Merge pull request #13184 from edizor/master

Update README

core-java-modules/core-java-collections-4/README.md

@@ -15,3 +15,4 @@
 - [Guide to Java PriorityQueue](https://www.baeldung.com/java-priorityqueue)
 - [Java Generics PECS – Producer Extends Consumer Super](https://www.baeldung.com/java-generics-pecs)
 - [Reversing a Stack in Java](https://www.baeldung.com/java-reversing-a-stack)
+- [Sorting a HashSet in Java](https://www.baeldung.com/java-sort-hashset)

core-java-modules/core-java-concurrency-collections-2/README.md

@@ -3,4 +3,5 @@
 - [Introduction to Lock Striping](https://www.baeldung.com/java-lock-stripping)
 - [Guide to the Java TransferQueue](http://www.baeldung.com/java-transfer-queue)
 - [Java Concurrent HashSet Equivalent to ConcurrentHashMap](https://www.baeldung.com/java-concurrent-hashset-concurrenthashmap)
+- [Reading and Writing With a ConcurrentHashMap](https://www.baeldung.com/concurrenthashmap-reading-and-writing)
 - [[<-- Prev]](/core-java-modules/core-java-concurrency-collections)

core-java-modules/core-java-lambdas/README.md

@@ -9,3 +9,4 @@
 - [The Double Colon Operator in Java 8](https://www.baeldung.com/java-8-double-colon-operator)
 - [Serialize a Lambda in Java](https://www.baeldung.com/java-serialize-lambda)
 - [Convert Anonymous Class into Lambda in Java](https://www.baeldung.com/java-from-anonymous-class-to-lambda)
+- [When to Use Callable and Supplier in Java](https://www.baeldung.com/java-callable-vs-supplier)

core-java-modules/core-java-lang-5/README.md

@@ -11,3 +11,4 @@ This module contains articles about core features in the Java language
 - [Variable Instantiation on Declaration vs. on Constructor in Java](https://www.baeldung.com/java-variable-instantiation-declaration-vs-constructor)
 - [Infinity in Java](https://www.baeldung.com/java-infinity)
 - [Type Parameter vs Wildcard in Java Generics](https://www.baeldung.com/java-generics-type-parameter-vs-wildcard)
+- [Convert Between int and char in Java](https://www.baeldung.com/java-convert-int-char)

core-java-modules/core-java-string-operations-5/README.md

@@ -7,3 +7,4 @@
 - [Convert String to char in Java](https://www.baeldung.com/java-convert-string-to-char)
 - [Convert String to String Array](https://www.baeldung.com/java-convert-string-to-string-array)
 - [String Interpolation in Java](https://www.baeldung.com/java-string-interpolation)
+- [Guide to Splitting a String by Whitespace in Java](https://www.baeldung.com/java-splitting-a-string-by-whitespace)

json-modules/json-2/README.md

@@ -10,6 +10,7 @@ This module contains articles about JSON.
 - [Generate a Java Class From JSON](https://www.baeldung.com/java-generate-class-from-json)
 - [A Guide to FastJson](https://www.baeldung.com/fastjson)
 - [Check Whether a String is Valid JSON in Java](https://www.baeldung.com/java-validate-json-string)
+- [Getting a Value in JSONObject](https://www.baeldung.com/java-jsonobject-get-value)
 
 - More Articles: [[<-- prev]](/json-modules/json)
 

security-modules/jwt/README.md

@@ -1,3 +1,4 @@
 ## Relevant Articles
 
 - [Managing JWT With Auth0 java-jwt](https://www.baeldung.com/java-auth0-jwt)
+- [Check JWT Expiry Without Throwing Exceptions](https://www.baeldung.com/java-jwt-check-expiry-no-exception)

spring-boot-modules/spring-boot-artifacts-2/README.md

@@ -6,4 +6,5 @@ This module contains articles about configuring the Spring Boot build process 2.
 
 - [Difference Between spring-boot:repackage and Maven package](https://www.baeldung.com/spring-boot-repackage-vs-mvn-package)
 - [Intro to Spring Boot Starters](https://www.baeldung.com/spring-boot-starters)
+- [Fixing the No Main Manifest Attribute in Spring Boot](https://www.baeldung.com/spring-boot-fix-the-no-main-manifest-attribute)
 - More articles: [[<-- prev]](/spring-boot-modules/spring-boot-artifacts)

spring-reactive-modules/spring-5-reactive-client-2/README.md

@@ -7,4 +7,5 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 ### Relevant Articles
 - [Limiting the Requests per Second With WebClient](https://www.baeldung.com/spring-webclient-limit-requests-per-second)
+- [Stream Large Byte[] to File With WebClient](https://www.baeldung.com/webclient-stream-large-byte-array-to-file)
 - More articles: [[<-- prev]](../spring-5-reactive-client)

testing-modules/assertion-libraries/README.md

@@ -10,3 +10,4 @@
 - [Custom Assertions with AssertJ](http://www.baeldung.com/assertj-custom-assertion)
 - [Using Conditions with AssertJ Assertions](http://www.baeldung.com/assertj-conditions)
 - [AssertJ Exception Assertions](http://www.baeldung.com/assertj-exception-assertion)
+- [Extract Values using AssertJ in Java](https://www.baeldung.com/java-extract-values-assertj)