Character n is neither a decimal digit number, decimal point, nor “e“ notation exponential mark.

功能开发中出现一个诡异的异常信息，信息如下

2021-09-27 13:44:57.487 [http-nio-5020-exec-1] ERROR o.a.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NumberFormatException: Character n is neither a decimal digit number, decimal point, nor "e" notation exponential mark.] with root cause
java.lang.NumberFormatException: Character n is neither a decimal digit number, decimal point, nor "e" notation exponential mark.at java.base/java.math.BigDecimal.<init>(BigDecimal.java:518)at java.base/java.math.BigDecimal.<init>(BigDecimal.java:401)at java.base/java.math.BigDecimal.<init>(BigDecimal.java:834)at com.fastonetech.service.impl.SubAccountRecordService.getConsumeAmountByTenantId(SubAccountRecordService.kt:66)at com.fastonetech.service.impl.SubAccountRecordService$$FastClassBySpringCGLIB$$68edf4dd.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)at com.fastonetech.service.impl.SubAccountRecordService$$EnhancerBySpringCGLIB$$28235181.getConsumeAmountByTenantId(<generated>)at com.fastonetech.service.impl.SubAccountService.getAccountRelatedDataTenantId(SubAccountService.kt:276)at com.fastonetech.service.impl.SubAccountService$$FastClassBySpringCGLIB$$468e952e.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)at com.fastonetech.service.impl.SubAccountService$$EnhancerBySpringCGLIB$$ae9f6d14.getAccountRelatedDataTenantId(<generated>)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282)at org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.invoke(GenericScope.java:485)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692)at com.fastonetech.service.impl.SubAccountService$$EnhancerBySpringCGLIB$$387f7ace.getAccountRelatedDataTenantId(<generated>)at com.fastonetech.controller.SubAccountController.balance(SubAccountController.kt:42)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.base/java.lang.Thread.run(Thread.java:834)

定位出现问题的原因：

 override fun getConsumeAmountByTenantId(tenantId: Long): BigDecimal{val queryWrapper: QueryWrapper<SubAccountRecord> = QueryWrapper<SubAccountRecord>()queryWrapper.select("sum(amount) as sum_amount ")queryWrapper.allEq(mapOf("tenant_id" to tenantId, "transaction_type" to TransactionType.ORDER_DEDUCTION))val sumAmountMap=this.getMap(queryWrapper)return sumAmountMap["sum_amount"].toString().toBigDecimal()}

 val sumAmountMap=this.getMap(queryWrapper)

可能获取的是null值，会报错

     override fun getConsumeAmountByTenantId(tenantId: Long): BigDecimal{val queryWrapper: QueryWrapper<SubAccountRecord> = QueryWrapper<SubAccountRecord>()queryWrapper.select("sum(amount) as sum_amount ")queryWrapper.allEq(mapOf("tenant_id" to tenantId, "transaction_type" to TransactionType.ORDER_DEDUCTION))val sumAmountMap=this.getMap(queryWrapper)?: return BigDecimal.ZEROreturn sumAmountMap["sum_amount"].toString().toBigDecimal()}

增加一个null值的判断逻辑

 val sumAmountMap=this.getMap(queryWrapper)?: return BigDecimal.ZERO

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Character n is neither a decimal digit number, decimal point, nor “e“ notation exponential mark.

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