Support char primitive default values in BeanUtils.instantiateClass()

Closes gh-27390

Author: sbrannen

spring-beans/src/main/java/org/springframework/beans/BeanUtils.java

@@ -87,9 +87,10 @@ public abstract class BeanUtils {
 		values.put(byte.class, (byte) 0);
 		values.put(short.class, (short) 0);
 		values.put(int.class, 0);
-		values.put(long.class, (long) 0);
-		values.put(float.class, (float) 0);
-		values.put(double.class, (double) 0);
+		values.put(long.class, 0L);
+		values.put(float.class, 0F);
+		values.put(double.class, 0D);
+		values.put(char.class, '\0');
 		DEFAULT_TYPE_VALUES = Collections.unmodifiableMap(values);
 	}
 

spring-beans/src/test/java/org/springframework/beans/BeanUtilsTests.java

@@ -98,30 +98,31 @@ void instantiateClassWithMoreArgsThanParameters() throws NoSuchMethodException {
 		Constructor<BeanWithPrimitiveTypes> constructor = getBeanWithPrimitiveTypesConstructor();
 
 		assertThatExceptionOfType(BeanInstantiationException.class).isThrownBy(() ->
-				BeanUtils.instantiateClass(constructor, null, null, null, null, null, null, null, "foo", null));
+				BeanUtils.instantiateClass(constructor, null, null, null, null, null, null, null, null, "foo", null));
 	}
 
 	@Test  // gh-22531, gh-27390
 	void instantiateClassWithOptionalPrimitiveTypes() throws NoSuchMethodException {
 		Constructor<BeanWithPrimitiveTypes> constructor = getBeanWithPrimitiveTypesConstructor();
 
-		BeanWithPrimitiveTypes bean = BeanUtils.instantiateClass(constructor, null, null, null, null, null, null, null, "foo");
+		BeanWithPrimitiveTypes bean = BeanUtils.instantiateClass(constructor, null, null, null, null, null, null, null, null, "foo");
 
 		assertSoftly(softly -> {
-			softly.assertThat(bean.isFlag()).isEqualTo(false);
+			softly.assertThat(bean.isFlag()).isFalse();
 			softly.assertThat(bean.getByteCount()).isEqualTo((byte) 0);
 			softly.assertThat(bean.getShortCount()).isEqualTo((short) 0);
 			softly.assertThat(bean.getIntCount()).isEqualTo(0);
 			softly.assertThat(bean.getLongCount()).isEqualTo(0L);
 			softly.assertThat(bean.getFloatCount()).isEqualTo(0F);
 			softly.assertThat(bean.getDoubleCount()).isEqualTo(0D);
+			softly.assertThat(bean.getCharacter()).isEqualTo('\0');
 			softly.assertThat(bean.getText()).isEqualTo("foo");
 		});
 	}
 
 	private Constructor<BeanWithPrimitiveTypes> getBeanWithPrimitiveTypesConstructor() throws NoSuchMethodException {
 		return BeanWithPrimitiveTypes.class.getConstructor(boolean.class, byte.class, short.class, int.class,
-				long.class, float.class, double.class, String.class);
+				long.class, float.class, double.class, char.class, String.class);
 	}
 
 	@Test
@@ -659,19 +660,22 @@ private static class BeanWithPrimitiveTypes {
 		private long longCount;
 		private float floatCount;
 		private double doubleCount;
+		private char character;
 		private String text;
 
 
 		@SuppressWarnings("unused")
 		public BeanWithPrimitiveTypes(boolean flag, byte byteCount, short shortCount, int intCount, long longCount,
-				float floatCount, double doubleCount, String text) {
+				float floatCount, double doubleCount, char character, String text) {
+
 			this.flag = flag;
 			this.byteCount = byteCount;
 			this.shortCount = shortCount;
 			this.intCount = intCount;
 			this.longCount = longCount;
 			this.floatCount = floatCount;
 			this.doubleCount = doubleCount;
+			this.character = character;
 			this.text = text;
 		}
 
@@ -703,6 +707,10 @@ public double getDoubleCount() {
 			return doubleCount;
 		}
 
+		public char getCharacter() {
+			return character;
+		}
+
 		public String getText() {
 			return text;
 		}