Merge pull request #7730 from sjmillington/core-java-move-1

[BAEL-13505] Move articles out of core-java part 1

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

@@ -1,3 +1,8 @@
 ## Relevant Articles:
 
 - [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch)
+- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
+- [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
+- [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
+- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
+- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)

core-java-modules/core-java-exceptions/pom.xml

@@ -26,10 +26,30 @@
 			<artifactId>commons-lang3</artifactId>
 			<version>${commons-lang3.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.openjdk.jmh</groupId>
+			<artifactId>jmh-core</artifactId>
+			<version>${jmh-core.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.openjdk.jmh</groupId>
+			<artifactId>jmh-generator-annprocess</artifactId>
+			<version>${jmh-generator-annprocess.version}</version>
+		</dependency>
+		<!-- test scoped -->
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>${assertj-core.version}</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 	<properties>
 		<commons-lang3.version>3.9</commons-lang3.version>
+		<jmh-core.version>1.19</jmh-core.version>
+		<assertj-core.version>3.10.0</assertj-core.version>
+		<jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
 	</properties>
 
 </project>

core-java-modules/core-java-networking-2/README.md

@@ -1,5 +1,7 @@
 ### Relevant Articles
 
 - [Checking if a URL Exists in Java](https://www.baeldung.com/java-check-url-exists)
+- [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)
+- [Using Curl in Java](https://www.baeldung.com/java-curl)
 - [Do a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
 - [Sending Emails with Java](http://www.baeldung.com/java-email)

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/urlconnection/PostJSONWithHttpURLConnection.java

@@ -0,0 +1,46 @@
+package com.baeldung.urlconnection;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class PostJSONWithHttpURLConnection {
+	
+	public static void main (String []args) throws IOException{
+		//Change the URL with any other publicly accessible POST resource, which accepts JSON request body
+		URL url = new URL ("https://reqres.in/api/users");
+		
+		HttpURLConnection con = (HttpURLConnection)url.openConnection();
+		con.setRequestMethod("POST");
+		
+		con.setRequestProperty("Content-Type", "application/json; utf-8");
+		con.setRequestProperty("Accept", "application/json");
+		
+		con.setDoOutput(true);
+		
+		//JSON String need to be constructed for the specific resource. 
+		//We may construct complex JSON using any third-party JSON libraries such as jackson or org.json
+		String jsonInputString = "{\"name\": \"Upendra\", \"job\": \"Programmer\"}";
+		
+		try(OutputStream os = con.getOutputStream()){
+			byte[] input = jsonInputString.getBytes("utf-8");
+			os.write(input, 0, input.length);			
+		}
+
+		int code = con.getResponseCode();
+		System.out.println(code);
+		
+		try(BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"))){
+			StringBuilder response = new StringBuilder();
+			String responseLine = null;
+			while ((responseLine = br.readLine()) != null) {
+				response.append(responseLine.trim());
+			}
+			System.out.println(response.toString());
+		}
+	}
+
+}

core-java-modules/core-java-reflection/README.MD

@@ -1,6 +1,7 @@
 ## Relevant Articles
 
 - [Void Type in Java](https://www.baeldung.com/java-void-type)
+- [Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields)
 - [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
 - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
 - [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)