Instalacja Javy na Systemie Centos 8

Napisano 7 stycznia 2020 przez Linux

Poniższy poradnik opisuje instalację Javy w kilku wersjach : Oracle Java 8, OpenJDK 8, OpenJDK 11
Na serwerze z systemem Centos 8.
Całość sprowadza się do wykonania kilku komend.

Na początek dokonamy przeszukania repo.
Całość wykonamy poleceniem:

 dnf search jdk

1	dnf search jdk

Otrzymamy wynik podobny do tego:

 Last metadata expiration check: 1:23:41 ago on Wednesday 30 December 2019 02:23:23 AM EST. ========================================================= Summary & Name Matched: jdk ========================================================= java-11-openjdk-demo.x86_64 : OpenJDK Demos 11 java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos 8 java-11-openjdk-jmods.x86_64 : JMods for OpenJDK 11 java-11-openjdk-src.x86_64 : OpenJDK Source Bundle 11 java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle 8 java-11-openjdk.x86_64 : OpenJDK Runtime Environment 11 copy-jdk-configs.noarch : JDKs configuration files copier java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment 8 java-11-openjdk-javadoc.x86_64 : OpenJDK 11 API documentation java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation java-11-openjdk-devel.x86_64 : OpenJDK Development Environment 11 java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment 8 java-11-openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment 11 java-1.8.0-openjdk-accessibility.x86_64 : OpenJDK 8 accessibility connector java-1.8.0-openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment 8 java-11-openjdk-javadoc-zip.x86_64 : OpenJDK 11 API documentation compressed in a single archive java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed in a single archive ============================================================ Summary Matched: jdk ============================================================= icedtea-web.noarch : Additional Java components for OpenJDK - Java browser plug-in and Web Start implementation

Last metadata expiration check:1:23:41ago on Wednesday30December201902:23:23AM EST.

=========================================================Summary&Name Matched:jdk=========================================================

java-11-openjdk-demo.x86_64:OpenJDK Demos11

java-1.8.0-openjdk-demo.x86_64:OpenJDK Demos8

java-11-openjdk-jmods.x86_64:JMods forOpenJDK11

java-11-openjdk-src.x86_64:OpenJDK Source Bundle11

java-1.8.0-openjdk-src.x86_64:OpenJDK Source Bundle8

java-11-openjdk.x86_64:OpenJDK Runtime Environment11

copy-jdk-configs.noarch:JDKs configuration files copier

java-1.8.0-openjdk.x86_64:OpenJDK Runtime Environment8

java-11-openjdk-javadoc.x86_64:OpenJDK11API documentation

java-1.8.0-openjdk-javadoc.noarch:OpenJDK8API documentation

java-11-openjdk-devel.x86_64:OpenJDK Development Environment11

java-1.8.0-openjdk-devel.x86_64:OpenJDK Development Environment8

java-11-openjdk-headless.x86_64:OpenJDK Headless Runtime Environment11

java-1.8.0-openjdk-accessibility.x86_64:OpenJDK8accessibility connector

java-1.8.0-openjdk-headless.x86_64:OpenJDK Headless Runtime Environment8

java-11-openjdk-javadoc-zip.x86_64:OpenJDK11API documentation compressed inasingle archive

java-1.8.0-openjdk-javadoc-zip.noarch:OpenJDK8API documentation compressed inasingle archive

============================================================Summary Matched:jdk=============================================================

icedtea-web.noarch:Additional Java components forOpenJDK-Java browser plug-inandWeb Start implementation

Instalacja OpenJDK 11

 dnf install java-11-openjdk-devel.x86_64

1	dnf install java-11-openjdk-devel.x86_64

Wersję javy możemy sprawdzić poleceniem:

 java -version

1	java-version

Poniżej wynik:

 openjdk version "11.0.5" 2019-10-15 LTS OpenJDK Runtime Environment 18.9 (build 11.0.5+10-LTS) OpenJDK 64-Bit Server VM 18.9 (build 11.0.5+10-LTS, mixed mode, sharing)

openjdk version"11.0.5"2019-10-15LTS

OpenJDK Runtime Environment18.9(build11.0.5+10-LTS)

OpenJDK64-Bit Server VM18.9(build11.0.5+10-LTS,mixed mode,sharing)

Instalacja OpenJDK 8

 dnf install java-1.8.0-openjdk-devel

1	dnf install java-1.8.0-openjdk-devel

Sprawdzenie wersji:

 java -version

1	java-version

Wynik:

 openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)

openjdk version"1.8.0_232"

OpenJDK Runtime Environment(build1.8.0_232-b09)

OpenJDK64-Bit Server VM(build25.232-b09,mixed mode)

Aby przełączyć się między wersjami Java wykonujemy polecenie:

 alternatives --config java

1	alternatives--config java

I wybieramy wersję odpowiednim numerem:

 There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- 1 java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.el8_0.x86_64/bin/java) *+ 2 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el8_0.x86_64/jre/bin/java) Enter to keep the current selection[+], or type selection number: 1

There are2programs which provide'java'.

Selection Command

-----------------------------------------------

1 java-11-openjdk.x86_64(/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.el8_0.x86_64/bin/java)

*+2 java-1.8.0-openjdk.x86_64(/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el8_0.x86_64/jre/bin/java)

Enter tokeep the current selection[+],ortype selection number:1

Instalacja Oracle Java 8

 dnf localinstall jdk-8u231-linux-x64.rpm

1	dnf localinstall jdk-8u231-linux-x64.rpm

No i standardowo sprawdzenie wersji:

 java -version java version "1.8.0_231" Java(TM) SE Runtime Environment (build 1.8.0_231-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

java-version

java version"1.8.0_231"

Java(TM)SE Runtime Environment(build1.8.0_231-b11)