protected String resolvePlaceholder(String property, String defaultValue) throws IllegalStateException {
    """
	Search for the given placeholder in system properties then in environment variables.
	
	@param property     property to resolve
	@param defaultValue Default value if the placeholder is not found. <code>null</code> means not default value is
	defined and the placeholder must exist
	@return the resolved property or the default value if the placeholder is not found and the default value is defined. Non null.
	@throws IllegalStateException if the placeholder is not found and the given <code>defaultValue</code> is not
	defined (<code>null</code>)
    """


        // "graphite.host" -> "GRAPHITE_HOST"
        String environmentVariableStyleProperty = property.toUpperCase();
        environmentVariableStyleProperty = environmentVariableStyleProperty.replaceAll("\\.", "_");

        String result;
        if (externalProperties.containsKey(property)) {
            result = externalProperties.get(property);
        } else if (System.getProperties().containsKey(property)) {
            result = System.getProperty(property);
        } else if (System.getenv().containsKey(property)) {
            result = System.getenv(property);
        } else if (System.getenv().containsKey(environmentVariableStyleProperty)) {
            result = System.getenv(environmentVariableStyleProperty);
        } else if (defaultValue != null) {
            result = defaultValue;
        } else {
            throw new IllegalStateException("Property '" + property + "' not found in System properties nor in Environment variables");
        }
        return result;
    }
protected String resolvePlaceholder(String property, String defaultValue) throws IllegalStateException {


        // "graphite.host" -> "GRAPHITE_HOST"
        String environmentVariableStyleProperty = property.toUpperCase();
        environmentVariableStyleProperty = environmentVariableStyleProperty.replaceAll("\\.", "_");

        String result;
        if (externalProperties.containsKey(property)) {
            result = externalProperties.get(property);
        } else if (System.getProperties().containsKey(property)) {
            result = System.getProperty(property);
        } else if (System.getenv().containsKey(property)) {
            result = System.getenv(property);
        } else if (System.getenv().containsKey(environmentVariableStyleProperty)) {
            result = System.getenv(environmentVariableStyleProperty);
        } else if (defaultValue != null) {
            result = defaultValue;
        } else {
            throw new IllegalStateException("Property '" + property + "' not found in System properties nor in Environment variables");
        }
        return result;
    }
protected String resolvePlaceholder ( String property , String defaultValue ) throws IllegalStateException { // "graphite.host" -> "GRAPHITE_HOST" String environmentVariableStyleProperty = property . toUpperCase ( ) ; environmentVariableStyleProperty = environmentVariableStyleProperty . replaceAll ( "\\." , "_" ) ; String result ; if ( externalProperties . containsKey ( property ) ) { result = externalProperties . get ( property ) ; } else if ( System . getProperties ( ) . containsKey ( property ) ) { result = System . getProperty ( property ) ; } else if ( System . getenv ( ) . containsKey ( property ) ) { result = System . getenv ( property ) ; } else if ( System . getenv ( ) . containsKey ( environmentVariableStyleProperty ) ) { result = System . getenv ( environmentVariableStyleProperty ) ; } else if ( defaultValue != null ) { result = defaultValue ; } else { throw new IllegalStateException ( "Property '" + property + "' not found in System properties nor in Environment variables" ) ; } return result ; }
Search for the given placeholder in system properties then in environment variables.

@param property     property to resolve
@param defaultValue Default value if the placeholder is not found. <code>null</code> means not default value is
defined and the placeholder must exist
@return the resolved property or the default value if the placeholder is not found and the default value is defined. Non null.
@throws IllegalStateException if the placeholder is not found and the given <code>defaultValue</code> is not
defined (<code>null</code>)
Search for the given placeholder in system properties then in environment variables .