BeanWrapper avoids StringIndexOutOfBoundsException for incompletely quoted keys

Issue: SPR-14293
(cherry picked from commit cf0a0cd)

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

@@ -800,7 +800,7 @@ public abstract class AbstractNestablePropertyAccessor extends AbstractPropertyA
 
 	/**
 	 * Recursively navigate to return a property accessor for the nested property path.
-	 * @param propertyPath property property path, which may be nested
+	 * @param propertyPath property path, which may be nested
 	 * @return a property accessor for the target bean
 	 */
 	@SuppressWarnings("unchecked")  // avoid nested generic
@@ -942,7 +942,8 @@ public abstract class AbstractNestablePropertyAccessor extends AbstractPropertyA
 						actualName = propertyName.substring(0, keyStart);
 					}
 					String key = propertyName.substring(keyStart + PROPERTY_KEY_PREFIX.length(), keyEnd);
-					if ((key.startsWith("'") && key.endsWith("'")) || (key.startsWith("\"") && key.endsWith("\""))) {
+					if (key.length() > 1 && (key.startsWith("'") && key.endsWith("'")) ||
+							(key.startsWith("\"") && key.endsWith("\""))) {
 						key = key.substring(1, key.length() - 1);
 					}
 					keys.add(key);

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -194,6 +194,19 @@ public class BeanWrapperTests extends AbstractPropertyAccessorTests {
 		assertEquals("x", accessor.getPropertyValue("object.name"));
 	}
 
+	@Test
+	public void incompletelyQuotedKeyLeadsToPropertyException() {
+		TestBean target = new TestBean();
+		try {
+			BeanWrapper accessor = createAccessor(target);
+			accessor.setPropertyValue("[']", "foobar");
+			fail("Should throw exception on invalid property");
+		}
+		catch (NotWritablePropertyException ex) {
+			assertNull(ex.getPossibleMatches());
+		}
+	}
+
 
 	@SuppressWarnings("unused")
 	private static class GetterBean {
@@ -212,6 +225,7 @@ public class BeanWrapperTests extends AbstractPropertyAccessorTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntelliBean {