Running maven manually (mvn.bat) or with Jenkins will generate an error (see below)
mvn pom.xml Clean build

Running the command with clean (lower case) every thing works fine
mvn pom.xml clean build

This is a part of Jenkins execution log
<===[JENKINS REMOTING CAPACITY]===>channel started
log4j:WARN No appenders could be found for logger (org.apache.commons.beanutils.converters.BooleanConverter).
log4j:WARN Please initialize the log4j system properly.
Executing Maven: -B -f C:\Users\piv\Documents\NetBeansProjects\LunchGuide\pom.xml Clean build
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for lunchguide:LunchGuide:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 42, column 15
[WARNING] The expression ${artifactId} is deprecated. Please use ${project.artifactId} instead.
[WARNING] The expression ${version} is deprecated. Please use ${project.version} instead.
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Quick Start Archetype 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.218s
[INFO] Finished at: Wed Apr 10 13:49:15 CEST 2013
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[JENKINS] Archiving C:\Users\piv\Documents\NetBeansProjects\LunchGuide\pom.xml to C:\Users\piv\.jenkins\jobs\LunchGuide\modules\lunchguide$LunchGuide\builds\2013-04-10_13-49-13\archive\lunchguide\LunchGuide\1.0-SNAPSHOT\LunchGuide-1.0-SNAPSHOT.pom
Waiting for Jenkins to finish collecting data
mavenExecutionResult exceptions not empty
message : Unknown lifecycle phase "Clean". You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-clean, clean, post-clean, pre-site, site, post-site, site-deploy.

/ Peter Ivarsson