examples项目启动想知道有哪些错误，通过日志了解代码执行逻辑，但是启动SimpleConsumerDemo了报错如下：
log4j.proproties也配置了
log4j.proproties配置如下：
# Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. log4j.rootLogger=DEBUG, stdout, log log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=[%d] %p %m (%c:%L)%n log4j.logger.kafka=DEBUG log4j.logger.org.apache.kafka=DEBUG ### log file ### log4j.appender.log = org.apache.log4j.DailyRollingFileAppender log4j.appender.log.File = /Users/lizhitao/code/kafka-0.11.0.2-src/examples/logs/kafka.log log4j.appender.log.Append = true log4j.appender.log.Threshold = DEBUG log4j.appender.log.DatePattern='.'yyyy-MM-dd log4j.appender.log.layout = org.apache.log4j.PatternLayout log4j.appender.log.layout.ConversionPattern = [kafka][%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C.%M(%L) | %m%n # zkclient can be verbose, during debugging it is common to adjust is separately log4j.logger.org.I0Itec.zkclient.ZkClient=WARN log4j.logger.org.apache.zookeeper=WARN
No appenders could be found for logger，意思是log4.proproties找不到，如果默认位置找不到，我们可以自行动态配置
generateData()方法加入如下log4j配置代码：
PropertyConfigurator.configure("/Users/lizhitao/code/xxx-proj/kafka-0.11.0.2-src/examples/src/main/resources/log4j.properties");
再次启动SimpleConsumerDemo，搞定，日志有输出
