Johirul Islam Johirul Islam - 1 month ago 42
Java Question

java is not working in linux. Why?

Currently working on

Linux Cinnamon
. I have unistall/removed
Open JDK
from my local drive. Then I checked
java -version
via terminal and gives -

$ java -version
The program 'java' can be found in the following packages:
* default-jre
* gcj-5-jre-headless
* openjdk-8-jre-headless
* gcj-4.8-jre-headless
* gcj-4.9-jre-headless
* openjdk-9-jre-headless
Try: sudo apt install <selected package>


After that following the installation guide to install
oracle jdk 8
for
linux
. Then I just checked
java -version
command through [I just unpack
jdk
to
/opt/java
]-

$ /opt/java/jdk1.8.0_112/bin/java -version
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)


I set my environment variable
JAVA_HOME="/opt/java/jdk1.8.0_112"
[excluding
bin
] to
/etc/environment
using nano thereafter from JAVA_HOME setup tutorial -

# Java Home
JAVA_HOME="/opt/java/jdk1.8.0_112"
export JAVA_HOME


and refresh & checked my
JAVA_HOME
as follows -

$ echo $JAVA_HOME
/opt/java/jdk1.8.0_112


After these setup while I am trying check
java -version
via command it gives -

$ java -version
The program 'java' can be found in the following packages:
* default-jre
* gcj-5-jre-headless
* openjdk-8-jre-headless
* gcj-4.8-jre-headless
* gcj-4.9-jre-headless
* openjdk-9-jre-headless
Try: sudo apt install <selected package>


Can any tell me what is going on?

Answer

Even once you set $JAVA_HOME, you still need to add bin to your $PATH:

export PATH=$PATH:$JAVA_HOME/bin