`UrlResource.getFilename()` decodes `+` sign to a space

[sumanparia]

https://github.com/spring-projects/spring-framework/blob/main/spring-core/src/main/java/org/springframework/core/io/UrlResource.java

While reading the files inside jar I am using ResourcePatternResolver.getResources.
Its returning UrlResource[].

But if any file name having + sign then UrlResource.getFilename removing the + sign and replacing it with space.

sample+filename.json

I think its because of

https://github.com/spring-projects/spring-framework/blob/3666ad9d7fb0e905322b81debda7b2e2e822a4e0/spring-core/src/main/java/org/springframework/core/io/UrlResource.java#L372C3-L372C90

return (filename != null ? URLDecoder.decode(filename, StandardCharsets.UTF_8) : null);

Why we are using decode and any work around?

[sbrannen]

We started decoding the filename in Spring Framework 6.0 to align with the behavior of FileSystemResource.

• See UrlResource#getFilename() should return unencoded file name #29261

[sbrannen]

Note that the Javadoc for the UrlResource(String) constructor states the following (bold emphasis mine).

Create a new UrlResource based on a URI path.

Note: The given path needs to be pre-encoded if necessary.

In general, UrlResource expects the underlying URL/URI to be properly encoded.

In addition, PathMatchingResourcePatternResolver.convertClassLoaderURL(URL) performs "URI decoding for special characters such as spaces" for the file: protocol.

So, we'd like to know exactly how you are using ResourcePatternResolver.getResources(...). For example, what is the locationPattern that you are supplying?

In addition, please provide a minimal example or sample application that reproduces the issue -- preferably something that we can download and run.

Thanks