Code example for DefaultConversionService

0
	 * @param beanFactory a bean factory to use for resolving {@code ${...}} placeholder 
	 * and {@code #{...}} SpEL expressions in default values, or {@code null} if default 
	 * values are not expected to contain expressions 
	 */ 
	protected AbstractNamedValueMethodArgumentResolver(ConversionService cs, ConfigurableBeanFactory beanFactory) {
		this.conversionService = (cs != null ? cs : new DefaultConversionService());
		this.configurableBeanFactory = beanFactory;
		this.expressionContext = (beanFactory != null ? new BeanExpressionContext(beanFactory, null) : null);
	} 
 
 
	@Override 
	public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
		Class<?> paramType = parameter.getParameterType();
		NamedValueInfo namedValueInfo = getNamedValueInfo(parameter);
 
		Object arg = resolveArgumentInternal(parameter, message, namedValueInfo.name);
		if (arg == null) {
			if (namedValueInfo.defaultValue != null) {
				arg = resolveDefaultValue(namedValueInfo.defaultValue);
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