Defined Type: alternatives::java

Defined in:
modules/alternatives/manifests/java.pp

Overview

Define: alternatives::java

Debian's alternatives system uses symlinks to refer generic commands to a particular implementation. This Puppet resource lets you specify a value for a particular alternative in the specific case of the JVM (several binaries are shipped with openjdk for example, it is better to keep them all aligned with /usr/bin/java).

Note: when checking if a Java version is already set correctly, we need to fall back to update-alternatives, since update-java-alternatives provides only a -l method to list available options, not the one currently set.

Parameters

title

The number of the Java version to set as default.

Examples

alternatives::java { '11': }


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# File 'modules/alternatives/manifests/java.pp', line 22

define alternatives::java {

    # The following two paths are needed since update-alternatives lists
    # the java paths using the java-$version format, meanwhile
    # update-java-alternatives follows the java-1.$version.0 format.
    # There seems to be no way to use update-java-alternatives to get
    # the current path set as default, hence we need to use update-alternatives.
    $update_alternatives_path = "/usr/lib/jvm/java-${title}-openjdk-amd64"
    $update_java_alternatives_path = "/usr/lib/jvm/java-1.${title}.0-openjdk-amd64"

    exec { "update_java_alternatives_${title}":
        command => "/usr/sbin/update-java-alternatives -s ${update_java_alternatives_path}",
        unless  => "/usr/bin/update-alternatives --query java | /bin/grep 'Value: ${update_alternatives_path}'",
    }
}