PathMatchingResourcePatternResolver cannot search for "classpath*" patterns in a jar file roots [SPR-12095]

[spring-projects-issues]

Phil Webb opened SPR-12095 and commented

When using the PathMatchingResourcePatternResolver against a standard URLClassLoader patterns of the form classpath*:somefile*.properties will not pick up resources from JAR files.

This is due to findAllClassPathResources calling ClassLoader.getResources("") which unfortunately doesn't seem to include JAR URLs in the result.

Spring Boot encountered this issue and created a workaround in commit eb721b1e which might be generally applicable.

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Affects: 4.0.6

Reference URL: spring-projects/spring-boot#1378

Issue Links:

• Regression: DLL handled as classpath resource [SPR-12928] #17521 Regression: DLL handled as classpath resource
• PathMatchingResourcePatternResolver should close jar file from JarURLConnection if not cached [SPR-6295] #10961 PathMatchingResourcePatternResolver should close jar file from JarURLConnection if not cached
• PathMatchingResourcePatternResolver does not consider manifest based classpaths [SPR-13685] #18260 PathMatchingResourcePatternResolver does not consider manifest based classpaths

Referenced from: commits spring-projects/spring-boot@650e326

[spring-projects-issues]

Juergen Hoeller commented

I've added this for 4.1 GA in a slightly revised fashion. Phil Webb, you might want to use UrlResource.exists() in your workaround subclass as well instead of a dangling URL.openConnection() call (which may leave files open in the file system until the VM shuts down).

Juergen