Add non-headless java.desktop integration test

Author: thomaswue

substratevm/mx.substratevm/mx_substratevm.py

@@ -255,7 +255,7 @@ def _is_post_merge_or_weekly_job():
     return 'post-merge' in build_name or 'weekly' in build_name
 
 
-def _should_run_headless_java_desktop_integration():
+def _should_run_java_desktop_integration():
     tags = tuple(Task.tags or ())
     return _is_post_merge_or_weekly_job() or any(tag == GraalTags.headless_java_desktop_integration for tag in tags)
 
@@ -523,13 +523,13 @@ def svm_gate_body(args, tasks):
             with native_image_context(IMAGE_ASSERTION_FLAGS):
                 native_unittests_task(args.extra_image_builder_arguments)
 
-    with Task('Headless java.desktop integration test', tasks, tags=[GraalTags.headless_java_desktop_integration]) as t:
-        if t and _should_run_headless_java_desktop_integration():
+    with Task('java.desktop integration tests', tasks, tags=[GraalTags.headless_java_desktop_integration]) as t:
+        if t and _should_run_java_desktop_integration():
             if mx.is_windows():
                 mx.warn('Headless java.desktop integration test does not run on Windows')
             else:
                 with native_image_context(IMAGE_ASSERTION_FLAGS):
-                    headless_java_desktop_integration_task(args.extra_image_builder_arguments)
+                    java_desktop_integration_task(args.extra_image_builder_arguments)
 
     with Task('conditional configuration tests', tasks, tags=[GraalTags.condconfig]) as t:
         if t:
@@ -757,12 +757,13 @@ def native_unittests_task(extra_build_args=None):
     native_image_context_run(_native_unittest, computed)
 
 
-def headless_java_desktop_integration_task(extra_build_args=None):
+def java_desktop_integration_task(extra_build_args=None):
     extra_build_args = list(extra_build_args or [])
     build_args = extra_build_args + svm_experimental_options(['-H:Preserve=module=java.desktop'])
     native_unittest([
         '--test-classes-per-run', '1',
         'com.oracle.svm.integrationtest.HeadlessJavaDesktopTest',
+        'com.oracle.svm.integrationtest.NonHeadlessJavaDesktopTest',
         '--build-args',
     ] + build_args)
 

substratevm/src/com.oracle.svm.test/src/com/oracle/svm/integrationtest/NonHeadlessJavaDesktopTest.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2026, 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.svm.integrationtest;
+
+import java.awt.AWTError;
+import java.awt.Dimension;
+import java.awt.GraphicsEnvironment;
+import java.awt.HeadlessException;
+import java.awt.Toolkit;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+
+import javax.imageio.ImageIO;
+
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.Test;
+
+public class NonHeadlessJavaDesktopTest {
+    @Test
+    public void nonHeadlessJavaDesktopSmokeTest() throws Exception {
+        String osName = System.getProperty("os.name", "");
+        Assume.assumeTrue(osName.startsWith("Linux"));
+
+        String display = System.getenv("DISPLAY");
+        Assume.assumeTrue(display != null && !display.isEmpty());
+
+        System.clearProperty("java.awt.headless");
+        Toolkit toolkit;
+        Dimension screenSize;
+        try {
+            Assume.assumeFalse(GraphicsEnvironment.isHeadless());
+            toolkit = Toolkit.getDefaultToolkit();
+            screenSize = toolkit.getScreenSize();
+        } catch (AWTError | HeadlessException e) {
+            Assume.assumeNoException(e);
+            return;
+        }
+        Assert.assertTrue("Invalid screen width: " + screenSize.width, screenSize.width > 0);
+        Assert.assertTrue("Invalid screen height: " + screenSize.height, screenSize.height > 0);
+
+        BufferedImage image = new BufferedImage(4, 4, BufferedImage.TYPE_INT_ARGB);
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        Assert.assertTrue("No PNG writer available", ImageIO.write(image, "png", output));
+
+        byte[] bytes = output.toByteArray();
+        Assert.assertTrue("PNG output is empty", bytes.length > 8);
+        Assert.assertEquals((byte) 0x89, bytes[0]);
+        Assert.assertEquals((byte) 'P', bytes[1]);
+        Assert.assertEquals((byte) 'N', bytes[2]);
+        Assert.assertEquals((byte) 'G', bytes[3]);
+    }
+}