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java.lang.NullPointerException: 	at org.springframework.expression.spel.ast.SpelNodeImpl.(SpelNodeImpl.java:50)	at org.springframework.expression.spel.ast.Indexer.(Indexer.java:71)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.maybeEatIndexer(InternalSpelExpressionParser.java:549)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.maybeEatNonDottedNode(InternalSpelExpressionParser.java:313)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.maybeEatNode(InternalSpelExpressionParser.java:300)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatPrimaryExpression(InternalSpelExpressionParser.java:284)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatUnaryExpression(InternalSpelExpressionParser.java:275)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatPowerIncDecExpression(InternalSpelExpressionParser.java:236)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatProductExpression(InternalSpelExpressionParser.java:217)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatSumExpression(InternalSpelExpressionParser.java:201)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatRelationalExpression(InternalSpelExpressionParser.java:163)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatLogicalAndExpression(InternalSpelExpressionParser.java:151)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatLogicalOrExpression(InternalSpelExpressionParser.java:139)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatExpression(InternalSpelExpressionParser.java:103)	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.doParseExpression(InternalSpelExpressionParser.java:84)	at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:56)	at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:32)	at org.springframework.expression.common.TemplateAwareExpressionParser.parseExpression(TemplateAwareExpressionParser.java:66)	at org.springframework.binding.expression.spel.SpringELExpressionParser.parseSpelExpression(SpringELExpressionParser.java:81)	at org.springframework.binding.expression.spel.SpringELExpressionParser.parseExpression(SpringELExpressionParser.java:75)	at org.springframework.webflow.mvc.view.AbstractMvcView.addEmptyValueMapping(AbstractMvcView.java:479)	at org.springframework.webflow.mvc.view.AbstractMvcView.addDefaultMappings(AbstractMvcView.java:461)	at org.springframework.webflow.mvc.view.AbstractMvcView.bind(AbstractMvcView.java:380)	at org.springframework.webflow.mvc.view.AbstractMvcView.processUserEvent(AbstractMvcView.java:216)	at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:226)	at org.springframework.webflow.engine.ViewState.resume(ViewState.java:196)	at org.springframework.webflow.engine.Flow.resume(Flow.java:545)	at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)	at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)	at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:915)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at com.dailyaccess.loggingmodule.filter.UserActivityLoggingFilter.doFilter(UserActivityLoggingFilter.java:70)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)	at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)