code: public static String addResourcePathToPackagePath(Class<?> clazz, String resourceName) {
  		Assert.notNull(resourceName, "Resource name must not be null");
  		if (!resourceName.startsWith("/")) {
  			return classPackageAsResourcePath(clazz) + "/" + resourceName;
  		}
  		return classPackageAsResourcePath(clazz) + resourceName;
  	}
docs: Return a path suitable for use with {@code ClassLoader.getResource}
  (also suitable for use with {@code Class.getResource} by prepending a
  slash ('/') to the return value). Built by taking the package of the specified
  class file, converting all dots ('.') to slashes ('/'), adding a trailing slash
  if necessary, and concatenating the specified resource name to this.
  <br/>As such, this function may be used to build a path suitable for
  loading a resource file that is in the same package as a class file,
  although {@link org.springframework.core.io.ClassPathResource} is usually
  even more convenient.
  @param clazz    the Class whose package will be used as the base
  @param resourceName the resource name to append. A leading slash is optional.
  @return the built-up resource path
  @see ClassLoader#getResource
  @see Class#getResource