jackychee opened a new issue #985: grpc-1.x-plugin throw ClassCastException in gRPC-java v1.10.0 URL: https://github.com/apache/incubator-skywalking/issues/985 Please answer these questions before submitting your issue. - Why do you submit this issue? - [ ] Question or discussion - [x] Bug - [ ] Requirement - [ ] Feature or performance improvement ___ ### Question - What do you want to know? ___ ### Bug - Which version of SkyWalking, OS and JRE? SkyWalking5.0.0-alpha - Which company or project? - What happen? In gRPC-java v1.10.0, gRPC framework will wrap ClientCallImpl before giving it back to ManagedChannelImpl's newCall method, so in SkyWalking's ManagedChannelInterceptor's afterMethod，we get a wrapped ClientCallImpl, which is not an EnhancedInstance instance. Also, gRPC framework will wrap ClientCall.Listener instance before giving it back to real ClientCallImpl's start method. Error logs as below. ERROR 2018-03-24 11:48:38 InstMethodsInter : class[class io.grpc.internal.ManagedChannelImpl] after method[newCall] intercept failure java.lang.ClassCastException: io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1 cannot be cast to org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance at org.apache.skywalking.apm.plugin.grpc.v1.ManagedChannelInterceptor.afterMethod(ManagedChannelInterceptor.java:46) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105) at io.grpc.internal.ManagedChannelImpl.newCall(ManagedChannelImpl.java) at io.grpc.stub.ClientCalls.blockingUnaryCall$original$mSPjc7Ob(ClientCalls.java:117) at io.grpc.stub.ClientCalls.blockingUnaryCall$original$mSPjc7Ob$accessor$FzAWtERM(ClientCalls.java) at io.grpc.stub.ClientCalls$auxiliary$5f2iLj6c.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.StaticMethodsInter.intercept(StaticMethodsInter.java:86) at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java) at io.grpc.examples.routeguide.RouteGuideGrpc$RouteGuideBlockingStub.getFeature(RouteGuideGrpc.java:404) at io.grpc.examples.routeguide.RouteGuideClient.getFeature(RouteGuideClient.java:76) at io.grpc.examples.routeguide.RouteGuideClient.main(RouteGuideClient.java:264) ___ ### Requirement or improvement - Please describe about your requirements or improvement suggestions.
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