lenient property name casing, beyond standard JavaBeans conventions (SPR-6491)

org.springframework.beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java

@@ -22,6 +22,7 @@ import java.beans.Introspector;
 import java.beans.PropertyDescriptor;
 import java.lang.ref.Reference;
 import java.lang.ref.WeakReference;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -29,12 +30,12 @@ import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
 import java.util.WeakHashMap;
-import java.util.Collection;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.util.ClassUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * Internal class that caches JavaBeans {@link java.beans.PropertyDescriptor}
@@ -130,7 +131,7 @@ public class CachedIntrospectionResults {
 	 * @throws BeansException in case of introspection failure
 	 */
 	static CachedIntrospectionResults forClass(Class beanClass) throws BeansException {
-		CachedIntrospectionResults results = null;
+		CachedIntrospectionResults results;
 		Object value = classCache.get(beanClass);
 		if (value instanceof Reference) {
 			Reference ref = (Reference) value;
@@ -265,8 +266,15 @@ public class CachedIntrospectionResults {
 		return this.beanInfo.getBeanDescriptor().getBeanClass();
 	}
 
-	PropertyDescriptor getPropertyDescriptor(String propertyName) {
-		return this.propertyDescriptorCache.get(propertyName);
+	PropertyDescriptor getPropertyDescriptor(String name) {
+		PropertyDescriptor pd = this.propertyDescriptorCache.get(name);
+		if (pd == null && StringUtils.hasLength(name)) {
+			pd = this.propertyDescriptorCache.get(name.substring(0, 1).toLowerCase() + name.substring(1));
+			if (pd == null) {
+				pd = this.propertyDescriptorCache.get(name.substring(0, 1).toUpperCase() + name.substring(1));
+			}
+		}
+		return pd;
 	}
 
 	PropertyDescriptor[] getPropertyDescriptors() {

org.springframework.context/src/test/java/org/springframework/validation/DataBinderTests.java

@@ -625,6 +625,29 @@ public class DataBinderTests extends TestCase {
 		assertEquals("value", tb.getName());
 	}
 
+	public void testJavaBeanPropertyConventions() {
+		Book book = new Book();
+		DataBinder binder = new DataBinder(book);
+
+		MutablePropertyValues pvs = new MutablePropertyValues();
+		pvs.add("title", "my book");
+		pvs.add("ISBN", "1234");
+		pvs.add("NInStock", "5");
+		binder.bind(pvs);
+		assertEquals("my book", book.getTitle());
+		assertEquals("1234", book.getISBN());
+		assertEquals(5, book.getNInStock());
+
+		pvs = new MutablePropertyValues();
+		pvs.add("Title", "my other book");
+		pvs.add("iSBN", "6789");
+		pvs.add("nInStock", "0");
+		binder.bind(pvs);
+		assertEquals("my other book", book.getTitle());
+		assertEquals("6789", book.getISBN());
+		assertEquals(0, book.getNInStock());
+	}
+
 	public void testValidatorNoErrors() {
 		TestBean tb = new TestBean();
 		tb.setAge(33);
@@ -1336,6 +1359,40 @@ public class DataBinderTests extends TestCase {
 	}
 
 
+	private static class Book {
+
+		private String Title;
+
+		private String ISBN;
+
+		private int nInStock;
+
+		public String getTitle() {
+			return Title;
+		}
+
+		public void setTitle(String title) {
+			Title = title;
+		}
+
+		public String getISBN() {
+			return ISBN;
+		}
+
+		public void setISBN(String ISBN) {
+			this.ISBN = ISBN;
+		}
+
+		public int getNInStock() {
+			return nInStock;
+		}
+
+		public void setNInStock(int nInStock) {
+			this.nInStock = nInStock;
+		}
+	}
+
+
 	private static class TestBeanValidator implements Validator {
 
 		public boolean supports(Class clazz) {