diff --git a/manifests/init.pp b/manifests/init.pp
index d0427402..2fce729e 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -26,7 +26,8 @@
 # @param java_package
 #   Java package name, only used when `java_declare_method` is `class`
 # @param java_home
-#   Java home path, only used when `java_declare_method` is `class`
+#   Java home path.  This value is used when `java_declare_method` is `class`
+#   as well as to set JAVA_HOME environment variable for the Keycloak service.
 # @param java_alternative_path
 #   Java alternative path, only used when `java_declare_method` is `class`
 # @param java_alternative
diff --git a/spec/classes/init_spec.rb b/spec/classes/init_spec.rb
index 96180a1c..7bf21866 100644
--- a/spec/classes/init_spec.rb
+++ b/spec/classes/init_spec.rb
@@ -183,6 +183,16 @@
             )
           end
         end
+
+        context 'when java_home defined' do
+          let(:params) { { java_home: '/foo' } }
+
+          it do
+            is_expected.to contain_systemd__unit_file('keycloak.service').with(
+              content: %r{Environment='JAVA_HOME=/foo'},
+            )
+          end
+        end
       end
     end
   end
diff --git a/templates/keycloak.service.erb b/templates/keycloak.service.erb
index eeac048d..88d8a0c5 100644
--- a/templates/keycloak.service.erb
+++ b/templates/keycloak.service.erb
@@ -17,6 +17,7 @@ Environment='JAVA_OPTS_APPEND=<%= scope['keycloak::java_opts'].join(' ') %>'
 Environment='JAVA_OPTS_APPEND=<%= scope['keycloak::java_opts'] %>'
   <%- end -%>
 <% end -%>
+Environment='JAVA_HOME=<%= scope['keycloak::java_home'] %>'
 User=<%= scope['keycloak::user'] %>
 Group=<%= scope['keycloak::group'] %>
 ExecStart=<%= scope['keycloak::service_start_cmd'] %>