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java.lang.NullPointerException: 	at ConnectionPerClient.doGet(connectionperclient.java:85)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at filters.ExampleFilter.doFilter(ExampleFilter.java:149)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)	at java.lang.Thread.run(Thread.java:484)