Grammar check in Emacs

e.g. langtool is Java package

java -version

openjdk version "1.8.0_151"
OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-1~deb9u1-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)

Java 7 is installed already

Where all stuff located on your system

which java

/usr/bin/java

it is /usr/local/java/, but in most cases it is absent in a file tree after when you're successfuly re-installing OS.

ls -la /usr/local/java/

ls: cannot access '/usr/local/java/': No such file or directory

Lets create it:

mkdir /usr/local/java
ls -la /usr/local/java/

mkdir: cannot create directory ‘/usr/local/java’: File exists
total 8
drwxr-sr-x  2 alioth staff 4096 Nov 20 12:59 .
drwxrwsr-x 12 root   staff 4096 Nov 20 12:59 ..

Now, when we're already prepared our system it is very time for the next step further.

Perfect, now it's time to determine an appropriate place to allocate your Java packages.

ls /usr/local/java

in zip archive from this site. 3.6 version seems compatible with Java 8 version installed on our host. Choose it and download zip archive.

into Java lib folder, in this particular case into /usr/local/java/

ls /usr/local/java/LanguageTool-3.6/

CHANGES.md
CHANGES.txt
COPYING.txt
languagetool-commandline.jar
languagetool.jar
languagetool-server.jar
libs
META-INF
org
README.md
testrules.bat
testrules.sh
third-party-licenses