(HBase) Error: JAVA_HOME is not set and Java could not be found

Question

I have read some comments about setting JAVA_HOME. As I am a beginner in this,I did not edit anything without any knowledge of what I was doing. I did not want to mess things up more than this. So if you can guide me through this and tell me what is wrong with my coding, I would really appreciate it.

I have been trying to install Hadoop and then HBase. After a lot of difficulties and error solving, I could finally install Hadoop, and get the this output when I ran start-all.sh and everything seemed to be fine.

> hduser@CSLAP106:~$ /usr/local/hadoop/bin/start-all.sh

> hduser@CSLAP106:~$ jps

> 3005 NameNode

> 3404 JobTracker

> 5570 Jps

> 3554 TaskTracker

> 3311 SecondaryNameNode

I also have this Java Version and when I type echo JAVA_HOME, I get this output:

> hduser@CSLAP106:~$ java -version 
> 
> java version "1.7.0_25" OpenJDK Runtime Environment (IcedTea 2.3.12)
> (7u25-2.3.12-4ubuntu3)   OpenJDK Server VM (build 23.7-b01, mixed
> mode) 
> hduser@CSLAP106:~$ echo JAVA_HOME JAVA_HOME

After this, I tried to install HBase (which I think I am about to give up on), and constantly I get the error that JAVA_HOME is not set and java cannot be found

This is what I tried to start Hbase:

hduser@CSLAP106:~$ /usr/local/hbase/hbase-0.94.6.1/bin/start-hbase.sh
+======================================================================+
|      Error: JAVA_HOME is not set and Java could not be found         |
+----------------------------------------------------------------------+
| Please download the latest Sun JDK from the Sun Java web site        |
|       > http://java.sun.com/javase/downloads/ <                      |
|                                                                      |
| HBase requires Java 1.6 or later.                                    |
| NOTE: This script will find Sun Java whether you install using the   |
|       binary or the RPM based installer.                             |
+======================================================================+

I also check in this directory /usr/local/hbase/hbase-0.94.6.1/bin to see if it recognizes Java or not, and it does!

After searching through Strackoverflow and other people's answers to the same problem, I tried to apply them to my .xml and .sh files, but again nothing happened.

For HADOOP

this is the hadoop-env.sh in which I set the JAVA_HOME:

# The java implementation to use.  Required.
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386

This is the editing for my $HOME/.bashrc :

# Set Hadoop-related environment variables
export HADOOP_HOME=/usr/local/hadoop

export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-i386

# Add Hadoop bin/ directory to PATH

export PATH=$PATH:$HADOOP_HOME/bin

For HBase

These are the edits I have made in hbase-site.xml

<property>
        <name>hbase.rootdir</name>
    <value>hdfs://localhost:54310 /hbase</value>
</property>

This is for the hbase-env.sh

# The java implementation to use.  Java 1.6 required.
# export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-i386

This is all I guess.

Answer 1

Apparently the HBase could not find JAVA_HOME and java binary although you can run java -version locally.

You should run export JAVA_HOME=/the/path/of/you/jdk/ before running HBase.

BTY, echo JAVA_HOME JAVA_HOME is incorrect. You may want echo $JAVA_HOME.