Don't limit collection sizes in property binding

Update PropertiesConfigurationFactory so that collections can grow
beyond 256 items. Prior to this commit configuration property binding
used the default `DataBinder.autoGrowNestedPaths` setting of 256.

Fixes gh-6436

spring-boot/src/main/java/org/springframework/boot/bind/PropertiesConfigurationFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 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.
@@ -259,6 +259,7 @@ public class PropertiesConfigurationFactory<T>
 		if (this.conversionService != null) {
 			dataBinder.setConversionService(this.conversionService);
 		}
+		dataBinder.setAutoGrowCollectionLimit(Integer.MAX_VALUE);
 		dataBinder.setIgnoreNestedProperties(this.ignoreNestedProperties);
 		dataBinder.setIgnoreInvalidFields(this.ignoreInvalidFields);
 		dataBinder.setIgnoreUnknownFields(this.ignoreUnknownFields);

spring-boot/src/test/java/org/springframework/boot/context/properties/EnableConfigurationPropertiesTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 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.
@@ -210,6 +210,19 @@ public class EnableConfigurationPropertiesTests {
 		assertEquals(2, this.context.getBean(TestProperties.class).getList().size());
 	}
 
+	@Test
+	public void testCollectionPropertiesBindingWithOver256Elements() {
+		this.context.register(TestConfiguration.class);
+		List<String> pairs = new ArrayList<String>();
+		pairs.add("name:foo");
+		for (int i = 0; i < 1000; i++) {
+			pairs.add("list[" + i + "]:" + i);
+		}
+		EnvironmentTestUtils.addEnvironment(this.context, pairs.toArray(new String[] {}));
+		this.context.refresh();
+		assertEquals(1000, this.context.getBean(TestProperties.class).getList().size());
+	}
+
 	@Test
 	public void testPropertiesBindingWithoutAnnotation() {
 		this.context.register(InvalidConfiguration.class);