请问为什么会出现Exception in thread "pool-1-thread-1" java.lang.NoSuchMethodError: com.google.common.collect.Maps.asMapEntryIterator

[fonxian]

刚开始用WebMagic
按照 http://webmagic.io/docs/zh/ 教程上试第一个爬虫的例子
出现错误，但是我在maven中添加了guava 15.0的依赖，但是依然没有用。
想请问是什么原因？
Exception in thread "pool-1-thread-1" java.lang.NoSuchMethodError: com.google.common.collect.Maps.asMapEntryIterator(Ljava/util/Set;Lcom/google/common/base/Function;)Ljava/util/Iterator; at com.google.common.collect.StandardTable$RowMap$EntrySet.iterator(StandardTable.java:771) at us.codecraft.webmagic.downloader.HttpClientGenerator.generateCookie(HttpClientGenerator.java:84) at us.codecraft.webmagic.downloader.HttpClientGenerator.generateClient(HttpClientGenerator.java:73) at us.codecraft.webmagic.downloader.HttpClientGenerator.getClient(HttpClientGenerator.java:45) at us.codecraft.webmagic.downloader.HttpClientDownloader.getHttpClient(HttpClientDownloader.java:63) at us.codecraft.webmagic.downloader.HttpClientDownloader.download(HttpClientDownloader.java:92) at us.codecraft.webmagic.Spider.processRequest(Spider.java:408) at us.codecraft.webmagic.Spider$1.run(Spider.java:322) at us.codecraft.webmagic.selector.thread.CountableThreadPool$1.run(CountableThreadPool.java:74) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

[fonxian]

原因是：maven的依赖包冲突
解决方法：去掉其他的依赖包，之间只保留
<dependency> <groupId>us.codecraft</groupId> <artifactId>webmagic-core</artifactId> <version>0.5.3</version> </dependency> <dependency> <groupId>us.codecraft</groupId> <artifactId>webmagic-extension</artifactId> <version>0.5.2</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency>
就可以解决上述问题

[code4craft]

赞一个！