Polish DataBinder.

spring-context/src/main/java/org/springframework/validation/DataBinder.java

@@ -116,6 +116,7 @@
  * @author Stephane Nicoll
  * @author Kazuki Shimizu
  * @author Sam Brannen
+ * @author Mengqi Xu
  * @see #setAllowedFields
  * @see #setRequiredFields
  * @see #registerCustomEditor
@@ -1087,7 +1088,13 @@ private boolean hasValuesFor(String paramPath, ValueResolver resolver) {
 			if (name.startsWith(paramPath + "[")) {
 				int endIndex = name.indexOf(']', paramPath.length() + 1);
 				String rawIndex = name.substring(paramPath.length() + 1, endIndex);
-				int index = Integer.parseInt(rawIndex);
+				int index;
+				try {
+					index = Integer.parseInt(rawIndex);
+				}
+				catch (NumberFormatException ex) {
+					throw new IllegalArgumentException("Failed to parse index from '" + rawIndex + "'", ex);
+				}
 				indexes = (indexes != null ? indexes : new TreeSet<>());
 				indexes.add(index);
 			}

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinderTests.java

@@ -34,11 +34,13 @@
 import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /**
  * Test fixture for {@link ExtendedServletRequestDataBinder}.
  *
  * @author Rossen Stoyanchev
+ * @author Mengqi Xu
  */
 class ExtendedServletRequestDataBinderTests {
 
@@ -90,6 +92,31 @@ void createBinderViaConstructor() {
 		assertThat(bean.someIntArray()).containsExactly(1, 2);
 	}
 
+	@Test  // gh-34205
+	void createBinderViaConstructorWithInvalidIndex() {
+		request.addParameter("Some-Int-Array[foo]", "1");
+
+		ServletRequestDataBinder binder = new ExtendedServletRequestDataBinder(null);
+		binder.setTargetType(ResolvableType.forClass(DataBean.class));
+		binder.setNameResolver(new BindParamNameResolver());
+
+		assertThatThrownBy(() -> binder.construct(request))
+				.isInstanceOf(IllegalArgumentException.class)
+				.hasMessage("Failed to parse index from 'foo'");
+	}
+
+	@Test  // gh-34205
+	void createBinderViaConstructorWithChooseConstructor() {
+		request.addParameter("Some-Int-Array[0]", "1");
+
+		ServletRequestDataBinder binder = new ExtendedServletRequestDataBinder(null);
+		binder.setTargetType(ResolvableType.forClass(DataBean.class));
+		binder.setNameResolver(new BindParamNameResolver());
+		assertThatThrownBy(() -> binder.construct(request))
+				.isInstanceOf(IllegalStateException.class)
+				.hasMessage("No primary or single unique constructor found for class java.lang.Integer");
+	}
+
 	@Test
 	void uriVarsAndHeadersAddedConditionally() {
 		request.addParameter("name", "John");