Java Eclipse MapReduce错误:不可修改的映射
因此,我是Hadoop和MapReduce的新手,正在尝试创建一个简单的字数计算程序。但是,在运行时,我遇到了一个错误:Java Eclipse MapReduce错误:不可修改的映射,java,eclipse,hadoop,jar,mapreduce,Java,Eclipse,Hadoop,Jar,Mapreduce,因此,我是Hadoop和MapReduce的新手,正在尝试创建一个简单的字数计算程序。但是,在运行时,我遇到了一个错误: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/map/UnmodifiableMap at org.apache.hadoop.conf.Configuration$DeprecationContext.<init>(Configu
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/map/UnmodifiableMap
at org.apache.hadoop.conf.Configuration$DeprecationContext.<init>(Configuration.java:409)
at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:448)
at com.Cameron.WordCount.main(WordCount.java:51)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.map.UnmodifiableMap
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 3 more
我也遇到了类似的错误。我正在使用lunaeclipse()浏览cloudera5.8教程
您需要Apache Commons Collections»3.2.1(而不是4.1),将其添加到构建路径中,它应该会运行。我遇到了类似的错误。我正在使用lunaeclipse()浏览cloudera5.8教程 您需要Apache Commons Collections»3.2.1(而不是4.1),将其添加到构建路径中,它应该运行
commons-collections4-4.1.jar
commons-lang-2.6.jar
commons-logging-1.2.jar
guava-11.0.2.jar
hadoop-common-2.7.2.jar
hadoop-mapreduce-client-core-2.7.2.jar
JRE System Library [JavaSE-1.7]