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aList.stream()
        .collect(Collectors.groupingBy(AnObject::getKeyField, toDescSortedList()))
        .values()
        .stream()
        .map(list -> list.get(0))
        .collect(Collectors.toMap(AnObject::getKeyField, AnObject::getValueField));

private static <AnObject> Collector<AnObject,?,List<AnObject>> toDescSortedList() {
    return Collectors.collectingAndThen(
            Collectors.toCollection(ArrayList::new), list -> {

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// source: http://stackoverflow.com/a/2641047/1201725
//
// [name] is the name of the event "click", "mouseover", .. 
// same as you'd pass it to bind()
// [fn] is the handler function
$.fn.bindFirst = function(name, fn) {
    // bind as you normally would
    // don't want to miss out on any jQuery magic
    this.on(name, fn);
  

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/**
 * Convert list to string with delimiter
 * @param <T> class of the collection
 * @param values Given long values
 * @param classTypeParam Pass class type to get fields, do not set null
 * @param fieldName Name of the field of the object to get value of
 * @param delimiter Given delimiter
 * @return ({1L,3L,5L} + Long.class + null + ",") --> ("1,3,5")
 *         ({{id:1},{id:2},{id:3}} + ObjectClass.class + "id" + ",") --> ("1,2,3")
 */

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/*
 * By the design pattern below, you can easily run any code blocks on a Service in Spring MVC.
 * This provides a easy usage way of threads, high code maintainability and readability.
 */

public class SpringServiceThread {
  
  @Service
  public class ThreadService {
      

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SELECT 
    t.field1,
    t.field2,
    contains.id is not null contains_record
FROM
    table t
        LEFT JOIN
    (select tom.* from table_one_to_many_relation tom where tom.id = 1) contains on contains.table_id = t.id

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       /** Design pattern below provides setting nullable values to the prepared statement easily
	 * Set nullable value to PreparedStatement
	 * @param ps PreparedStatement object
	 * @param value Value to set
	 * @param type Type of the value at DBMS (ex: Types.VARCHAR)
	 * @param index Index of the value inside query string
	 * @return Given PreparedStatement object with the value set
	 * @throws SQLException
	 * @throws TypeConstraintException If the type of the given value not found
	 */