https://bz.apache.org/bugzilla/show_bug.cgi?id=63970

            Bug ID: 63970
           Summary: java.lang.ClassCastException:
                    org.apache.catalina.webresources.CachedResource$Cached
                    ResourceURLConnection cannot be cast to
                    java.net.JarURLConnection
           Product: Tomcat 8
           Version: 8.5.49
          Hardware: PC
                OS: Mac OS X 10.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: dmitry.tresku...@jetbrains.com
  Target Milestone: ----

The following code starts throwing a ClassCastException after upgrading to
Tomcat 8.5.49:

URL url = this.getClass().getResource("/preset.propetries");
String scheme = url.getProtocol();
if ("jar".equals(scheme)) {
      JarURLConnection con = (JarURLConnection) url.openConnection();
}


I guess it happens because of this commit
https://github.com/apache/tomcat/commit/03e7bc8487cb706adf1f56586948a7762dd42d14#diff-b718dcafc40f187cc9aaa1518e63033d

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