Settings for Java

Target: being able to run Routeconverter

Following instructions are working on Fedora30 to run the file RouteConverterLinux.jar.

• Check wich version of Java is installed on the machine

  $ dnf list installed | grep java
  abrt-java-connector.x86_64                        1.1.2-1.fc30                           @updates                  
  java-1.8.0-openjdk-headless.x86_64                1:1.8.0.222.b10-0.fc30                 @updates                  
  javapackages-filesystem.noarch                    5.3.0-4.fc30                           @fedora                   
  tzdata-java.noarch                                2019b-1.fc30                           @updates 

  by me.

• Install java11

  $ sudo dnf install java-11-openjdk

  Now 2 versions of Java are present.
  By me, removing java-1.8.0 would remove things like OpenOffice due to dependencies ⇒ java-1.8.0 must stay on the machine.
  

• Check which version of Java is choosen per default

  $ java -version
  openjdk version "1.8.0_222"
  OpenJDK Runtime Environment (build 1.8.0_222-b10)
  OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode) 

• Switch to Version 11 per default by selecting “2”

  $ sudo alternatives --config java
  
  Il existe 2 programmes qui fournissent « java ».
  
    Sélection    Commande
  -----------------------------------------------
  *+ 1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.fc30.x86_64/jre/bin/java)
     2           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.4.11-0.fc30.x86_64/bin/java)
  
  Entrez pour garder la sélection courante [+] ou saisissez le numéro de type de sélection :2
  [arnaud@fedora-msi ~]$ java -version
  openjdk version "11.0.4" 2019-07-16
  OpenJDK Runtime Environment 18.9 (build 11.0.4+11)
  OpenJDK 64-Bit Server VM 18.9 (build 11.0.4+11, mixed mode, sharing) 

Now $ java -jar RouteConverterLinux.jar should start the script.