openjdk: drop gtk2 support

pkgs/development/compilers/openjdk/8/patches/swing-use-gtk-jdk8.patch

@@ -1,26 +0,0 @@
-diff -ru3 a/jdk/src/share/classes/javax/swing/UIManager.java b/jdk/src/share/classes/javax/swing/UIManager.java
---- a/jdk/src/share/classes/javax/swing/UIManager.java	2016-07-26 00:41:37.000000000 +0300
-+++ b/jdk/src/share/classes/javax/swing/UIManager.java	2016-10-02 22:46:01.890071761 +0300
-@@ -607,11 +607,9 @@
-         if (osType == OSInfo.OSType.WINDOWS) {
-             return "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
-         } else {
--            String desktop = AccessController.doPrivileged(new GetPropertyAction("sun.desktop"));
-             Toolkit toolkit = Toolkit.getDefaultToolkit();
--            if ("gnome".equals(desktop) &&
--                    toolkit instanceof SunToolkit &&
--                    ((SunToolkit) toolkit).isNativeGTKAvailable()) {
-+            if (toolkit instanceof SunToolkit &&
-+                    ((SunToolkit) toolkit).isNativeGTKAvailable()) {
-                 // May be set on Linux and Solaris boxs.
-                 return "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
-             }
-@@ -1341,7 +1339,7 @@
-             lafName = (String) lafData.remove("defaultlaf");
-         }
-         if (lafName == null) {
--            lafName = getCrossPlatformLookAndFeelClassName();
-+            lafName = getSystemLookAndFeelClassName();
-         }
-         lafName = swingProps.getProperty(defaultLAFKey, lafName);
- 

pkgs/development/compilers/openjdk/generic.nix

@@ -69,7 +69,6 @@
 
   enableGtk ? true,
   gtk3,
-  gtk2,
   glib,
 
   temurin-bin-8,
@@ -88,6 +87,9 @@
     .${featureVersion},
 }:
 
+assert lib.assertMsg (enableGtk -> lib.versionAtLeast featureVersion "11")
+  "GTK support in OpenJDK requires version 11.x or newer, because earlier versions would depend on GTK 2.";
+
 let
   sourceFile = ./. + "/${featureVersion}/source.json";
   source = nixpkgs-openjdk-updater.openjdkSource {
@@ -227,12 +229,7 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   ++ lib.optionals (!headless && enableGtk) [
     (
-      if atLeast17 then
-        ./17/patches/swing-use-gtk-jdk13.patch
-      else if atLeast11 then
-        ./11/patches/swing-use-gtk-jdk10.patch
-      else
-        ./8/patches/swing-use-gtk-jdk8.patch
+      if atLeast17 then ./17/patches/swing-use-gtk-jdk13.patch else ./11/patches/swing-use-gtk-jdk10.patch
     )
   ]
   ++ lib.optionals (featureVersion == "11") [
@@ -300,7 +297,7 @@ stdenv.mkDerivation (finalAttrs: {
     lcms2
   ]
   ++ lib.optionals (!headless && enableGtk) [
-    (if atLeast11 then gtk3 else gtk2)
+    gtk3
     glib
   ];
 
@@ -602,7 +599,7 @@ stdenv.mkDerivation (finalAttrs: {
     inherit jdk-bootstrap;
     inherit (source) updateScript;
   }
-  // (if atLeast11 then { inherit gtk3; } else { inherit gtk2; })
+  // lib.optionalAttrs atLeast11 { inherit gtk3; }
   // lib.optionalAttrs (!atLeast23) {
     inherit architecture;
   };

pkgs/top-level/java-packages.nix

@@ -32,7 +32,14 @@ in
         featureVersion:
         let
           openjdkLinux =
-            (callPackage ../development/compilers/openjdk/generic.nix { inherit featureVersion; })
+            (callPackage ../development/compilers/openjdk/generic.nix (
+              {
+                inherit featureVersion;
+              }
+              // lib.optionalAttrs (lib.versionOlder featureVersion "11") {
+                enableGtk = false;
+              }
+            ))
             // {
               headless = mergeMetaPlatforms openjdkLinuxHeadless openjdkDarwin;
             };