I get an error stating- Hadoop: «ERROR : JAVA_HOME is not set». How to resolve this?

0 votes

I'm trying to install Hadoop on Ubuntu 11.10. I set the JAVA_HOME variable in the file conf/hadoop-env.sh to:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

and then I execute these commands (Standalone Operation):

$ mkdir input 
$ cp conf/*.xml input 
$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+' 
$ cat output/*

but I have the following error when executing the third command:

ERROR : JAVA_HOME is not set

Is the JAVA_HOME variable not set correctly?

Aug 7, 2018 in Big Data Hadoop by Neha
• 6,280 points
446 views

1 answer to this question.

0 votes

Make sure that you have removed the comment tag and changed your JAVA_HOME in the hadoop-env.sh as well as the appropriate .bashrc and/or .profile:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

should be

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

You can set your JAVA_HOME and PATH for all users (make sure you haven't previously set this to the wrong path) in /etc/profile.

Also, don't forget to activate the new change by logging-out/in or by executing source /etc/profile.

You should set JAVA_HOME in the hadoop-env.sh file also which is in the Hadoop configuration directory. By default, the JAVA_HOME setting line is commented.

answered Aug 7, 2018 by Frankie
• 9,810 points

Related Questions In Big Data Hadoop

0 votes
1 answer

Hadoop: localhost: Error: JAVA_HOME is not set.

Seems like PATH problem in hadoop-env.sh file. Try ...READ MORE

answered Nov 6, 2018 in Big Data Hadoop by Omkar
• 67,660 points
594 views
0 votes
11 answers
0 votes
1 answer

In Hadoop MapReduce, how can i set an Object as the Value for Map output?

Try this and see if it works: public ...READ MORE

answered Nov 20, 2018 in Big Data Hadoop by Omkar
• 67,660 points
39 views
+1 vote
1 answer

Hadoop: "DEPRECATED: Use of this script to execute hdfs command is deprecated." error

The use of dfs in your command is "Deprecated". ...READ MORE

answered Nov 26, 2018 in Big Data Hadoop by Omkar
• 67,660 points
863 views
0 votes
1 answer
0 votes
1 answer

Moving files in Hadoop using the Java API?

I would recommend you to use FileSystem.rename(). ...READ MORE

answered Apr 15, 2018 in Big Data Hadoop by Shubham
• 13,300 points
903 views
0 votes
1 answer

Hadoop giving java.io.IOException, in mkdir Java code.

I am not sure about the issue. ...READ MORE

answered May 3, 2018 in Big Data Hadoop by Shubham
• 13,300 points
480 views
0 votes
1 answer

How to run Map Reduce program using Ubuntu terminal?

 I used the following steps to execute it ...READ MORE

answered Aug 7, 2018 in Big Data Hadoop by Neha
• 6,280 points
183 views
0 votes
1 answer

How do I get connected to Hadoop and Geo Spatial connector?

There are a number of free and ...READ MORE

answered Aug 13, 2018 in Big Data Hadoop by Frankie
• 9,810 points
253 views
0 votes
1 answer