This article explains how Spring Cloud Gateway (Hoxton.SR11) creates and configures predicate factories, binds their Config objects, builds Route objects, caches them with CachingRouteLocator, and finally matches incoming requests to the appropriate route using asynchronous predicates.
This article explains how to use Spring Data Querydsl to parse and execute flexible, type‑safe dynamic queries, covering request definition, Google‑like and field‑specific query formats, integration with Spring repositories, predicate building, boolean expression handling, and challenges when querying nested collections.
This article explains how to parse user‑defined query strings and convert them into type‑safe Spring Data Querydsl predicates, covering query patterns, code examples, dynamic query building, and handling complex parent‑child relationships in backend services.
This article presents several techniques for removing duplicate elements from Java lists, including Stream.distinct(), property‑based deduplication with TreeSet and Comparator, and custom filter predicates, providing code examples for both simple strings and custom entity objects.
This article explains the need for Java lambda expressions by illustrating the "Vertical Problem" of repetitive, tightly‑coupled code for different contact methods and demonstrates a progression of refactorings that culminate in a concise solution using functional interfaces and predicates.
