Polish

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ExecutionContext.java

@@ -58,7 +58,8 @@ public class ExecutionContext implements Serializable {
 	}
 
 	/**
-	 * Initializes a new execution context with the contents of another executionContext.
+	 * Initializes a new {@link ExecutionContext} with the contents of another
+	 * {@code ExecutionContext}.
 	 *
 	 * @param executionContext containing the entries to be copied to this current context.
 	 */

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/KeyValueItemWriter.java

@@ -70,7 +70,7 @@ public abstract class KeyValueItemWriter<K, V> implements ItemWriter<V>, Initial
 	 * Sets the delete flag to have the item writer perform deletes
 	 *
 	 * @param delete if true {@link ItemWriter} will perform deletes,
-	 * if False not to perform deletes.
+	 * 		if false not to perform deletes.
 	 */
 	public void setDelete(boolean delete) {
 		this.delete = delete;

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/adapter/AbstractMethodInvokingDelegator.java

@@ -53,7 +53,7 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
 	 *
 	 * @return object returned by invoked method
 	 *
-	 * @throws Exception if the {@link MethodInvoker} used, throws an Exception.
+	 * @throws Exception exception thrown when executing the delegate method.
 	 */
 	protected T invokeDelegateMethod() throws Exception {
 		MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
@@ -67,7 +67,7 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
 	 * @param object argument for the target method
 	 * @return object returned by target method
 	 *
-	 * @throws Exception if the {@link MethodInvoker} used throws exception
+	 * @throws Exception exception thrown when executing the delegate method.
 	 */
 	protected T invokeDelegateMethodWithArgument(Object object) throws Exception {
 		MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
@@ -81,7 +81,7 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
 	 * @param args arguments for the invoked method
 	 * @return object returned by invoked method
 	 *
-	 * @throws Exception if the {@link MethodInvoker} used, throws an exception
+	 * @throws Exception exception thrown when executing the delegate method.
 	 */
 	protected T invokeDelegateMethodWithArguments(Object[] args) throws Exception {
 		MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);

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

@@ -42,7 +42,7 @@ public interface JpaQueryProvider {
     /**
      * Provide an {@link EntityManager} for the query to be built.
      * 
-     * @param entityManager to be used by the JpQueryProvider.
+     * @param entityManager to be used by the {@link JpaQueryProvider}.
      */
     void setEntityManager(EntityManager entityManager);
 

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

@@ -221,8 +221,7 @@ InitializingBean {
 	 * headerCallback will be called before writing the first item to file.
 	 * Newline will be automatically appended after the header is written.
 	 *
-	 * @param headerCallback {@link FlatFileHeaderCallback} to be used after
-	 * header is written.
+	 * @param headerCallback {@link FlatFileHeaderCallback} to generate the header
 	 *
 	 */
 	public void setHeaderCallback(FlatFileHeaderCallback headerCallback) {
@@ -233,8 +232,7 @@ InitializingBean {
 	 * footerCallback will be called after writing the last item to file, but
 	 * before the file is closed.
 	 *
-	 * @param footerCallback {@link FlatFileFooterCallback} to be used after
-	 * footer is written.
+	 * @param footerCallback {@link FlatFileFooterCallback} to generate the footer
 	 *
 	 */
 	public void setFooterCallback(FlatFileFooterCallback footerCallback) {

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

@@ -102,8 +102,8 @@ public class MultiResourceItemWriter<T> extends AbstractItemStreamItemWriter<T>
 	 * After this limit is exceeded the next chunk will be written into newly
 	 * created resource.
 	 *
-	 * @param itemCountLimitPerResource int containing the limit to determine
-	 * when the next chunk will be written to a newly created resource.
+	 * @param itemCountLimitPerResource int item threshold used to determine when a new
+	 * resource should be created.
 	 */
 	public void setItemCountLimitPerResource(int itemCountLimitPerResource) {
 		this.itemCountLimitPerResource = itemCountLimitPerResource;
@@ -133,8 +133,7 @@ public class MultiResourceItemWriter<T> extends AbstractItemStreamItemWriter<T>
 
 
 	/**
-	 * Establishes that state of each resource is saved to the context when
-	 * update is called.
+	 * Indicates that the state of the reader will be saved after each commit.
 	 *
 	 * @param saveState true the state is saved.
 	 */

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

@@ -44,7 +44,7 @@ public class SimpleBinaryBufferedReaderFactory implements BufferedReaderFactory
 	private String lineEnding = DEFAULT_LINE_ENDING;
 
 	/**
-	 * @param lineEnding {@link String} contains the line ending to use.
+	 * @param lineEnding {@link String} indicating what defines the end of a "line".
 	 */
 	public void setLineEnding(String lineEnding) {
 		this.lineEnding = lineEnding;

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

@@ -667,7 +667,7 @@ public class DefaultFieldSet implements FieldSet {
 
 	/**
 	 * Retrieve the index of where a specified column is located based on the
-	 * name parameter.
+	 * {@code name} parameter.
 	 *
 	 * @param name the value to search in the {@link List} of names.
 	 * @return the index in the {@link List} of names where the name was found.

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

@@ -1,4 +1,4 @@
-/*
+	/*
  * Copyright 2006-2007 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -59,15 +59,15 @@ public interface FieldSet {
 	 * @param index the field index.
 	 * @return {@link String} containing the value at the index.
 	 *
-	 * @throws IndexOutOfBoundsException if the index is out of bounds.
+	 * @throws IndexOutOfBoundsException if the {@code index} is out of bounds.
 	 */
 	String readString(int index);
 
 	/**
 	 * Read the {@link String} value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return {@link String} containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return {@link String} containing the value from the specified {@code name}.
 	 */
 	String readString(String name);
 
@@ -76,9 +76,9 @@ public interface FieldSet {
 	 * trailing whitespace (don't trim).
 	 * 
 	 * @param index the field index.
-	 * @return {@link String} containing the value from the specified index.
+	 * @return {@link String} containing the value from the specified {@code index}.
 	 *
-	 * @throws IndexOutOfBoundsException if the index is out of bounds.
+	 * @throws IndexOutOfBoundsException if the {@code index} is out of bounds.
 	 */
 	String readRawString(int index);
 
@@ -86,8 +86,8 @@ public interface FieldSet {
 	 * Read the {@link String} value from column with given '<code>name</code>'
 	 * including trailing whitespace (don't trim).
 	 * 
-	 * @param name the field name.
-	 * @return {@link String} containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return {@link String} containing the value from the specified {@code name}.
 	 */
 	String readRawString(String name);
 
@@ -95,19 +95,19 @@ public interface FieldSet {
 	 * Read the '<code>boolean</code>' value at index '<code>index</code>'.
 	 * 
 	 * @param index the field index.
-	 * @return boolean containing the value from the specified index.
+	 * @return boolean containing the value from the specified {@code index}.
 	 *
-	 * @throws IndexOutOfBoundsException if the index is out of bounds.
+	 * @throws IndexOutOfBoundsException if the {@code index} is out of bounds.
 	 */
 	boolean readBoolean(int index);
 
 	/**
 	 * Read the '<code>boolean</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return boolean containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return boolean containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	boolean readBoolean(String name);
@@ -118,7 +118,7 @@ public interface FieldSet {
 	 * @param index the field index.
 	 * @param trueValue the value that signifies {@link Boolean#TRUE true};
 	 * case-sensitive.
-	 * @return boolean containing the value from the specified index.
+	 * @return boolean containing the value from the specified {@code index}.
 	 *
 	 * @throws IndexOutOfBoundsException if the index is out of bounds, or if
 	 * the supplied <code>trueValue</code> is <code>null</code>.
@@ -128,12 +128,12 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>boolean</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param trueValue the value that signifies {@link Boolean#TRUE true};
 	 * case-sensitive.
-	 * @return boolean containing the value from the specified name.
+	 * @return boolean containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined, or if the supplied <code>trueValue</code> is <code>null</code>.
 	 */
 	boolean readBoolean(String name, String trueValue);
@@ -142,7 +142,7 @@ public interface FieldSet {
 	 * Read the '<code>char</code>' value at index '<code>index</code>'.
 	 * 
 	 * @param index the field index.
-	 * @return char containing the value from the specified index.
+	 * @return char containing the value from the specified {@code index}.
 	 *
 	 * @throws IndexOutOfBoundsException if the index is out of bounds.
 	 */
@@ -151,10 +151,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>char</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return char containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return char containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	char readChar(String name);
@@ -163,7 +163,7 @@ public interface FieldSet {
 	 * Read the '<code>byte</code>' value at index '<code>index</code>'.
 	 * 
 	 * @param index the field index.
-	 * @return byte containing the value from the specified index.
+	 * @return byte containing the value from the specified {@code index}.
 	 *
 	 * @throws IndexOutOfBoundsException if the index is out of bounds.
 	 */
@@ -172,15 +172,15 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>byte</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.*
-	 * @return byte containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return byte containing the value from the specified {@code name}.
 	 */
 	byte readByte(String name);
 
 	/**
 	 * Read the '<code>short</code>' value at index '<code>index</code>'.
 	 * 
-	 * @param index the field index.
+	 * @param index the field {@code index}.
 	 * @return short containing the value from the specified index.
 	 *
 	 * @throws IndexOutOfBoundsException if the index is out of bounds.
@@ -190,10 +190,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>short</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return short containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return short containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	short readShort(String name);
@@ -211,10 +211,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>int</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return int containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return int containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	int readInt(String name);
@@ -237,11 +237,11 @@ public interface FieldSet {
 	 * using the supplied <code>defaultValue</code> if the field value is
 	 * blank.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param defaultValue the value to use if the field value is blank.
-	 * @return int containing the value from the specified name.
+	 * @return int containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	int readInt(String name, int defaultValue);
@@ -259,10 +259,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>long</code>' value from column with given '<code>name</code>'.
 	 * 
-	 * @param name the field name.
-	 * @return long containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return long containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	long readLong(String name);
@@ -285,11 +285,11 @@ public interface FieldSet {
 	 * using the supplied <code>defaultValue</code> if the field value is
 	 * blank.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param defaultValue the value to use if the field value is blank.
-	 * @return long containing the value from the specified name.
+	 * @return long containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	long readLong(String name, long defaultValue);
@@ -307,10 +307,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>float</code>' value from column with given '<code>name</code>.
 	 * 
-	 * @param name the field name.
-	 * @return float containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return float containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	float readFloat(String name);
@@ -328,10 +328,10 @@ public interface FieldSet {
 	/**
 	 * Read the '<code>double</code>' value from column with given '<code>name</code>.
 	 * 
-	 * @param name the field name.
-	 * @return double containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return double containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	double readDouble(String name);
@@ -349,10 +349,10 @@ public interface FieldSet {
 	/**
 	 * Read the {@link java.math.BigDecimal} value from column with given '<code>name</code>.
 	 * 
-	 * @param name the field name.
-	 * @return {@link BigDecimal} containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return {@link BigDecimal} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	BigDecimal readBigDecimal(String name);
@@ -375,11 +375,11 @@ public interface FieldSet {
 	 * returning the supplied <code>defaultValue</code> if the trimmed string
 	 * value at index '<code>index</code>' is blank.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param defaultValue the default value to use if the field is blank
-	 * @return {@link BigDecimal} containing the value from the specified name.
+	 * @return {@link BigDecimal} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	BigDecimal readBigDecimal(String name, BigDecimal defaultValue);
@@ -401,10 +401,10 @@ public interface FieldSet {
 	 * Read the <code>java.sql.Date</code> value in given format from column
 	 * with given <code>name</code>.
 	 * 
-	 * @param name the field name.
-	 * @return {@link Date} containing the value from the specified name.
+	 * @param name the field {@code name}.
+	 * @return {@link Date} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined or if the value is not parseable
 	 * @throws NullPointerException if the value is empty
 	 */
@@ -428,11 +428,11 @@ public interface FieldSet {
 	 * Read the <code>java.sql.Date</code> value in given format from column
 	 * with given <code>name</code>.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param defaultValue the default value to use if the field is blank
-	 * @return {@link Date} containing the value from the specified name.
+	 * @return {@link Date} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined.
 	 */
 	Date readDate(String name, Date defaultValue);
@@ -455,11 +455,11 @@ public interface FieldSet {
 	 * Read the <code>java.sql.Date</code> value in given format from column
 	 * with given <code>name</code>.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param pattern the pattern describing the date and time format
-	 * @return {@link Date} containing the value from the specified name.
+	 * @return {@link Date} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined or if the specified field cannot be parsed
 	 * 
 	 */
@@ -484,12 +484,12 @@ public interface FieldSet {
 	 * Read the <code>java.sql.Date</code> value in given format from column
 	 * with given <code>name</code>.
 	 * 
-	 * @param name the field name.
+	 * @param name the field {@code name}.
 	 * @param pattern the pattern describing the date and time format
 	 * @param defaultValue the default value to use if the field is blank
-	 * @return {@link Date} containing the value from the specified name.
+	 * @return {@link Date} containing the value from the specified {@code name}.
 	 *
-	 * @throws IllegalArgumentException if a column with given name is not
+	 * @throws IllegalArgumentException if a column with given {@code name} is not
 	 * defined or if the specified field cannot be parsed
 	 * 
 	 */

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

@@ -34,7 +34,7 @@ public class CompositeItemStream implements ItemStream {
 	private List<ItemStream> streams = new ArrayList<ItemStream>();
 
 	/**
-	 * Public setter for the streams.
+	 * Public setter for the {@link ItemStream}s.
 	 * 
 	 * @param streams array of {@link ItemStream}.
 	 */

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/util/FileUtils.java

@@ -43,11 +43,6 @@ public final class FileUtils {
 	 * @param append true signals input file may already exist (but doesn't have to)
 	 * @param overwriteOutputFile If set to true, output file will be overwritten (this flag is ignored when processing
 	 * is restart)
-	 * 
-	 * @throws IllegalArgumentException when file is null
-	 * @throws ItemStreamException when starting output file processing, file exists and flag "overwriteOutputFile" is
-	 * set to false
-	 * @throws ItemStreamException when unable to create file or file is not writable
 	 */
 	public static void setUpOutputFile(File file, boolean restarted, boolean append, boolean overwriteOutputFile) {
 

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/validator/ValidatingItemProcessor.java

@@ -62,8 +62,9 @@ public class ValidatingItemProcessor<T> implements ItemProcessor<T, T>, Initiali
 	/**
 	 * Should the processor filter invalid records instead of skipping them?
 	 * 
-	 * @param filter true if filter is to return null or false if filter is to
-	 * throw a {@link ValidationException}.
+	 * @param filter if set to {@code true}, items that fail validation are filtered
+	 * ({@code null} is returned).  Otherwise, a {@link ValidationException} will be
+	 * thrown.
 	 */
 	public void setFilter(boolean filter) {
 		this.filter = filter;

spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/policy/CompositeCompletionPolicy.java

@@ -40,7 +40,7 @@ public class CompositeCompletionPolicy implements CompletionPolicy {
 	 * Setter for the policies.
 	 * 
 	 * @param policies an array of completion policies to be used to determine
-	 *  isComplete by consensus.
+	 *  {@link #isComplete(RepeatContext)}  by consensus.
 	 */
 	public void setPolicies(CompletionPolicy[] policies) {
 		this.policies = Arrays.asList(policies).toArray(new CompletionPolicy[policies.length]);

spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/policy/TimeoutTerminationPolicy.java

@@ -52,7 +52,7 @@ public class TimeoutTerminationPolicy extends CompletionPolicySupport {
 	 * Construct a {@link TimeoutTerminationPolicy} with the specified timeout
 	 * value (in milliseconds).
 	 * 
-	 * @param timeout the milliseconds to be used for the timeout.
+	 * @param timeout durration of the timeout.
 	 */
 	public TimeoutTerminationPolicy(long timeout) {
 		super();

spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/support/RepeatTemplate.java

@@ -467,7 +467,7 @@ public class RepeatTemplate implements RepeatOperations {
 	/**
 	 * Delegate to the {@link CompletionPolicy}.
 	 *
-	 * @return a RepeatContext object that can be used by the implementation to store
+	 * @return a {@link RepeatContext} object that can be used by the implementation to store
 	 * internal state for a batch step.
 	 * 
 	 * @see org.springframework.batch.repeat.CompletionPolicy#start(RepeatContext)

spring-batch-infrastructure/src/main/java/org/springframework/batch/support/AnnotationMethodResolver.java

@@ -29,7 +29,7 @@ import org.springframework.util.ObjectUtils;
 import org.springframework.util.ReflectionUtils;
 
 /**
- * MethodResolver implementation that finds a <em>single</em> Method on the
+ * {@link MethodResolver} implementation that finds a <em>single</em> Method on the
  * given Class that contains the specified annotation type.
  * 
  * @author Mark Fisher
@@ -40,7 +40,7 @@ public class AnnotationMethodResolver implements MethodResolver {
 
 
 	/**
-	 * Create a MethodResolver for the specified Method-level annotation type.
+	 * Create a {@link MethodResolver} for the specified Method-level annotation type.
 	 *
 	 * @param annotationType establish the annotation to be used.
 	 */

spring-batch-infrastructure/src/main/java/org/springframework/batch/support/MethodInvokerUtils.java

@@ -185,7 +185,7 @@ public class MethodInvokerUtils {
 	 * @param target an object to search for an appropriate method.
 	 * @param <C> the class.
 	 * @param <T> the type.
-	 * @return a MethodInvoker that calls a method on the delegate.
+	 * @return a {@link MethodInvoker} that calls a method on the delegate.
 	 */
 	public static <C, T> MethodInvoker getMethodInvokerForSingleArgument(Object target) {
 		final AtomicReference<Method> methodHolder = new AtomicReference<>();