Added yarn to frontend build process

Author: Rachit Bhasin

.gitignore

@@ -37,7 +37,7 @@ src/main/webapp/react-app/coverage*
 src/main/webapp/react-app/npm-debug.log
 
 // Javascript bundle
-src/main/webapp/js*
+src/main/webapp/static/js/*
 
 // CSS bundle
-src/main/webapp/css*
+src/main/webapp/static/css/*

pom.xml

@@ -131,42 +131,40 @@
 
 				<executions>
 					<execution>
-						<id>install node and npm</id>
+						<id>install node and yarn</id>
 						<goals>
-							<goal>install-node-and-npm</goal>
+							<goal>install-node-and-yarn</goal>
 						</goals>
 						<configuration>
 							<nodeVersion>v8.9.4</nodeVersion>
-							<npmVersion>5.6.0</npmVersion>
+							<yarnVersion>v1.3.2</yarnVersion>
 						</configuration>
 					</execution>
-					<!-- Uncomment this section if building project for the first time or 
-						the package.json has been updated -->
-					<!-- <execution> -->
-					<!-- <id>npm install</id> -->
-					<!-- <goals> -->
-					<!-- <goal>npm</goal> -->
-					<!-- </goals> -->
-					<!-- Optional configuration which provides for running any npm command -->
-					<!-- <configuration> -->
-					<!-- <arguments>install</arguments> -->
-					<!-- </configuration> -->
-					<!-- </execution> -->
 
 					<execution>
-						<id>npm run clean</id>
+                        <id>yarn install</id>
+                        <goals>
+                            <goal>yarn</goal>
+                        </goals>
+                        <configuration>
+                            <arguments>install</arguments>
+                        </configuration>
+                    </execution>
+					
+					<execution>
+						<id>yarn run clean</id>
 						<goals>
-							<goal>npm</goal>
+							<goal>yarn</goal>
 						</goals>
 						<configuration>
 							<arguments>run clean</arguments>
 						</configuration>
 					</execution>
 
 					<execution>
-						<id>npm run start</id>
+						<id>yarn run start</id>
 						<goals>
-							<goal>npm</goal>
+							<goal>yarn</goal>
 						</goals>
 						<configuration>
 							<arguments>run start</arguments>

src/main/java/com/rc/uam/servlet/HelloWorldServlet.java

@@ -7,7 +7,7 @@
     "start": "cross-env NODE_ENV=development BABEL_ENV=development webpack --env=development  --progress",
     "prod": "npm run clean && npm run build-prod",
     "build-prod": "cross-env NODE_ENV=production BABEL_ENV=production webpack --env=production -p --progress",
-    "clean": "cd ../static && rd /s /q js css",
+    "clean": "cd ../static && del /S /Q js\\* css\\*",
     "test:clean": "rd /s /q coverage",
     "test": "jest",
     "test:coverage": "jest --coverage",
@@ -38,11 +38,9 @@
     "sass-loader": "^6.0.6",
     "style-loader": "^0.19.0",
     "url-loader": "^0.6.2",
-    "webpack": "^3.10.0",
-    "webpack-dev-server": "^2.10.0"
+    "webpack": "^3.10.0"
   },
   "dependencies": {
-    "babel-preset-react-hmre": "^1.1.1",
     "prop-types": "^15.6.0",
     "react": "^16.2.0",
     "react-dom": "^16.2.0",