Maven JAR plugin skipping generated-resources folder - angularjs

Question

I am facing a strange issue while trying to run a simple AngularJS Spring Boot project (after sorting out the issues mentioned in this thread). Following is my Maven POM. The issue I am facing is that while the Wro4j plugin is able to generate the JS/CSS files under generated-resources, and despite that under build/resources I have provided the paths to be packaged, the files under generated-resources are not getting packaged within the JAR under "static" folder (only my custom JS file and the index.html file appear there). How could this be corrected?
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-angularjs</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.test</groupId>
<artifactId>my-microservice-parent</artifactId>
<version>0.1.0-SNAPSHOT</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<wro4j.version>1.8.0</wro4j.version>
<java.version>1.8</java.version>
<bootstrap.version>3.3.7-1</bootstrap.version>
<angularjs.version>1.5.9</angularjs.version>
<jquery.version>3.1.1-1</jquery.version>
</properties>
<dependencies>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>angularjs</artifactId>
<version>${angularjs.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jasmine</artifactId>
<version>2.0.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>${project.build.directory}/generated-resources</directory>
</resource>
<resource>
<directory>${project.basedir}/src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<executions>
<execution>
<!-- Serves *only* to filter the wro.xml so it can get an absolute
path for the project -->
<id>copy-resources</id>
<phase>validate</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/wro</outputDirectory>
<resources>
<resource>
<directory>src/main/wro</directory>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>ro.isdc.wro4j</groupId>
<artifactId>wro4j-maven-plugin</artifactId>
<version>${wro4j.version}</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
<configuration>
<wroManagerFactory>ro.isdc.wro.maven.plugin.manager.factory.ConfigurableWroManagerFactory</wroManagerFactory>
<cssDestinationFolder>${project.build.directory}/generated-resources/static/css</cssDestinationFolder>
<jsDestinationFolder>${project.build.directory}/generated-resources/static/js</jsDestinationFolder>
<wroFile>${project.build.directory}/wro/wro.xml</wroFile>
<!--
<extraConfigFile>${basedir}/src/main/wro/wro.properties</extraConfigFile>
<contextFolder>${basedir}/src/main/wro</contextFolder>
-->
<extraConfigFile>${project.build.directory}/wro/wro.properties</extraConfigFile>
<contextFolder>${project.build.directory}/wro</contextFolder>
</configuration>
<dependencies>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>${jquery.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>angularjs</artifactId>
<version>${angularjs.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>${bootstrap.version}</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>com.github.searls</groupId>
<artifactId>jasmine-maven-plugin</artifactId>
<version>2.0</version>
<executions>
<execution>
<goals>
<goal>test</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>angularjs</artifactId>
<version>${angularjs.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
Following is the Maven build log (for mvn clean package):
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building spring-angularjs 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) # spring-angularjs ---
[INFO] Deleting C:\projects\spring-angularjs\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:copy-resources (copy-resources) # spring-angularjs ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # spring-angularjs ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\projects\spring-angularjs\target\generated-resources
[INFO] Copying 3 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) # spring-angularjs ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to C:\projects\spring-angularjs\target\classes
[INFO]
[INFO] --- wro4j-maven-plugin:1.8.0:run (default) # spring-angularjs ---
[INFO] C:\projects\spring-angularjs\target/wro
[INFO] Executing the mojo:
[INFO] Wro4j Model path: C:\projects\spring-angularjs\target\wro\wro.xml
[INFO] targetGroups: null
[INFO] minimize: true
[INFO] ignoreMissingResources: null
[INFO] parallelProcessing: false
[INFO] buildDirectory: C:\projects\spring-angularjs\target
[INFO] destinationFolder: C:\projects\spring-angularjs\target
[INFO] jsDestinationFolder: C:\projects\spring-angularjs\target\generated-resources\static\js
[INFO] cssDestinationFolder: C:\projects\spring-angularjs\target\generated-resources\static\css
[INFO] The following groups will be processed: [angular-bootstrap]
[INFO] folder: C:\projects\spring-angularjs\target\generated-resources\static\css
[INFO] processing group: angular-bootstrap.css
[WARNING] Less warnings are:
[WARNING] 10:1 Cannot link source map. Css result location is not know and could not be deduced from input less source..
[INFO] file size: angular-bootstrap.css -> 145074 bytes
[INFO] C:\projects\spring-angularjs\target\generated-resources\static\css\angular-bootstrap.css (145074 bytes)
[INFO] folder: C:\projects\spring-angularjs\target\generated-resources\static\js
[INFO] processing group: angular-bootstrap.js
[INFO] file size: angular-bootstrap.js -> 254638 bytes
[INFO] C:\projects\spring-angularjs\target\generated-resources\static\js\angular-bootstrap.js (254638 bytes)
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) # spring-angularjs ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\projects\spring-angularjs\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) # spring-angularjs ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.18.1:test (default-test) # spring-angularjs ---
[INFO] No tests to run.
[INFO]
[INFO] --- jasmine-maven-plugin:2.0:test (default) # spring-angularjs ---
[INFO] jetty-8.1.14.v20131031
[INFO] Started SelectChannelConnector#0.0.0.0:60402
[INFO] Executing Jasmine Specs
[INFO] Resolved artifact C:\Users\XXXXX\.m2\repository\com\github\klieber\phantomjs\2.0.0\phantomjs-2.0.0-windows.zip from remote-repos-vr (https://vrartifactory.eficode.com/remote-repos-vr, default, releases+snapshots)
[INFO] Extracting C:\Users\XXXXX\.m2\repository\com\github\klieber\phantomjs\2.0.0\phantomjs-2.0.0-windows.zip\phantomjs-2.0.0-windows\bin\phantomjs.exe to C:\projects\spring-angularjs\target\phantomjs\phantomjs-2.0.0-windows\bin\phantomjs.exe
[INFO]
-------------------------------------------------------
J A S M I N E S P E C S
-------------------------------------------------------
[INFO]
Results: 0 specs, 0 failures, 0 pending
[INFO] stopped o.e.j.s.h.ContextHandler{/webjars,file:/C:/projects/spring-angularjs/}
[INFO] stopped o.e.j.s.h.ContextHandler{/classpath,file:/C:/projects/spring-angularjs/}
[INFO] stopped o.e.j.s.h.ContextHandler{/,file:/C:/projects/spring-angularjs/}
[INFO] stopped o.e.j.s.h.ContextHandler{/spec,file:/C:/projects/spring-angularjs/}
[INFO] stopped o.e.j.s.h.ContextHandler{/src,file:/C:/projects/spring-angularjs/}
[INFO]
[INFO] --- maven-jar-plugin:2.5:jar (default-jar) # spring-angularjs ---
[INFO] Building jar: C:\projects\spring-angularjs\target\spring-angularjs-0.0.1-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:1.3.8.RELEASE:repackage (default) # spring-angularjs ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 32.848 s
[INFO] Finished at: 2017-11-09T16:04:39+05:30
[INFO] Final Memory: 98M/503M
[INFO] ------------------------------------------------------------------------

Answer 1

wro4j-maven-plugin:run is running at compile phase, after the process-resources phases where all resources are copied to ${project.build.outputDirectory} (by default target/classes). Only files from this folder are included into your JAR, but your CSS/JS files are generated after Maven tried to copy them to the outputDirectory, thus never being added.
You simply have to configure Wro4j plugin to run during generate-resources phase:
<plugin>
<groupId>ro.isdc.wro4j</groupId>
<artifactId>wro4j-maven-plugin</artifactId>
<version>${wro4j.version}</version>
<executions>
<execution>
<phase>generate-resources</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
...
</plugin>
If for some reasons your files cannot be generated before compile (maybe it requires your code to be compiled), you'll have instead to manually add your resources into your project build output directory with the Maven Resources Plugin after they are generated as you did in your comment - though I would recommend doing it during the prepare-package phase using ${project.build.outputDirectory} such as:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
<execution>
<id>copy-resources-post-compile</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${project.build.outputDirectory}</outputDir‌​ector‌​y>
<resources>
<resource>
<directory>${project.build.directory}/generated-res‌​ources</directory>
</resource>
</resources>
</configuration>
</execution>
</plugin>
EDIT: To learn more about the Maven lifecycle, phases and goals, see Intro to Build Lifecycle and this tutorial explains things well. Also take a look at the default bindings to see which plugins are run by default depending on your packaging.