build: process JavaScript components with Babel.

As "frontend" plugin gets activated before executing any goals, this
leads to a non obvious outcome that "mvn clean <some goal>" command
doesn't regenerate JS-files. It happens because "frontent" plugin
doesn't get activated as the target/classes/js/components directory
exists in the begginning and hasn't been removed yet.

As a workaround you might use:
- mvn -Pfrontend clean <some goal>
- mvn clean; mvn <some goal>

Addressed to #1060 and (a little bit to) #1057

Dangerfile

@@ -405,6 +405,8 @@ if File.file?(validator_output)
 	print_errors_summary 'html5validator', errors_count
 end
 
+# @todo #1060 Danger: handle Babel errors from frontend-maven-plugin
+
 # Handle `mvn org.apache.maven.plugins:maven-compiler-plugin:compile` output
 # Handle `mvn org.apache.maven.plugins:maven-compiler-plugin:testCompile` output
 # Handle `mvn org.codehaus.gmavenplus:gmavenplus-plugin:testCompile` output
@@ -696,8 +698,9 @@ if github.branch_for_head !~ /^gh[0-9]+_/
 end
 
 js_file  = %r{^src/main/javascript/.*\.js$}
+component_file  = %r{^src/main/frontend/src/.*\.js$}
 css_file = %r{^src/main/webapp/.*\.css$}
-modified_resources = git.modified_files.any? { |file| file =~ js_file || file =~ css_file }
+modified_resources = git.modified_files.any? { |file| file =~ js_file || file =~ component_file || file =~ css_file }
 updated_url = git.modified_files.include? 'src/main/java/ru/mystamps/web/feature/site/ResourceUrl.java'
 if modified_resources && !updated_url
 	warn("danger check: looks like you forgot to update `ResourceUrl.RESOURCES_VERSION` after modifying JS/CSS file(s)")

README.md

@@ -36,7 +36,7 @@ If you are programmer/sysadmin or you just feeling that you are able to run a lo
 
 * *At the heart of*: Spring Framework (and especially Spring Boot)
 * *Template engine*: Thymeleaf
-* *UI*: HTML, Bootstrap and a bit of JavaScript with JQuery
+* *UI*: HTML, Bootstrap and JavaScript (React, JQuery)
 * *Security*: Spring Security
 * *Databases*: H2, MySQL or PostgreSQL
 * *Database access*: Spring's `JdbcTemplate`

pom.xml

@@ -1223,8 +1223,15 @@
 		</profile>
 		<profile>
 			<id>frontend</id>
+			<activation>
+				<file>
+					<!-- Should be in sync with Babel configuration from src/main/frontend/package.json -->
+					<missing>target/classes/js/components</missing>
+				</file>
+			</activation>
 			<build>
 				<plugins>
+					<!-- @todo #1060 Document usage of frontend-maven-plugin -->
 					<!--
 						We assume that most of the time we develop backend rather frontend.
 						So, we cache and skip the frontend-related things by default. This
@@ -1257,6 +1264,16 @@
 									<arguments>ci</arguments>
 								</configuration>
 							</execution>
+							<execution>
+								<id>npm-run-build</id>
+								<goals>
+									<goal>npm</goal>
+								</goals>
+								<phase>generate-resources</phase>
+								<configuration>
+									<arguments>run build</arguments>
+								</configuration>
+							</execution>
 						</executions>
 					</plugin>
 				</plugins>

src/main/frontend/package.json

@@ -10,7 +10,8 @@
     "babel-preset-react": "^6.24.1"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "babel src --out-dir ../../../target/classes/js",
+    "watch": "babel src --out-dir ../../../target/classes/js --watch"
   },
   "repository": {
     "type": "git",

src/main/frontend/src/components/SeriesSaleImportForm.js

@@ -0,0 +1,5 @@
+//
+// IMPORTANT:
+// You must update ResourceUrl.RESOURCES_VERSION each time whenever you're modified this file!
+//
+

src/main/scripts/ci/check-build-and-verify.sh

@@ -200,7 +200,7 @@ if [ "$RUN_ONLY_INTEGRATION_TESTS" = 'no' ]; then
 	print_status "$ENFORCER_STATUS" 'Run maven-enforcer-plugin'
 
 	if [ "$TEST_STATUS" != 'skip' ]; then
-		mvn --batch-mode test -Denforcer.skip=true -Dmaven.resources.skip=true -DskipMinify=true -DdisableXmlReport=false \
+		mvn --batch-mode test -Denforcer.skip=true -Dmaven.resources.skip=true -DskipMinify=true -DdisableXmlReport=false -Dskip.npm -Dskip.installnodenpm \
 			>test.log 2>&1 || TEST_STATUS=fail
 	fi
 	print_status "$TEST_STATUS" 'Run unit tests'
@@ -220,7 +220,7 @@ if [ "$RUN_ONLY_INTEGRATION_TESTS" = 'no' ]; then
 	print_status "$SPOTBUGS_STATUS" 'Run SpotBugs'
 fi
 
-mvn --batch-mode verify -Denforcer.skip=true -DskipUnitTests=true \
+mvn --batch-mode --activate-profiles frontend verify -Denforcer.skip=true -DskipUnitTests=true \
 	>verify-raw.log 2>&1 || VERIFY_STATUS=fail
 # Workaround for #538
 "$(dirname "$0")/filter-out-htmlunit-messages.pl" <verify-raw.log >verify.log

src/main/scripts/ci/publish-code-coverage.sh

@@ -15,7 +15,7 @@ set -o pipefail
 
 JACOCO_FAIL=
 
-mvn --batch-mode jacoco:prepare-agent test jacoco:report -Denforcer.skip=true -DskipMinify=true >jacoco.log 2>&1 || JACOCO_FAIL=yes
+mvn --batch-mode jacoco:prepare-agent test jacoco:report -Denforcer.skip=true -DskipMinify=true -Dskip.npm -Dskip.installnodenpm >jacoco.log 2>&1 || JACOCO_FAIL=yes
 
 # -Z Exit with 1 if not successful. Default will Exit with 0
 bash <(curl -s https://codecov.io/bash) -Z >>jacoco.log 2>&1 || JACOCO_FAIL=yes