flysqrlboy commented on issue #1547: Some span segments in a trace disappeared In my custom agent plugin URL: https://github.com/apache/incubator-skywalking/issues/1547#issuecomment-415968936 With the help of @wu-sheng , I found the cause of the issue. It turns out some exceptions occurred when collectors received segment info from agents. The exception as below (from apache-skywalking-apm-incubating/logs/skywalking-collector-server.log): ``` java.lang.NullPointerException: null at org.apache.skywalking.apm.collector.configuration.service.ComponentLibraryCatalogService.getComponentId(ComponentLibraryCatalogService.java:50) ~[collector-configuration-provider-5.0.0-beta2.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.analysis.segment.parser.provider.parser.standardization.SpanIdExchanger.exchange(SpanIdExchanger.java:62) ~[segment-parser-provider-5.0.0-beta2.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.analysis.segment.parser.provider.parser.SegmentParse.preBuild(SegmentParse.java:119) ~[segment-parser-provider-5.0.0-beta2.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.analysis.segment.parser.provider.parser.SegmentParse.parse(SegmentParse.java:67) [segment-parser-provider-5.0.0-beta2.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.analysis.segment.parser.provider.service.SegmentParseService.parse(SegmentParseService.java:42) [segment-parser-provider-5.0.0-beta2.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.agent.grpc.provider.handler.TraceSegmentServiceHandler$1.onNext(TraceSegmentServiceHandler.java:51) [agent-grpc-provider-5.0.0-beta2.jar.bak.jar:5.0.0-beta2] at org.apache.skywalking.apm.collector.agent.grpc.provider.handler.TraceSegmentServiceHandler$1.onNext(TraceSegmentServiceHandler.java:45) [agent-grpc-provider-5.0.0-beta2.jar.bak.jar:5.0.0-beta2] at io.grpc.stub.ServerCalls$StreamingServerCallHandler$StreamingServerCallListener.onMessage(ServerCalls.java:248) [grpc-stub-1.10.0.jar:1.10.0] at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailable(ServerCallImpl.java:252) [grpc-core-1.10.0.jar:1.10.0] at io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1MessagesAvailable.runInContext(ServerImpl.java:629) [grpc-core-1.10.0.jar:1.10.0] at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) [grpc-core-1.10.0.jar:1.10.0] at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) [grpc-core-1.10.0.jar:1.10.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_144] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_144] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144] ``` It tells us that it returns null when "getComponentId" method be invoked. Because the "DC" is my custom component, but I didn't declared it in the "config/component-libraries.yml" file. The solution of the problem is to add the declarations of "DC" in component-libraries.yml, like this: ``` DC: id: 10001 languages: Java ```
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