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Update the jar `Handler` class to support a non-reflective fallback mechanism when possible. The updated code attempts to capture a regular jar URL before our handler is installed. It can then use that URL as context when creating the a fallback URL. The JDK jar `Handler` will be copied from the context URL to the fallback URL. Without this commit, resolving new Tomcat URLs of the form `jar:war:file:...` would result in an ugly "Illegal reflective access" warning. Fixes gh-18631