docs: Content SEO updates (#2990)

* update yaml frontmatter format

* update abstract document

* update abstract factory

* use the new pattern template

* acyclic visitor seo

* adapter seo

* ambassador seo

* acl seo

* aaa seo

* async method invocation seo

* balking seo

* bridge seo

* builder seo

* business delegate and bytecode seo

* caching seo

* callback seo

* chain seo

* update headings

* circuit breaker seo

* client session + collecting parameter seo

* collection pipeline seo

* combinator SEO

* command seo

* cqrs seo

* commander seo

* component seo

* composite seo

* composite entity seo

* composite view seo

* context object seo

* converter seo

* crtp seo

* currying seo

* dao seo

* data bus seo

* data locality seo

* data mapper seo

* dto seo

* decorator seo

* delegation seo

* di seo

* dirty flag seo

* domain model seo

* double buffer seo

* double checked locking seo

* double dispatch seo

* dynamic proxy seo

* event aggregator seo

* event-based asynchronous seo

* eda seo

* event queue seo

* event sourcing seo

* execute around seo

* extension objects seo

* facade seo

* factory seo

* factory kit seo

* factory method seo

* fanout/fanin seo

* feature toggle seo

* filterer seo

* fluent interface seo

* flux seo

* flyweight seo

* front controller seo

* function composition seo

* game loop seo

* gateway seo

* guarded suspension seo

* half-sync/half-async seo

* health check seo

* hexagonal seo

* identity map seo

* intercepting filter seo

* interpreter seo

* iterator seo

* layers seo

* lazy loading seo

* leader election seo

* leader/followers seo

* lockable object seo

* rename and add seo for marker interface

* master-worker seo

* mediator seo

* memento seo

* metadata mapping seo

* microservice aggregator seo

* api gw seo

* microservices log aggregration seo

* mvc seo

* mvi seo

* mvp seo

* mvvm seo

* monad seo

* monitor seo

* monostate seo

* multiton seo

* mute idiom seo

* naked objects & notification seo

* null object seo

* object mother seo

* object pool seo

* observer seo

* optimistic locking seo

* page controller seo

* page object seo

* parameter object seo

* partial response seo

* pipeline seo

* poison pill seo

* presentation model seo

* private class data seo

* producer-consumer seo

* promise seo

* property seo

* prototype seo

* proxy seo

* queue-based load leveling seo

* reactor seo

* registry seo

* repository seo

* RAII seo

* retry seo

* role object seo

* saga seo

* separated interface seo

* serialized entity seo

* serialized lob seo

* servant seo

* server session seo

* service layer seo

* service locator seo

* service to worker seo

* sharding seo

* single table inheritance seo

* singleton seo

* spatial partition seo

* special case seo

* specification seo

* state seo

* step builder seo

* strangler seo

* strategy seo

* subclass sandbox seo

* table module seo

* template method seo

* throttling seo

* tolerant reader seo

* trampoline seo

* transaction script seo

* twin seo

* type object seo

* unit of work seo

* update method seo

* value object seo

* version number seo

* virtual proxy seo

* visitor seo

* seo enhancements

* seo improvements

* SEO enhancements

* SEO improvements

* SEO additions

* SEO improvements

* more SEO improvements

* rename hexagonal + SEO improvements

* SEO improvements

* more SEO stuff

* SEO improvements

* SEO optimizations

* SEO enhancements

* enchance SEO

* improve SEO

* SEO improvements

* update headers

null-object/README.md

@@ -1,11 +1,13 @@
 ---
-title: Null Object
+title: "Null Object Pattern in Java: Streamlining Error Handling with Graceful Defaults"
+shortTitle: Null Object
+description: "Learn how the Null Object Pattern simplifies your Java code by handling null references effectively. Discover its implementation, advantages, and practical use cases."
 category: Behavioral
 language: en
 tag:
-    - Code simplification
-    - Decoupling
-    - Polymorphism
+  - Code simplification
+  - Decoupling
+  - Polymorphism
 ---
 
 ## Also known as
@@ -13,11 +15,11 @@ tag:
 * Active Nothing
 * Stub
 
-## Intent
+## Intent of Null Object Design Pattern
 
-To provide a default behavior for an object, avoiding the need for null checks and enhancing code readability.
+The Null Object Pattern is an essential Java design pattern that provides a seamless way to handle absent objects without performing null checks, streamlining your Java applications.
 
-## Explanation
+## Detailed Explanation of Null Object Pattern with Real-World Examples
 
 Real-world example
 
@@ -33,7 +35,9 @@ Wikipedia says
 
 > In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral ("null") behavior. The null object design pattern describes the uses of such objects and their behavior (or lack thereof).
 
-**Programmatic Example**
+## Programmatic Example of Null Object in Java
+
+By implementing the Null Object Pattern, Java developers can ensure that their applications handle 'empty' objects more gracefully, enhancing code stability and readability.
 
 We are building a binary tree from nodes. There are ordinary nodes and "empty" nodes. Traversing the tree normally should not cause errors, so we use null object pattern where necessary.
 
@@ -158,19 +162,19 @@ Program output:
 122
 ```
 
-## Applicability
+## When to Use the Null Object Pattern in Java
 
 * When you need to provide a default behavior in place of a null object.
 * To simplify the client code by eliminating null checks.
 * When a default action is preferable to handling a null reference.
 
-## Known Uses
+## Real-World Applications of Null Object Pattern in Java
 
-* Logging systems where a NullLogger can be used to avoid null checks.
+* Commonly used in logging systems, the Null object helps prevent NullPointerExceptions, making it a critical pattern for reliable Java software development.
 * Collections that use a NullIterator to handle empty collections gracefully.
 * GUI systems where a NullComponent can be used to represent a component that does nothing.
 
-## Consequences
+## Benefits and Trade-offs of Null Object Pattern
 
 Benefits:
 
@@ -183,13 +187,13 @@ Trade-offs:
 * May introduce additional classes, potentially increasing the overall complexity of the system.
 * The default behavior might mask potential issues that would otherwise be caught by explicit null handling.
 
-## Related Patterns
+## Related Java Design Patterns
 
 * [Strategy](https://java-design-patterns.com/patterns/strategy/): Null Object can be seen as a special case of the Strategy Pattern where the strategy is to do nothing.
 * [State](https://java-design-patterns.com/patterns/state/): Similar in that both patterns can handle different states or behaviors; Null Object is like a state that does nothing.
 * [Factory](https://java-design-patterns.com/patterns/factory/): Often used to provide Null Objects in place of actual objects.
 
-## Credits
+## References and Credits
 
 * [Design Patterns: Elements of Reusable Object-Oriented Software](https://amzn.to/3w0pvKI)
 * [Effective Java](https://amzn.to/4cGk2Jz)