DataBinder uses a default limit of 256 for array/collection auto-growing (SPR-7842)

org.springframework.context/src/main/java/org/springframework/validation/BeanPropertyBindingResult.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -47,6 +47,8 @@ public class BeanPropertyBindingResult extends AbstractPropertyBindingResult imp
 
 	private final boolean autoGrowNestedPaths;
 
+	private final int autoGrowCollectionLimit;
+
 	private transient BeanWrapper beanWrapper;
 
 
@@ -56,7 +58,7 @@ public class BeanPropertyBindingResult extends AbstractPropertyBindingResult imp
 	 * @param objectName the name of the target object
 	 */
 	public BeanPropertyBindingResult(Object target, String objectName) {
-		this(target, objectName, true);
+		this(target, objectName, true, Integer.MAX_VALUE);
 	}
 
 	/**
@@ -64,11 +66,13 @@ public class BeanPropertyBindingResult extends AbstractPropertyBindingResult imp
 	 * @param target the target bean to bind onto
 	 * @param objectName the name of the target object
 	 * @param autoGrowNestedPaths whether to "auto-grow" a nested path that contains a null value
+	 * @param autoGrowCollectionLimit the limit for array and collection auto-growing
 	 */
-	public BeanPropertyBindingResult(Object target, String objectName, boolean autoGrowNestedPaths) {
+	public BeanPropertyBindingResult(Object target, String objectName, boolean autoGrowNestedPaths, int autoGrowCollectionLimit) {
 		super(objectName);
 		this.target = target;
 		this.autoGrowNestedPaths = autoGrowNestedPaths;
+		this.autoGrowCollectionLimit = autoGrowCollectionLimit;
 	}
 
 
@@ -88,6 +92,7 @@ public class BeanPropertyBindingResult extends AbstractPropertyBindingResult imp
 			this.beanWrapper = createBeanWrapper();
 			this.beanWrapper.setExtractOldValueForEditor(true);
 			this.beanWrapper.setAutoGrowNestedPaths(this.autoGrowNestedPaths);
+			this.beanWrapper.setAutoGrowCollectionLimit(this.autoGrowCollectionLimit);
 		}
 		return this.beanWrapper;
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -105,6 +105,9 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 	/** Default object name used for binding: "target" */
 	public static final String DEFAULT_OBJECT_NAME = "target";
 
+	/** Default limit for array and collection growing: 256 */
+	public static final int DEFAULT_AUTO_GROW_COLLECTION_LIMIT = 256;
+
 
 	/**
 	 * We'll create a lot of DataBinder instances: Let's use a static logger.
@@ -127,6 +130,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 
 	private boolean autoGrowNestedPaths = true;
 
+	private int autoGrowCollectionLimit = DEFAULT_AUTO_GROW_COLLECTION_LIMIT;
+
 	private String[] allowedFields;
 
 	private String[] disallowedFields;
@@ -199,6 +204,22 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 		return this.autoGrowNestedPaths;
 	}
 
+	/**
+	 * Specify the limit for array and collection auto-growing.
+	 * <p>Default is 256, preventing OutOfMemoryErrors in case of large indexes.
+	 * Raise this limit if your auto-growing needs are unusually high.
+	 */
+	public void setAutoGrowCollectionLimit(int autoGrowCollectionLimit) {
+		this.autoGrowCollectionLimit = autoGrowCollectionLimit;
+	}
+
+	/**
+	 * Return the current limit for array and collection auto-growing.
+	 */
+	public int getAutoGrowCollectionLimit() {
+		return this.autoGrowCollectionLimit;
+	}
+
 	/**
 	 * Initialize standard JavaBean property access for this DataBinder.
 	 * <p>This is the default; an explicit call just leads to eager initialization.
@@ -207,7 +228,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 	public void initBeanPropertyAccess() {
 		Assert.state(this.bindingResult == null,
 				"DataBinder is already initialized - call initBeanPropertyAccess before other configuration methods");
-		this.bindingResult = new BeanPropertyBindingResult(getTarget(), getObjectName(), isAutoGrowNestedPaths());
+		this.bindingResult = new BeanPropertyBindingResult(
+				getTarget(), getObjectName(), isAutoGrowNestedPaths(), getAutoGrowCollectionLimit());
 		if (this.conversionService != null) {
 			this.bindingResult.initConversion(this.conversionService);
 		}