Jhipster : issue with Grunt on blank project - gruntjs

Question

I am trying to package a Jhipster 2.1.1 application.
I know it's not supported anymore, but I am maintaining this webapp and we are not able to upgrade Jhipster version.
As the packaging with Grunt doesn't work I have just created a blank application (in order to test Grunt) and ran:
mvn -Pprod package -Dmaven.test.skip=true
I am getting :
[
ERROR] Failed to execute goal com.github.trecloux:yeoman-maven-plugin:0.2:build (run-grunt) on project jhipster: Error during : grunt test --no-color: Process exited with an error: 3 (Exit value: 3) -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.github.trecloux:yeoman-maven-plugin:0.2:build (run-grunt) on project jhipster: Error during : grunt test --no-color
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error during : grunt test --no-color
at com.github.trecloux.yeoman.YeomanMojo.executeCommand(YeomanMojo.java:104)
at com.github.trecloux.yeoman.YeomanMojo.logAndExecuteCommand(YeomanMojo.java:85)
at com.github.trecloux.yeoman.YeomanMojo.grunt(YeomanMojo.java:73)
at com.github.trecloux.yeoman.YeomanMojo.execute(YeomanMojo.java:56)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
... 26 more
Caused by: org.apache.commons.exec.ExecuteException: Process exited with an error: 3 (Exit value: 3)
at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
at com.github.trecloux.yeoman.YeomanMojo.executeCommand(YeomanMojo.java:102)
... 31 more
[UPDATE]
➜ grunt -V
grunt-cli v1.2.0
grunt v0.4.5
➜ bower -v
1.8.0
➜ node -v
v4.7.2
I found the pb, jasmine-core and requireJs were missing. Now packaging works fine. But when I deploy my war on Tomcat7, the image ('jhipster man') doesn't show. I am getting these errors in the browser :
Failed to load resource: the server responded with a status of 404 (Introuvable)
http://localhost:8181/jhipster/api/account?cacheBuster=1485698191924 Failed to load resource: the server responded with a status of 401 (Non-Autorisé)
http://localhost:8181/assets/images/5483e159.hipster.png Failed to load resource: the server responded with a status of 404 (Introuvable)
http://localhost:8181/bower_components/bootstrap/dist/fonts/glyphicons-halflings-regular.woff2 Failed to load resource: the server responded with a status of 404 (Introuvable)
http://localhost:8181/bower_components/bootstrap/dist/fonts/glyphicons-halflings-regular.woff Failed to load resource: the server responded with a status of 404 (Introuvable)
http://localhost:8181/bower_components/bootstrap/dist/fonts/glyphicons-halflings-regular.ttf Failed to load resource: the server responded with a status of 404 (Introuvable)