This relates to#33199

Due to the custom encryption of JARs we have a customjava.net.URLStreamHandler on URL instance.
In recent versions (from 6.1.x) the reimplemented methodorg.springframework.util.ResourceUtils#toRelativeURL fails to retain the originalURLStreamHandler on the root URL instance. Instead, it uses only the string part of the URL and creates a new one.

6.1.x:
toURL(StringUtils.applyRelativePath(root.toString(), relativePath));

vs
6.0.x:
new URL(root, relativePath);

I propose similar approach as was the fix for#33199

if (ResourceUtils.toURL(root.toString()).equals(root)) {// Plain URL with default URLStreamHandler -> replace with cleaned path.returntoURL(StringUtils.applyRelativePath(root.toString(),relativePath));;}else {// Retain original URL instance, potentially including custom URLStreamHandler.returnnewURL(root,relativePath);}