Hi,
We're seeing an issue with how WebResources are cached that started occurring in Tomcat 8.0.39 (we're using Ubuntu Xenial but I don't believe it's related to anything in the OS). Some of the CSS/JS files that we serve are packed inside JAR files. These files are served by a filter that listens for an allowed path, /_resource/* in this case, and then uses Thread.currentThread().getContextClassLoader(). getResourceAsStream(path) to fetch them out of the appropriate jar file and serve them. The issue we're seeing in 8.0.39 and later is that the lookup using getResourceAsStream(path) returns null. We've traced the issue to this specific commit: https://github. com/apache/tomcat80/commit/184703b966fab28a27eddf4a49014bf92e5a34eb. This is the expected request flow: - User requests /_resource/bootstrap/js/bootstrap.js which is embedded in a JAR included in the WAR file - ResourceFilter (our simple filter in the example project below) looks up the resource using getResourceAsStream(path) - If a stream is return it's copied to the response and processing stops What we think is happening when the issue occurs in 8.0.39: - User requests /_resource/bootstrap/js/bootstrap.js which is embedded in a JAR included in the WAR file - Tomcat Mapper looks for the resource and fails to find it and caches an EmptyResource for that path - ResourceFilter (our simple filter in the example project below) looks up the resource using getResourceAsStream(path) - The resource isn't found because the EmptyResource is cached I've created a small example project that exhibits this behavior: https://github.com/beetlebugorg/tomcat-8-cache-issue At this point we're unsure if this is an actual bug in Tomcat or an incorrect usage of getResourceAsStream(path) on our part so we're looking for advice. Thanks, Jeremy -- JEREMY COLLINS PERFECTSENSE // BRIGHTSPOT www.perfectsensedigital.com www.brightspot.com O 703-956-5815
