raphw commented on issue #117: Can't see any traces in skywalking UI URL: https://github.com/apache/incubator-skywalking-ui/issues/117#issuecomment-370164495 Byte Buddy requests class files from the class loader that defines a class. This includes any linked type referenced by this class, e.g. superclasses or interfaces. It seems like requesting `classLoader.getResourceAsStream("org.apache.cxf.ws.policy.AbstractPolicyInterceptorProvider.class")` returns `null` which causes this exception. If you know a better way of locating the class file, you can implement a custom `LocationStrategy`. Alternatively, you can have a look at `RedefinitionStrategy.ResubmissionScheduler`. Using the latter, you can attempt to redefine a class that was loaded where Byte Buddy can use loaded classes rather then rely on class file location what is more reliable but what also requires that your instrumentation does not change the class file layout. As for your matcher: does the stack trace indicate that the exception comes from the matching?
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