Getting error in JAVA HOME variable

Question

I added JAVA_HOME & Java path in my .bashrc file. I can see the value once I execute the following command:

$ echo $JAVA_HOME
/usr/lib/jdk/java-8-openjdk/

I have also added my JAVA_HOME in hadoop-env.sh file.

export JAVA_HOME="/usr/lib/jdk/java-8-openjdk/"

But still when I am executing the hadoop namenode -format, I am getting the below error

$ hadoop namenode -format

Warning: $HADOOP_HOME is deprecated.
/usr/bin/hadoop: line 320: /usr/lib/jdk/java-8-openjdk/bin/java: No such file or directory
/usr/bin/hadoop: line 390: /usr/lib/jdk/java-8-openjdk/bin/java: No such file or directory

Answer 1

First of all check the hadoop version command in the shell. It should give you the version of Hadoop. If you are not getting the output and giving you the Java error, possible reasons can be: check your OS is 32 or 64 bit and then check the Java, is it 32 or 64.

Go ahead and verify the Java path in both bashrc file as well as hadoop-env.sh file. If the problem still persists, kindly try installing JAVA via alternatives.