Install Java OpenJDK or Oracle JDK for Java 7 or 8, the JRE version is not sufficient.
```
sudo apt-get install openjdk-8-jdk
# for centos
# sudo yum install java-1.8.0-openjdk
```
- Note: on Centos/RHEL you may need to install java-1.8.0-openjdk-devel if you get complaints about missing javac or javadoc
Check which versions of Java are installed and pick a 1.7 or greater.
```
sudo update-alternatives --config java
```
Set JAVA_HOME env var. Don't include the /bin folder in the path. This can be problematic so if you get complaints about JAVA_HOME you may need to change xxx-env.sh depending on which service complains. For instance hbase-env.sh has a JAVA_HOME setting if HBase complains when starting.
```
vim /etc/environment
# add the following
export JAVA_HOME=/path/to/open/jdk/jre
# some would rather add JAVA_HOME to /home/aml/.bashrc
```

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