ERROR [ExceptionFilter] [DUBBO] Got unchecked and undeclared exception which called by 10.165.31.88

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ERROR [ExceptionFilter] [DUBBO] Got unchecked and undeclared exception which called by 10.165.31.88. service: com.inspur.eTicket.service.user.StudentInfoService, method: selectStudentInfoByParams, exception: java.lang.NullPointerException: null, dubbo version: 2.8.4, current host: 127.0.0.1
java.lang.NullPointerException
   at java.util.concurrent.ConcurrentHashMap.get(Unknown Source)
   at com.inspur.taxinvoicebase.appframe.server.SessionContext.initSessionInfo(SessionContext.java:100)
   at com.inspur.taxinvoicebase.distriservice.filter.DubboContextFilter.invoke(DubboContextFilter.java:17)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:64)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:70)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:132)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:113)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170)
   at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52)
   at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)

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