Yadda ake Shigar Java tare da Apt akan Ubuntu 20.04

Java tana ɗaya daga cikin shahararrun yarukan shirye-shirye kuma JVM (Java ta kama-da-wane inji) shine yanayin tafiyar lokaci don gudanar da aikace-aikacen Java. Ana buƙatar waɗannan dandamali guda biyu don shahararrun software waɗanda suka haɗa da Tomcat, Jetty, Cassandra, Glassfish, da Jenkins.

A cikin wannan labarin, zaku koyi yadda ake girka Java Runtime Environment (JRE) da kuma Java Developer Kit (JDK) ta amfani da tsoffin manajan kunshin a Ubuntu 20.04 da Ubuntu 18.04.

Shigar da Tsoffin JRE a Ubuntu

Hanya mara zafi don girka Java ita ce amfani da sigar da ta zo tare da wuraren ajiya na Ubuntu. Ta hanyar tsoho, fakitin Ubuntu tare da OpenJDK 11, wanda shine madadin-tushen tushen JRE da JDK.

Don shigar da tsoho Buɗe JDK 11, da farko sabunta abin da ke kunshin software:

$ sudo apt update

Na gaba, bincika shigarwar Java akan tsarin.

$ java -version

Idan ba a girka Java ba a halin yanzu, zaku sami fitarwa mai zuwa.

Command 'java' not found, but can be installed with:

sudo apt install openjdk-11-jre-headless  # version 11.0.10+9-0ubuntu1~20.04, or
sudo apt install default-jre              # version 2:1.11-72
sudo apt install openjdk-8-jre-headless   # version 8u282-b08-0ubuntu1~20.04
sudo apt install openjdk-13-jre-headless  # version 13.0.4+8-1~20.04
sudo apt install openjdk-14-jre-headless  # version 14.0.2+12-1~20.04

Yanzu aiwatar da umarni mai zuwa don shigar da tsoho OpenJDK 11, wanda zai samar da Yanayin Ruwan Java (JRE).

$ sudo apt install default-jre

Da zarar an shigar Java, zaka iya tabbatar da shigarwa tare da:

$ java -version

Za ku sami fitarwa mai zuwa:

openjdk version "11.0.10" 2021-01-19
OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)

Shigar da Tsoffin JDK a Ubuntu

Da zarar an shigar da JRE, kuna iya buƙatar JDK (Java Development Kit) don tattarawa da gudanar da aikace-aikacen Java. Don shigar da JDK, gudanar da umarni mai zuwa.

$ sudo apt install default-jdk

Bayan shigarwa, tabbatar da shigarwar JDK ta hanyar duba sigar kamar yadda aka nuna.

$ javac -version

Za ku sami fitarwa mai zuwa:

javac 11.0.10

Saitin Yanayin JAVA_HOME Mai Sauya a Ubuntu

Yawancin shirye-shiryen software na tushen Java suna amfani da canjin yanayi na JAVA_HOME don gano wurin shigar Java.

Don saita yanayin canjin yanayi na JAVA_HOME, da farko, gano inda aka sanya Java ta hanyar aiwatar da umarni mai zuwa.

$ readlink -f /usr/bin/java

Za ku sami fitarwa mai zuwa:

/usr/lib/jvm/java-11-openjdk-amd64/bin/java

Sannan buɗe/sauransu/yanayin muhalli ta amfani da editan rubutu na Nano:

$ sudo nano /etc/environment

Sanya layi mai zuwa a karshen fayil din, tabbatar ka maye gurbin wurin hanyar shigarka ta Java.

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64"

Adana fayil ɗin kuma sake shigar da fayil ɗin don amfani da canje-canje ga zamanku na yanzu:

$ source /etc/environment

Tabbatar cewa an saita canjin yanayi:

$ echo $JAVA_HOME

Za ku sami fitarwa mai zuwa:

/usr/lib/jvm/java-11-openjdk-amd64

A cikin wannan darasin, kun koyi yadda ake girka Java Runtime Environment (JRE) da Java Developer Kit (JDK) akan Ubuntu 20.04 da Ubuntu 18.04.