Hadoop in maven eclipse

I worked on hadoop with maven plug-in in eclipse, when i run my program i got this error:

Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration$DeprecationDelta
at org.apache.hadoop.mapreduce.util.ConfigUtil.addDeprecatedKeys(ConfigUtil.java:54)
at org.apache.hadoop.mapreduce.util.ConfigUtil.loadResources(ConfigUtil.java:42)
at org.apache.hadoop.mapreduce.Job.(Job.java:107)
at org.apache.hadoop.PACT.Driver.main(Driver.java:17)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.conf.Configuration$DeprecationDelta
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 4 more

how can i solve this problem?