Version: 5.0.0-beta2

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ERROR 2018-08-21 10:59:42 InstMethodsInter :  class[class 
org.apache.catalina.core.StandardHostValve] after method[invoke] intercept 
failure 
java.lang.NullPointerException
        at 
org.apache.skywalking.apm.agent.core.context.ContextManager.activeSpan(ContextManager.java:155)
        at 
org.apache.skywalking.apm.plugin.tomcat78x.TomcatInvokeInterceptor.afterMethod(TomcatInvokeInterceptor.java:78)
        at 
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1756)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1715)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

ERROR 2018-08-21 10:59:44 InstMethodsInter :  class[class 
org.apache.catalina.core.StandardHostValve] after method[invoke] intercept 
failure 
java.lang.NullPointerException
        at 
org.apache.skywalking.apm.agent.core.context.ContextManager.activeSpan(ContextManager.java:155)
        at 
org.apache.skywalking.apm.plugin.tomcat78x.TomcatInvokeInterceptor.afterMethod(TomcatInvokeInterceptor.java:78)
        at 
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1756)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1715)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

ERROR 2018-08-21 10:59:49 InstMethodsInter :  class[class 
org.apache.catalina.core.StandardHostValve] after method[invoke] intercept 
failure 
java.lang.NullPointerException
        at 
org.apache.skywalking.apm.agent.core.context.ContextManager.activeSpan(ContextManager.java:155)
        at 
org.apache.skywalking.apm.plugin.tomcat78x.TomcatInvokeInterceptor.afterMethod(TomcatInvokeInterceptor.java:78)
        at 
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1756)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1715)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

[ Full content available at: 
https://github.com/apache/incubator-skywalking/issues/1578 ]
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