一寓免、前言

問題：正式服務(wù)器上有一個BUG罩驻，但是本地復(fù)現(xiàn)不了。于是查看日志筝家，發(fā)現(xiàn)日志居然沒有打印有效的錯誤提示轧钓，都是一些代理類的調(diào)用序厉。
代碼：

try{
   ......
}catch (Exception e) {
  e.printStackTrace();
    if (BusinessException.class == e.getClass()) {
        throw new BusinessException(e.getMessage());
    } else {
        throw new BusinessException("導(dǎo)入失敗毕箍！");
    }
}

日志：

com.xxx.common.exception.BusinessException: 導(dǎo)入失敵诜俊！
    at com.xxx.system.service.am.impl.CityMarketServiceImpl.importData(CityMarketServiceImpl.java:964)
    at com.xxx.system.service.am.impl.CityMarketServiceImpl$$FastClassBySpringCGLIB$$5ac06249.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)

結(jié)果：拋出的異常被BusinessException覆蓋而柑，導(dǎo)致異常鏈被覆蓋文捶，無法寫入到日志文件中。

二牺堰、解決辦法

private static final Logger log = LoggerFactory.getLogger(CityMarketServiceImpl.class);
try{
   ......
}catch (Exception e) {
  e.printStackTrace();
    if (BusinessException.class == e.getClass()) {
        throw new BusinessException(e.getMessage());
    } else {
        log.error(e.getMessage());
        throw new BusinessException("導(dǎo)入失斨羟帷！");
    }
}

三伟葫、總結(jié)

日志框架使用不夠熟悉恨搓。平時代碼不夠重視日志輸出，沒有仔細研究過這一塊東西筏养。