Adjust to JavaCore.defaultRootModules deprecation

Use the new method that filters based on the release. If release option
is not set, use target and if it's not there too use the latest version.

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/ModuleDependenciesPage.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019 GK Software SE, and others.
+ * Copyright (c) 2019, 2025 GK Software SE, and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -13,6 +13,7 @@
  *******************************************************************************/
 package org.eclipse.jdt.internal.ui.wizards.buildpaths;
 
+import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -26,8 +27,6 @@
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
-import java.text.MessageFormat;
-
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CTabFolder;
 import org.eclipse.swt.events.SelectionListener;
@@ -347,7 +346,14 @@ protected void scanModules() {
 						}
 						try {
 							if (fCurrJProject.getModuleDescription() == null) { // cache default roots when compiling the unnamed module:
-								fAllDefaultSystemModules= closure(JavaCore.defaultRootModules(Arrays.asList(fAllSystemRoots)));
+								String release = fCurrJProject.getOption(JavaCore.COMPILER_RELEASE, true);
+								if (release == null) {
+									release = fCurrJProject.getOption(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, true);
+								}
+								if (release == null) {
+									release = JavaCore.latestSupportedJavaVersion();
+								}
+								fAllDefaultSystemModules= closure(JavaCore.defaultRootModules(Arrays.asList(fAllSystemRoots), release));
 							}
 						} catch (JavaModelException e) {
 							JavaPlugin.log(e);

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/ModuleDialog.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2020 GK Software SE, and others.
+ * Copyright (c) 2017, 2025 GK Software SE, and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -799,11 +799,18 @@ private List<String> defaultIncludedModuleNamesForUnnamedModule() {
 		if (fJavaElements != null) {
 			List<IPackageFragmentRoot> roots= new ArrayList<>();
 			for (IJavaElement element : fJavaElements) {
-				if (element instanceof IPackageFragmentRoot) {
-					roots.add((IPackageFragmentRoot) element);
+				if (element instanceof IPackageFragmentRoot el) {
+					roots.add(el);
 				}
 			}
-			return JavaCore.defaultRootModules(roots);
+			String release = fJavaElements[0].getJavaProject().getOption(JavaCore.COMPILER_RELEASE, true);
+			if (release == null) {
+				release = fJavaElements[0].getJavaProject().getOption(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, true);
+			}
+			if (release == null) {
+				release = JavaCore.latestSupportedJavaVersion();
+			}
+			return JavaCore.defaultRootModules(roots, release);
 		}
 		return Collections.emptyList();
 	}