PathResourceResolver should not resolve "/" as a JAR resource [SPR-13241]

[spring-projects-issues]

Brian Clozel opened SPR-13241 and commented

This StackOverflow question demonstrates an issue with resource handling.

The following problem can be reproduced by:

• adding at least one webjar resource on classpath
• configuring it as a resource location
• using the ResourceUrlProvider to resolve "/"

Doing so will call the resource chain to resolve this URL as an existing resource. Even if "/" is not a resource per se, folders within JARs are resolved as existing and readable resources, translating "/" into "" and thus breaking the root application link.

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Affects: 4.1.7

Reference URL: https://github.com/quwahara/stackoverflow-questions-31182261

Referenced from: commits daf94ea, 064abad, 106cce5, 3a4085a

Backported to: 4.1.8