Iterate over Java object methods with no args and non-void return type and print toString return value (for debugging)

I would like to dump content of complex Java objects for debugging purpose.

For example I want to dump of toString() from return value of all get...() methods of HttpServletRequest object.

I am not interested in fields but rather in methods return values.

I am not sure if it's possible with commons-beanutils or ReflectionToStringBuilder.toString()

Currently I implemented with Introspector core API:

public static String dump(Object obj, String regex) {
    StringBuilder sb = new StringBuilder();

    try {
        BeanInfo info = Introspector.getBeanInfo(obj.getClass());
        for (MethodDescriptor descr : info.getMethodDescriptors()) {
            String name = descr.getName();
            Method method = descr.getMethod();
            if ( ! name.matches(regex))
                continue;
            if (method.getParameterCount() > 0)
                continue;
            if (Stream.class.isAssignableFrom(method.getReturnType()))
                continue;
            Object objValue = method.invoke(obj);
            String strValue = Optional.ofNullable(objValue).map(Object::toString).orElse("null");
            logger.info("name: {}, value: {}", name, strValue);
            sb.append(name);
            sb.append(" => ");
            sb.append(strValue);
            sb.append("\n");
        }
    } catch (IntrospectionException | IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
        ex.printStackTrace();
    }

    return sb.toString();
}

but I would like to use something standard and flexible...