Housecleaning of build warnings

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/orm/HibernateNativeQueryProvider.java

@@ -33,7 +33,7 @@ import org.springframework.util.StringUtils;
  * 
  * @param <E> entity returned by executing the query
  */
-public class HibernateNativeQueryProvider<E> extends AbstractHibernateQueryProvider {
+public class HibernateNativeQueryProvider<E> extends AbstractHibernateQueryProvider<E> {
 
 	private String sqlQuery;
 
@@ -46,7 +46,8 @@ public class HibernateNativeQueryProvider<E> extends AbstractHibernateQueryProvi
 	 * </p>
 	 */
     @Override
-	public NativeQuery createQuery() {
+	@SuppressWarnings("unchecked")
+	public NativeQuery<E> createQuery() {
 
 		if (isStatelessSession()) {
 			return getStatelessSession().createNativeQuery(sqlQuery).addEntity(entityClass);

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/mapping/BeanWrapperFieldSetMapper.java

@@ -402,7 +402,7 @@ public class BeanWrapperFieldSetMapper<T> extends DefaultPropertyEditorRegistrar
 	 * Public setter for the 'conversionService' property.
 	 * {@link #createBinder(Object)} will use it if not null.
 	 *
-	 * @param conversionService
+	 * @param conversionService {@link ConversionService} to be used for type conversions
 	 */
 	public void setConversionService(ConversionService conversionService) {
 		this.conversionService = conversionService;

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/transform/AbstractLineTokenizer.java

@@ -20,6 +20,8 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import org.springframework.util.StringUtils;
+
 /**
  * Abstract class handling common concerns of various {@link LineTokenizer}
  * implementations such as dealing with names and actual construction of
@@ -80,7 +82,22 @@ public abstract class AbstractLineTokenizer implements LineTokenizer {
 	 * @param names names of each column
 	 */
 	public void setNames(String... names) {
-		this.names = names==null ? null : Arrays.asList(names).toArray(new String[names.length]);
+		if(names == null) {
+			this.names = null;
+		}
+		else {
+			boolean valid = false;
+			for (String name : names) {
+				if(StringUtils.hasText(name)) {
+					valid = true;
+					break;
+				}
+			}
+
+			if(valid) {
+				this.names = Arrays.asList(names).toArray(new String[names.length]);
+			}
+		}
 	}
 
 	/**

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/builder/SynchronizedItemStreamReaderBuilder.java

@@ -40,7 +40,7 @@ public class SynchronizedItemStreamReaderBuilder<T> {
 	 * @return this instance for method chaining
 	 * @see SynchronizedItemStreamReader#setDelegate(ItemStreamReader)
 	 */
-	public SynchronizedItemStreamReaderBuilder delegate(ItemStreamReader<T> delegate) {
+	public SynchronizedItemStreamReaderBuilder<T> delegate(ItemStreamReader<T> delegate) {
 		this.delegate = delegate;
 
 		return this;