Downloading: http://3.204.29.172:8081/artifactory...ctions-3.2.pom
[WARNING] Unable to get resource 'commons-collections:commons-collections:pom:3.2' from repository xr-workflow-repository (http://3.204.29.172:8081/artifactory/repo1
): Error transferring file: Connection timed out: connect
Downloading: http://uk.maven.org/maven2/commons-c...ctions-3.2.pom
[WARNING] Unable to get resource 'commons-collections:commons-collections:pom:3.2' from repository central (http://repo1.maven.org/maven2): Error transferring file:
uk.maven.org
Downloading: http://3.204.29.172:8081/artifactory...ctions-3.2.jar
[WARNING] Unable to get resource 'commons-collections:commons-collections:jar:3.2' from repository xr-workflow-repository (http://3.204.29.172:8081/artifactory/repo1
): Error transferring file: Connection timed out: connect
Downloading: http://uk.maven.org/maven2/commons-c...ctions-3.2.jar
[WARNING] Unable to get resource 'commons-collections:commons-collections:jar:3.2' from repository central (http://repo1.maven.org/maven2): Error transferring file:
uk.maven.org
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Failed to resolve artifact.

Missing:
----------
1) commons-collections:commons-collections:jar:3.2

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=commons-collections -DartifactId=commons-collections -Dversion=3.2 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=commons-collections -DartifactId=commons-collections -Dversion=3.2 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -Dreposito
ryId=[id]

Path to dependency:
1) org.apache.maven.plugins:maven-site-plugin:maven-plugin:2.0-beta-7
2) org.apache.maven.doxia:doxia-site-renderer:jar:1.0-alpha-11
3) commons-collections:commons-collections:jar:3.2

----------
1 required artifact is missing.

for artifact:
org.apache.maven.plugins:maven-site-plugin:maven-plugin:2.0-beta-7

from the specified remote repositories:
apache.snapshots (http://people.apache.org/repo/m2-snapshot-repository),
xr-workflow-repository (http://3.204.29.172:8081/artifactory/repo1),
UK (http://uk.maven.org/maven2)



[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 57 seconds
[INFO] Finished at: Mon Dec 30 11:27:01 EST 2013
[INFO] Final Memory: 8M/21M
[INFO] ------------------------------------------------------------------------

How to Resolve this Problem ?