java操作hdfs java.lang.NoClassDefFoundError: org/apache/hadoop/fs/CanUnbuffer

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<dependency>

<groupId>org.apache.hadoop</groupId>

<artifactId>hadoop-hdfs</artifactId>

<version>2.7.7</version>

</dependency>

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Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/CanUnbuffer

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)

at java.net.URLClassLoader.access$100(URLClassLoader.java:74)

at java.net.URLClassLoader$1.run(URLClassLoader.java:369)

at java.net.URLClassLoader$1.run(URLClassLoader.java:363)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:362)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)

at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)

at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)

at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2625)

at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2607)

at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)

at HandleHDFSFile.main(HandleHDFSFile.java:31)

Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.fs.CanUnbuffer

at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 19 more