Add jdk16 support (qzind#823)

* Add jigsaw "--add-opens" options for Java 9+
* Temporarily disable Darcula on JDK16+

ant/project.properties

@@ -9,6 +9,7 @@ project.datadir=qz
 
 install.opts=-Djna.nosys=true
 launch.opts=-Xms512m ${install.opts}
+launch.jigsaw=--add-opens java.desktop/sun.lwawt.macosx=ALL-UNNAMED --add-opens java.desktop/java.awt=ALL-UNNAMED
 launch.overrides=QZ_OPTS
 
 src.dir=${basedir}/src

ant/unix/unix-launcher.sh.in

@@ -87,6 +87,14 @@ else
     echo -e "$SUCCESS Java $curver was detected"
 fi
 
+jigsaw=$(echo -e "9.0\n$curver")
+actual=$(echo "$jigsaw" |sort -t '.' -k 1,1 -k 2,2 -n)
+if [ "$jigsaw" != "$actual" ]; then
+    echo -e "$SUCCESS Java < 9.0, skipping jigsaw options"
+else
+    echo -e "$SUCCESS Java >= 9.0, adding jigsaw options"
+    LAUNCH_OPTS="$LAUNCH_OPTS ${launch.jigsaw}"
+fi
 
 if command -v java &>/dev/null; then
     echo -e "$ABOUT_TITLE is starting..."

src/qz/utils/SystemUtilities.java

@@ -370,11 +370,15 @@ public static boolean prefersMaskTrayIcon() {
     public static boolean setSystemLookAndFeel() {
         try {
             UIManager.getDefaults().put("Button.showMnemonics", Boolean.TRUE);
-            boolean darkulaThemeNeeded = true;
+            boolean darculaThemeNeeded = true;
             if(!isMac() && (isUnix() && UbuntuUtilities.isDarkMode())) {
-                darkulaThemeNeeded = false;
+                darculaThemeNeeded = false;
             }
-            if(isDarkDesktop() && darkulaThemeNeeded) {
+            // Disable darcula on JDK16+ per https://github.com/bobbylight/Darcula/issues/8
+            if(Constants.JAVA_VERSION.greaterThanOrEqualTo(Version.valueOf("16.0.0"))) {
+                darculaThemeNeeded = false;
+            }
+            if(isDarkDesktop() && darculaThemeNeeded) {
                 UIManager.setLookAndFeel("com.bulenkov.darcula.DarculaLaf");
             } else {
                 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());