Merge branch '4.0.x'

Closes gh-48976

buildSrc/src/main/java/org/springframework/boot/build/EclipseConventions.java

@@ -50,15 +50,27 @@ class EclipseConventions {
 	}
 
 	private DomainObjectCollection<JavaBasePlugin> configure(Project project, EclipsePlugin eclipsePlugin) {
+		TaskProvider<?> synchronizeResourceSettings = registerEclipseSynchronizeResourceSettings(project);
 		TaskProvider<?> synchronizeJdtSettings = registerEclipseSynchronizeJdtSettings(project);
 		return project.getPlugins().withType(JavaBasePlugin.class, (javaBase) -> {
 			EclipseModel model = project.getExtensions().getByType(EclipseModel.class);
-			model.synchronizationTasks(synchronizeJdtSettings);
+			model.synchronizationTasks(synchronizeResourceSettings, synchronizeJdtSettings);
 			model.jdt(this::configureJdt);
 			model.classpath(this::configureClasspath);
 		});
 	}
 
+	private TaskProvider<?> registerEclipseSynchronizeResourceSettings(Project project) {
+		TaskProvider<EclipseSynchronizeResourceSettings> eclipseSynchronizateResource = project.getTasks()
+			.register("eclipseSynchronizateResourceSettings", EclipseSynchronizeResourceSettings.class);
+		eclipseSynchronizateResource.configure((task) -> {
+			task.setDescription("Synchronizate the Eclipse resource settings file from Buildship.");
+			task.setOutputFile(project.file(".settings/org.eclipse.core.resources.prefs"));
+			task.setInputFile(project.file(".settings/org.eclipse.core.resources.prefs"));
+		});
+		return eclipseSynchronizateResource;
+	}
+
 	private TaskProvider<EclipseSynchronizeJdtSettings> registerEclipseSynchronizeJdtSettings(Project project) {
 		TaskProvider<EclipseSynchronizeJdtSettings> taskProvider = project.getTasks()
 			.register("eclipseSynchronizeJdtSettings", EclipseSynchronizeJdtSettings.class);

buildSrc/src/main/java/org/springframework/boot/build/EclipseSynchronizeResourceSettings.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.build;
+
+import java.util.Properties;
+
+import org.gradle.api.Task;
+import org.gradle.api.internal.PropertiesTransformer;
+import org.gradle.plugins.ide.api.PropertiesGeneratorTask;
+
+import org.springframework.boot.build.EclipseSynchronizeResourceSettings.Configuration;
+
+/**
+ * {@link Task} to synchronize Eclipse resource settings.
+ *
+ * @author Phillip Webb
+ */
+public abstract class EclipseSynchronizeResourceSettings extends PropertiesGeneratorTask<Configuration> {
+
+	@Override
+	protected Configuration create() {
+		return new Configuration(getTransformer());
+	}
+
+	@Override
+	protected void configure(Configuration configuration) {
+	}
+
+	public static class Configuration extends EmptyPropertiesPersistableConfigurationObject {
+
+		Configuration(PropertiesTransformer transformer) {
+			super(transformer);
+		}
+
+		@Override
+		protected void store(Properties properties) {
+			properties.put("encoding/<project>", "UTF-8");
+		}
+
+	}
+
+}