连接到hadoop时，出现以下错误
线程“main”java.lang.abstractmethoderror中出现异常：org.apache.hadoop.hdfs.server.namenode.ha.configuredfailoverproxyprovider.getproxy（）lorg/apache/hadoop/io/retry/failoverproxyprovider$proxyinfo；在org.apache.hadoop.io.retry.retryinvocationhandler。java:73)在org.apache.hadoop.io.retry.retryinvocationhandler。java:64)在org.apache.hadoop.io.retry.retryproxy.create（retryproxy。java:58)在org.apache.hadoop.hdfs.namenodeproxies.createproxy（namenodeproxies。java:147)在org.apache.hadoop.hdfs.dfsclient.（dfsclient。java:510)在org.apache.hadoop.hdfs.dfsclient。java:453)位于org.apache.hadoop.hdfs.distributedfilesystem.initialize（distributedfilesystem）。java:136)在org.apache.hadoop.fs.filesystem.createfilesystem（filesystem。java:2653)在org.apache.hadoop.fs.filesystem.access$200（文件系统）。java:92)在org.apache.hadoop.fs.filesystem$cache.getinternal（文件系统）。java:2687)在org.apache.hadoop.fs.filesystem$cache.get（filesystem。java:2669)在org.apache.hadoop.fs.filesystem.get（filesystem。java:371)在org.apache.hadoop.fs.filesystem.get（filesystem。java:170)在hrumen.htest.main（htest。java:26)
下面是我的代码：

***Path corepath = new Path("/var/tmp/hactive/core-site.xml");

        Path sitepath = new Path("/var/tmp/hactive/hdfs-site.xml");
        Path yarnpath = new Path("/var/tmp/hactive/yarn-site.xml");
        Path mapredpath = new Path("/var/tmp/hactive/mapred-site.xml");

        Configuration hconf = new Configuration();
        hconf.addResource(corepath);
        hconf.addResource(sitepath);
        hconf.addResource(yarnpath);
        hconf.addResource(mapredpath);

        try{
            DFSAdmin dfadmin = new DFSAdmin(hconf);
            dfadmin.report();

        }
        catch(Exception e){
            //System.out.println("[Exception]: "+e);
            e.printStackTrace();
        }***

这里是hdfs-site.xml的一部分

...
    <property>
        <name>dfs.nameservices</name>
        <value>mycluster</value>
        <final>true</final>

    </property>
....

    <property>
        <name>dfs.client.failover.proxy.provider.mycluster</name>
        <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
    </property>

在core-site.xml中

<property>
    <name>fs.defaultFS</name>
    <value>hdfs://mycluster</value>
</property>

....