Console Output

Started calculate disk usage of build
Finished Calculation of disk usage of build in 0 seconds
Started calculate disk usage of workspace
Finished Calculation of disk usage of workspace in 0 seconds
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building blueBell - Android Application 1.0-ALPHA-1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:3.0.0:clean (default-clean) @ bluebell-application ---
[INFO] 
[INFO] --- buildnumber-maven-plugin:1.4:create (default) @ bluebell-application ---
[INFO] ShortRevision tag detected. The value is '12'.
[INFO] Executing: /bin/sh -c cd '/var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell' && 'git' 'rev-parse' '--verify' '--short=12' 'HEAD'
[INFO] Working directory: /var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell
[INFO] Storing buildNumber: 111aab00b338 at timestamp: 1542475937469
[WARNING] Cannot get the branch information from the git repository: 
Detecting the current branch failed: fatal: ref HEAD is not a symbolic ref

[INFO] ShortRevision tag detected. The value is '12'.
[INFO] Executing: /bin/sh -c cd '/var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell' && 'git' 'rev-parse' '--verify' '--short=12' 'HEAD'
[INFO] Working directory: /var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell
[INFO] Storing buildScmBranch: UNKNOWN
[INFO] 
[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce-maven) @ bluebell-application ---
[INFO] 
[INFO] --- maven-antrun-plugin:1.7:run (generate-and-print-build-description) @ bluebell-application ---
[INFO] Executing tasks

main:
     [echo] DESCRIPTION: 1.0-ALPHA-1-SNAPSHOT- UNKNOWN
     [echo] Java Version: 1.8.0_111 -source 1.7 -target 1.7
[INFO] Executed tasks
[INFO] 
[INFO] --- android-maven-plugin:4.3.0:generate-sources (default-generate-sources) @ bluebell-application ---
[INFO] Manifest copied from /var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell/src/main/AndroidManifest.xml to /var/jenkins_home/jobs/blueBell_Build_and_Test/workspace/modules/blueBell/target/AndroidManifest.xml
[INFO] Extracting libs
[INFO] Generating R file for it.tidalwave.bluebell:bluebell-application:apk:1.0-ALPHA-1-SNAPSHOT
[JENKINS] Archiving disabled