Transparently handle migration from number to java.util.Duration

See gh-11794

spring-boot-project/spring-boot-properties-migrator/src/main/java/org/springframework/boot/context/properties/migrator/PropertiesMigrationReporter.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.context.properties.migrator;
 
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashMap;
@@ -108,21 +109,42 @@ class PropertiesMigrationReporter {
 			ConfigurationMetadataProperty replacement = this.allProperties
 					.get(replacementId);
 			if (replacement != null) {
-				return replacement.getType().equals(metadata.getType());
-			}
-			replacement = getMapProperty(replacementId);
-			if (replacement != null) {
-				return replacement.getType().startsWith("java.util.Map")
-						&& replacement.getType().endsWith(metadata.getType() + ">");
+				return isCompatibleType(metadata.getType(), replacement.getType());
 			}
+			return isCompatibleType(metadata.getType(),
+					detectMapValueReplacementType(replacementId));
+		}
+		return false;
+	}
+
+	private boolean isCompatibleType(String currentType, String replacementType) {
+		if (replacementType ==  null || currentType == null) {
+			return false;
+		}
+		if (replacementType.equals(currentType)) {
+			return true;
+		}
+		if (replacementType.equals(Duration.class.getName())
+				&& (currentType.equals(Long.class.getName())
+				|| currentType.equals(Integer.class.getName()))) {
+			return true;
 		}
 		return false;
 	}
 
-	private ConfigurationMetadataProperty getMapProperty(String fullId) {
+	private String detectMapValueReplacementType(String fullId) {
 		int i = fullId.lastIndexOf('.');
 		if (i != -1) {
-			return this.allProperties.get(fullId.substring(0, i));
+			ConfigurationMetadataProperty property = this.allProperties.get(
+					fullId.substring(0, i));
+			String type = property.getType();
+			if (type != null
+					&& type.startsWith(Map.class.getName())) {
+				int lastComma = type.lastIndexOf(',');
+				if (lastComma != -1) {
+					return type.substring(lastComma + 1, type.length() - 1).trim();
+				}
+			}
 		}
 		return null;
 	}

spring-boot-project/spring-boot-properties-migrator/src/test/java/org/springframework/boot/context/properties/migrator/PropertiesMigrationReporterTests.java

@@ -18,7 +18,9 @@ package org.springframework.boot.context.properties.migrator;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.junit.Test;
 
@@ -29,6 +31,7 @@ import org.springframework.boot.env.PropertiesPropertySourceLoader;
 import org.springframework.boot.origin.Origin;
 import org.springframework.boot.origin.OriginLookup;
 import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
 import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.env.PropertySource;
 import org.springframework.core.env.PropertySources;
@@ -115,6 +118,29 @@ public class PropertiesMigrationReporterTests {
 				.doesNotContain("debug");
 	}
 
+	@Test
+	public void durationTypeIsHandledTransparently() {
+		MutablePropertySources propertySources = this.environment.getPropertySources();
+		Map<String, Object> content = new LinkedHashMap<>();
+		content.put("test.cache-seconds", 50);
+		content.put("test.time-to-live-ms", 1234L);
+		content.put("test.ttl", 5678L);
+		propertySources.addFirst(
+				new MapPropertySource("test", content));
+		assertThat(propertySources).hasSize(2);
+		String report = createWarningReport(
+				loadRepository("metadata/type-conversion-metadata.json"));
+		assertThat(report).contains("Property source 'test'", "test.cache-seconds",
+				"test.cache", "test.time-to-live-ms", "test.time-to-live", "test.ttl",
+				"test.mapped.ttl");
+		assertThat(mapToNames(propertySources)).containsExactly("migrate-test", "test",
+				"mockProperties");
+		PropertySource<?> propertySource = propertySources.get("migrate-test");
+		assertMappedProperty(propertySource, "test.cache", 50, null);
+		assertMappedProperty(propertySource, "test.time-to-live", 1234L, null);
+		assertMappedProperty(propertySource, "test.mapped.ttl", 5678L, null);
+	}
+
 	private List<String> mapToNames(PropertySources sources) {
 		List<String> names = new ArrayList<>();
 		for (PropertySource<?> source : sources) {

spring-boot-project/spring-boot-properties-migrator/src/test/resources/metadata/type-conversion-metadata.json

@@ -0,0 +1,40 @@
+{
+  "properties": [
+    {
+      "name": "test.cache",
+      "type": "java.time.Duration"
+    },
+    {
+      "name": "test.time-to-live",
+      "type": "java.time.Duration"
+    },
+    {
+      "name": "test.mapped",
+      "type": "java.util.Map<java.lang.String, java.time.Duration>"
+    },
+    {
+      "name": "test.cache-seconds",
+      "type": "java.lang.Integer",
+      "deprecation": {
+        "replacement": "test.cache",
+        "level": "error"
+      }
+    },
+    {
+      "name": "test.time-to-live-ms",
+      "type": "java.lang.Long",
+      "deprecation": {
+        "replacement": "test.time-to-live",
+        "level": "error"
+      }
+    },
+    {
+      "name": "test.ttl",
+      "type": "java.lang.Long",
+      "deprecation": {
+        "replacement": "test.mapped.ttl",
+        "level": "error"
+      }
+    }
+  ]
+}