How to set JAVA_HOME correctly on CentOS?

Question

I am trying to set JAVA_HOME so that I can install Apache Solr with the help of this tutorial. I am connected to my server using ssh with root user

To allow the running sh script to install Apache Solr:

mount | grep noexec

Re-mounting file system with exec option:

mount -o remount,exec /dev/md1

Then every time I try to install it using the following commands

bin/install_solr_service.sh /tmp/solr-5.3.1.tgz

I get the following message:

WARNING: /opt/solr-5.3.1 already exists! Skipping extract ...

Creating /etc/init.d/solr script ...
The currently defined JAVA_HOME (/usr/local/jdk) refers
to a location where Java could not be found.  Aborting.
Either fix the JAVA_HOME variable or remove it from the
environment so that the system PATH will be searched.
The currently defined JAVA_HOME (/usr/local/jdk) refers
to a location where Java could not be found.  Aborting.
Either fix the JAVA_HOME variable or remove it from the
environment so that the system PATH will be searched.
Service solr installed.

This is what I tried so far:

nano /root/.bash_profile 
nano /etc/profile

I added the following to the files above at the end and saved them

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64
export PATH=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/bin:$PATH

That didn't work.

I created the following file /etc/profile.d/java.sh and put in it:

export JRE_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/
export PATH=$PATH:$JRE_HOME/bin

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64
export JAVA_PATH=$JAVA_HOME

export PATH=$PATH:$JAVA_HOME/bin

And ran the following command:

source java.sh

That also didn't work.

I tried to run the following command:

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64

No luck at all.

But when a run the following commands that is what I get

echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64
echo $PATH
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/bin:/usr/local/jdk/bin:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre//bin:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/bin:/usr/local/bin:/usr/X11R6/bin:/root/bin

andrej · Answer

find java install directory first

# type java
java is /usr/bin/java

# ls -l /usr/bin/java
lrwxrwxrwx. 1 root root 22 Jul 24 17:48 /usr/bin/java -> /etc/alternatives/java

# ls -l /etc/alternatives/java
lrwxrwxrwx. 1 root root 44 Jul 24 17:48 /etc/alternatives/java -> /usr/lib/jvm/adoptopenjdk-8-hotspot/bin/java

export string is export JAVA_HOME="/usr/lib/jvm/adoptopenjdk-8-hotspot/"
put export string at the end of the /etc/profile
put export string at the end of the /etc/bashrc
open new session and test your JAVA_HOME settings through echo $JAVA_HOME

Sam · Answer

Rather than copying out files from the installation directory it would be better to set the SOLR_JAVA_HOME in /etc/default/solr.in.sh to the location of the jre folder in your installation such as usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/

Answered by Sam on January 3, 2022

Waqleh · Answer

I was reading my question and found the answer in it. This is what I have done:

I have undone all the changes to /root/.bash_profile and /etc/profile

Then I created a folder called jdk in the /usr/local/ folder like so

mkdir /usr/local/jdk

Since this is were the jdk is expected to be located in. Then I copied the jdk files to that newcp -R /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/* /usr/local/jdk/ folder like so:

cp -R /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/* /usr/local/jdk/

As simple as that I was now able to install Apache Solr

Rui F Ribeiro · Answer

You want to point JAVA_HOME to the JRE directory, as in:
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/jre/

If using bash, I recommend putting this in /etc/bashrc (RH based) or /etc/bash.bashrc (Debian based):
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:/bin/java::")

How to set JAVA_HOME correctly on CentOS?

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