Unable to start the cluster process while installing Hadoop

[DataFlair Team]

Team please help me to start the cluster.
I am getting below error while executing below commands:
bin/hdfs namenode -format : Error-/usr/lib/jvn/java-8-oracle//bin/java: No such file or directory

sbin/start-dfs.sh:
Error- /home/hdadmin/hadoop-2.5.0-cdh5.3.2/bin/hdfs: line 301: /usr/lib/jvn/java-8-oracle//bin/java: No such file or directory
Starting namenodes on []
localhost: starting namenode, logging to /home/hdadmin/hadoop-2.5.0-cdh5.3.2/logs/hadoop-hdadmin-namenode-ubuntu.out
localhost: /home/hdadmin/hadoop-2.5.0-cdh5.3.2/bin/hdfs: line 301: /usr/lib/jvn/java-8-oracle//bin/java: No such file or directory
localhost: starting datanode, logging to /home/hdadmin/hadoop-2.5.0-cdh5.3.2/logs/hadoop-hdadmin-datanode-ubuntu.out
localhost: /home/hdadmin/hadoop-2.5.0-cdh5.3.2/bin/hdfs: line 301: /usr/lib/jvn/java-8-oracle//bin/java: No such file or directory
/home/hdadmin/hadoop-2.5.0-cdh5.3.2/bin/hdfs: line 301: /usr/lib/jvn/java-8-oracle//bin/java: No such file or directory

[DataFlair Team]

Change JAVA_HOME variable in conf/hadoop-env.sh

export JAVA_HOME=/usr/lib/jvn/java-8-oracle//bin/java

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