Determine the password to use based on this configuration and the environment.
  @return the password to use
  @since 1.4.0