myoss opened a new issue #694: [Agent] spring boot client start failed URL: https://github.com/apache/incubator-skywalking/issues/694 Please answer these questions before submitting your issue. ### What version of sky-walking are you using? 3.2.6 What is the cause? help me, thanks. ``` DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.log.logback.v1.x.LogbackPatternConverterActivation. DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.log.logback.v1.x.mdc.MDCConverterActivation. DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.trace.ActiveSpanTagActivation. DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.trace.TraceAnnotationActivation. DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.trace.TraceContextActivation. DEBUG 2017-12-20 11:11:24 PluginBootstrap : loading plugin class org.skywalking.apm.toolkit.activation.log.log4j.v2.x.Log4j2OutputAppenderActivation. DEBUG 2017-12-20 11:11:24 GRPCChannelManager : Selected collector grpc service running, reconnect:true. DEBUG 2017-12-20 11:11:24 GRPCChannelManager : Selected collector grpc service is not available. Wait 30 seconds to retry DEBUG 2017-12-20 11:11:24 AppAndServiceRegisterClient : AppAndServiceRegisterClient running, status:DISCONNECT. ERROR 2017-12-20 11:11:25 ServiceManager : ServiceManager try to shutdown [org.skywalking.apm.agent.core.sampling.SamplingService] fail. java.lang.NullPointerException at org.skywalking.apm.agent.core.sampling.SamplingService.shutdown(SamplingService.java:85) at org.skywalking.apm.agent.core.boot.ServiceManager.shutdown(ServiceManager.java:51) at org.skywalking.apm.agent.SkyWalkingAgent$1.run(SkyWalkingAgent.java:66) at java.lang.Thread.run(Thread.java:745) DEBUG 2017-12-20 11:11:25 GRPCChannelManager : Selected collector grpc service shutdown. ```
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