org.apache.ibatis.binding.BindingException: Mapper method 'com.danaaa.cm.dao.AgentWithdrawalMapper.getTotalByWeek attempted to return null from a method with a primitive return type (float). at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:69) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:43) at com.sun.proxy.Proxy222.getTotalByWeek(UnknownSource)atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)atjava.lang.reflect.Method.invoke(Method.java:606)atorg.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)atorg.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)atorg.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)atorg.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)atcom.sun.proxy.Proxy223.getTotalByWeek(Unknown Source)