Mark private classes final

See gh-1479

spring-xml/src/main/java/org/springframework/xml/validation/Jaxp13ValidatorFactory.java

@@ -48,7 +48,7 @@ abstract class Jaxp13ValidatorFactory {
 		}
 	}
 
-	private static class Jaxp13Validator implements XmlValidator {
+	private static final class Jaxp13Validator implements XmlValidator {
 
 		private Schema schema;
 
@@ -82,7 +82,7 @@ abstract class Jaxp13ValidatorFactory {
 	/**
 	 * {@code ErrorHandler} implementation that stores errors and fatal errors in a list.
 	 */
-	private static class DefaultValidationErrorHandler implements ValidationErrorHandler {
+	private static final class DefaultValidationErrorHandler implements ValidationErrorHandler {
 
 		private List<SAXParseException> errors = new ArrayList<>();
 

spring-xml/src/main/java/org/springframework/xml/validation/Jaxp15ValidatorFactory.java

@@ -56,7 +56,7 @@ abstract class Jaxp15ValidatorFactory {
 		}
 	}
 
-	private static class Jaxp15Validator implements XmlValidator {
+	private static final class Jaxp15Validator implements XmlValidator {
 
 		private Schema schema;
 
@@ -111,7 +111,7 @@ abstract class Jaxp15ValidatorFactory {
 	/**
 	 * {@code ErrorHandler} implementation that stores errors and fatal errors in a list.
 	 */
-	private static class DefaultValidationErrorHandler implements ValidationErrorHandler {
+	private static final class DefaultValidationErrorHandler implements ValidationErrorHandler {
 
 		private List<SAXParseException> errors = new ArrayList<>();
 

spring-xml/src/main/java/org/springframework/xml/xpath/AbstractXPathTemplate.java

@@ -60,7 +60,7 @@ public abstract class AbstractXPathTemplate extends TransformerObjectSupport imp
 	 * Static inner class that adapts a {@link NodeCallbackHandler} to the interface of
 	 * {@link NodeMapper}.
 	 */
-	private static class NodeCallbackHandlerNodeMapper implements NodeMapper<Object> {
+	private static final class NodeCallbackHandlerNodeMapper implements NodeMapper<Object> {
 
 		private final NodeCallbackHandler callbackHandler;
 

spring-xml/src/main/java/org/springframework/xml/xpath/JaxenXPathExpressionFactory.java

@@ -75,7 +75,7 @@ abstract class JaxenXPathExpressionFactory {
 	}
 
 	/** Jaxen implementation of the {@code XPathExpression} interface. */
-	private static class JaxenXpathExpression implements XPathExpression {
+	private static final class JaxenXpathExpression implements XPathExpression {
 
 		private XPath xpath;
 

spring-xml/src/main/java/org/springframework/xml/xpath/Jaxp13XPathExpressionFactory.java

@@ -90,7 +90,7 @@ abstract class Jaxp13XPathExpressionFactory {
 	}
 
 	/** JAXP 1.3 implementation of the {@code XPathExpression} interface. */
-	private static class Jaxp13XPathExpression implements XPathExpression {
+	private static final class Jaxp13XPathExpression implements XPathExpression {
 
 		private final javax.xml.xpath.XPathExpression xpathExpression;
 

spring-xml/src/main/java/org/springframework/xml/xpath/Jaxp13XPathTemplate.java

@@ -164,7 +164,7 @@ public class Jaxp13XPathTemplate extends AbstractXPathTemplate {
 		return this.xpathFactory.newXPath();
 	}
 
-	private static class EvaluationCallback implements TraxUtils.SourceCallback {
+	private static final class EvaluationCallback implements TraxUtils.SourceCallback {
 
 		private final XPath xpath;
 

spring-xml/src/main/java/org/springframework/xml/xsd/commons/CommonsXsdSchemaCollection.java

@@ -236,7 +236,7 @@ public class CommonsXsdSchemaCollection implements XsdSchemaCollection, Initiali
 		return builder.toString();
 	}
 
-	private class ClasspathUriResolver extends DefaultURIResolver {
+	private final class ClasspathUriResolver extends DefaultURIResolver {
 
 		@Override
 		public InputSource resolveEntity(String namespace, String schemaLocation, String baseUri) {

spring-xml/src/test/java/org/springframework/xml/validation/XmlValidatorFactoryTest.java

@@ -56,7 +56,7 @@ public class XmlValidatorFactoryTest {
 			.createValidator(new ClassPathResource("schema.xsd", AbstractValidatorFactoryTest.class), "bla"));
 	}
 
-	private static class NonExistentResource extends AbstractResource {
+	private static final class NonExistentResource extends AbstractResource {
 
 		@Override
 		public Resource createRelative(String relativePath) throws IOException {