Release:perform fails on releasing a tag from an empty directory
----------------------------------------------------------------

                 Key: MRELEASE-654
                 URL: http://jira.codehaus.org/browse/MRELEASE-654
             Project: Maven 2.x Release Plugin
          Issue Type: Bug
          Components: perform
    Affects Versions: 2.1
         Environment: Apache Maven 3.0.2 (r1056850; 2011-01-09 01:58:10+0100)
Java version: 1.6.0_22, vendor: Sun Microsystems Inc.
OS name: "linux", version: "2.6.35-25-generic", arch: "amd64", family: "unix"
            Reporter: Giacomo Boccardo


If we release our project from the same directory when we executed the 
release:prepare the perform phase completes successfully, while performing a 
release from a tag (in an empty directory) we have the following stack trace:

{noformat}
$ mvn release:perform -Dtag=unilet-base-5.3.13 
-DconnectionUrl=scm:svn:https://srvdevel.unimatica.lan/svn/unilet -X

Apache Maven 3.0.2 (r1056850; 2011-01-09 01:58:10+0100)
Java version: 1.6.0_22, vendor: Sun Microsystems Inc.
Java home: /usr/lib/jvm/java-6-sun-1.6.0.22/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.35-25-generic", arch: "amd64", family: "unix"
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from /usr/local/app/maven/conf/settings.xml
[DEBUG] Reading user settings from /home/gboccardo/.m2/settings.xml
[DEBUG] Using local repository at /home/gboccardo/.m2/repository
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for 
/home/gboccardo/.m2/repository
[INFO] Scanning for projects...
[DEBUG] Extension realms for project org.apache.maven:standalone-pom:pom:1: 
(none)
[DEBUG] Looking up lifecyle mappings for packaging pom from 
ClassRealm[plexus.core, parent: null]
[DEBUG] Resolving plugin prefix release from [org.apache.maven.plugins, 
org.codehaus.mojo]
[DEBUG] Resolved plugin prefix release to 
org.apache.maven.plugins:maven-release-plugin from POM 
org.apache.maven:standalone-pom:pom:1
[DEBUG] === REACTOR BUILD PLAN ================================================
[DEBUG] Project: org.apache.maven:standalone-pom:pom:1
[DEBUG] Tasks:   [release:perform]
[DEBUG] Style:   Aggregating
[DEBUG] =======================================================================
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[DEBUG] Resolving plugin prefix release from [org.apache.maven.plugins, 
org.codehaus.mojo]
[DEBUG] Resolved plugin prefix release to 
org.apache.maven.plugins:maven-release-plugin from POM 
org.apache.maven:standalone-pom:pom:1
[DEBUG] Lifecycle default -> [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]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] === PROJECT BUILD PLAN ================================================
[DEBUG] Project:       org.apache.maven:standalone-pom:1
[DEBUG] Dependencies (collect): []
[DEBUG] Dependencies (resolve): []
[DEBUG] Repositories (dependencies): [unimatica-m2-snapshot-repository 
(http://coderepository.unimatica.lan/dev2/maven2-snapshot, releases=true, 
snapshots=true, managed=false), unimatica-m2-coderepository 
(http://coderepository.unimatica.lan/dev2/maven2, releases=true, 
snapshots=true, managed=false), central (http://repo1.maven.org/maven2, 
releases=true, snapshots=false, managed=false)]
[DEBUG] Repositories (plugins)     : [central (http://repo1.maven.org/maven2, 
releases=true, snapshots=false, managed=false)]
[DEBUG] -----------------------------------------------------------------------
[DEBUG] Goal:          
org.apache.maven.plugins:maven-release-plugin:2.0:perform (default-cli)
[DEBUG] Style:         Aggregating
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <arguments>${arguments}</arguments>
  <basedir>${basedir}</basedir>
  <connectionUrl>${connectionUrl}</connectionUrl>
  <goals>${goals}</goals>
  <javaHome default-value="${java.home}"/>
  <localCheckout default-value="false">${localCheckout}</localCheckout>
  <localRepoDirectory default-value="${maven.repo.local}"/>
  <mavenExecutorId default-value="invoker">${mavenExecutorId}</mavenExecutorId>
  <mavenHome default-value="${maven.home}"/>
  <password>${password}</password>
  <pomFileName>${pomFileName}</pomFileName>
  <project>${project}</project>
  <reactorProjects>${reactorProjects}</reactorProjects>
  <releaseProfiles>${releaseProfiles}</releaseProfiles>
  <scmCommentPrefix default-value="[maven-release-plugin] 
">${scmCommentPrefix}</scmCommentPrefix>
  <settings>${settings}</settings>
  <tag>${tag}</tag>
  <tagBase>${tagBase}</tagBase>
  <useReleaseProfile 
default-value="true">${useReleaseProfile}</useReleaseProfile>
  <username>${username}</username>
  <workingDirectory 
default-value="${project.build.directory}/checkout">${workingDirectory}</workingDirectory>
</configuration>
[DEBUG] =======================================================================
[INFO] 
[INFO] --- maven-release-plugin:2.0:perform (default-cli) @ standalone-pom ---
[DEBUG] org.apache.maven.plugins:maven-release-plugin:jar:2.0:
[DEBUG]    org.apache.maven:maven-plugin-api:jar:2.0.9:compile
[DEBUG]    org.apache.maven.release:maven-release-manager:jar:2.0:compile
[DEBUG]       
org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-9:compile
[DEBUG]          junit:junit:jar:3.8.1:compile
[DEBUG]       
org.codehaus.plexus:plexus-interactivity-api:jar:1.0-alpha-6:compile
[DEBUG]       org.apache.maven:maven-artifact:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-artifact-manager:jar:2.0.9:compile
[DEBUG]       org.apache.maven.shared:maven-invoker:jar:2.0.9:compile
[DEBUG]       commons-lang:commons-lang:jar:2.4:compile
[DEBUG]       commons-cli:commons-cli:jar:1.0:compile
[DEBUG]          commons-logging:commons-logging:jar:1.0:compile
[DEBUG]       org.apache.maven.scm:maven-scm-providers-standard:pom:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-accurev:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-bazaar:jar:1.3:runtime
[DEBUG]             regexp:regexp:jar:1.3:runtime
[DEBUG]          
org.apache.maven.scm:maven-scm-provider-clearcase:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-cvsexe:jar:1.3:runtime
[DEBUG]             
org.apache.maven.scm:maven-scm-provider-cvs-commons:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-cvsjava:jar:1.3:runtime
[DEBUG]             org.netbeans.lib:cvsclient:jar:20060125:runtime
[DEBUG]             ch.ethz.ganymed:ganymed-ssh2:jar:build210:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-gitexe:jar:1.3:runtime
[DEBUG]             
org.apache.maven.scm:maven-scm-provider-git-commons:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-hg:jar:1.3:runtime
[DEBUG]          
org.apache.maven.scm:maven-scm-provider-perforce:jar:1.3:runtime
[DEBUG]          
org.apache.maven.scm:maven-scm-provider-starteam:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-svnexe:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-synergy:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-vss:jar:1.3:runtime
[DEBUG]          org.apache.maven.scm:maven-scm-provider-tfs:jar:1.3:runtime
[DEBUG]       org.apache.maven.scm:maven-scm-manager-plexus:jar:1.3:runtime
[DEBUG]       
org.apache.maven.scm:maven-scm-provider-svn-commons:jar:1.3:compile
[DEBUG]       jaxen:jaxen:jar:1.1-beta-8:runtime
[DEBUG]          jdom:jdom:jar:1.0:runtime
[DEBUG]    org.apache.maven:maven-model:jar:2.0.9:compile
[DEBUG]    org.apache.maven:maven-core:jar:2.0.9:compile
[DEBUG]       
org.apache.maven:maven-plugin-parameter-documenter:jar:2.0.9:compile
[DEBUG]       org.apache.maven.reporting:maven-reporting-api:jar:2.0.9:compile
[DEBUG]          org.apache.maven.doxia:doxia-sink-api:jar:1.0-alpha-10:compile
[DEBUG]       org.apache.maven:maven-profile:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-repository-metadata:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-error-diagnostics:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-plugin-descriptor:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-monitor:jar:2.0.9:compile
[DEBUG]       classworlds:classworlds:jar:1.1:compile
[DEBUG]    org.apache.maven:maven-project:jar:2.0.9:compile
[DEBUG]       org.apache.maven:maven-plugin-registry:jar:2.0.9:compile
[DEBUG]    org.apache.maven:maven-settings:jar:2.0.9:compile
[DEBUG]    org.apache.maven.scm:maven-scm-api:jar:1.3:compile
[DEBUG]    org.codehaus.plexus:plexus-utils:jar:1.5.6:compile
[DEBUG]    org.jdom:jdom:jar:1.1:compile
[DEBUG] Created new class realm maven.api
[DEBUG] Importing foreign packages into class realm maven.api
[DEBUG]   Imported: org.apache.maven.wagon.events < plexus.core
[DEBUG]   Imported: org.sonatype.aether.transfer < plexus.core
[DEBUG]   Imported: org.apache.maven.exception < plexus.core
[DEBUG]   Imported: org.sonatype.aether.metadata < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.Xpp3Dom < plexus.core
[DEBUG]   Imported: org.sonatype.aether.collection < plexus.core
[DEBUG]   Imported: org.sonatype.aether.version < plexus.core
[DEBUG]   Imported: org.apache.maven.monitor < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.repository < plexus.core
[DEBUG]   Imported: org.apache.maven.repository < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.resource < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.logging < plexus.core
[DEBUG]   Imported: org.apache.maven.profiles < plexus.core
[DEBUG]   Imported: org.sonatype.aether.repository < plexus.core
[DEBUG]   Imported: org.apache.maven.classrealm < plexus.core
[DEBUG]   Imported: org.apache.maven.execution < plexus.core
[DEBUG]   Imported: org.sonatype.aether.artifact < plexus.core
[DEBUG]   Imported: org.sonatype.aether.spi < plexus.core
[DEBUG]   Imported: org.apache.maven.reporting < plexus.core
[DEBUG]   Imported: org.apache.maven.usability < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.container < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.component < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlSerializer < 
plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.authentication < plexus.core
[DEBUG]   Imported: org.apache.maven.lifecycle < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.classworlds < plexus.core
[DEBUG]   Imported: org.sonatype.aether.graph < plexus.core
[DEBUG]   Imported: org.sonatype.aether.* < plexus.core
[DEBUG]   Imported: org.apache.maven.settings < plexus.core
[DEBUG]   Imported: org.codehaus.classworlds < plexus.core
[DEBUG]   Imported: org.sonatype.aether.impl < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.* < plexus.core
[DEBUG]   Imported: org.apache.maven.toolchain < plexus.core
[DEBUG]   Imported: org.sonatype.aether.deployment < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.observers < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlPullParserException < 
plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlPullParser < 
plexus.core
[DEBUG]   Imported: org.apache.maven.configuration < plexus.core
[DEBUG]   Imported: org.apache.maven.cli < plexus.core
[DEBUG]   Imported: org.sonatype.aether.installation < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.context < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.authorization < plexus.core
[DEBUG]   Imported: org.apache.maven.project < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.lifecycle < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.configuration < plexus.core
[DEBUG]   Imported: org.apache.maven.artifact < plexus.core
[DEBUG]   Imported: org.apache.maven.model < plexus.core
[DEBUG]   Imported: org.apache.maven.* < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.proxy < plexus.core
[DEBUG]   Imported: org.sonatype.aether.resolution < plexus.core
[DEBUG]   Imported: org.apache.maven.plugin < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.* < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.personality < plexus.core
[DEBUG] Populating class realm maven.api
[DEBUG] Created new class realm 
plugin>org.apache.maven.plugins:maven-release-plugin:2.0
[DEBUG] Importing foreign packages into class realm 
plugin>org.apache.maven.plugins:maven-release-plugin:2.0
[DEBUG]   Imported:  < maven.api
[DEBUG] Populating class realm 
plugin>org.apache.maven.plugins:maven-release-plugin:2.0
[DEBUG]   Included: org.apache.maven.plugins:maven-release-plugin:jar:2.0
[DEBUG]   Included: org.apache.maven.release:maven-release-manager:jar:2.0
[DEBUG]   Included: junit:junit:jar:3.8.1
[DEBUG]   Included: org.codehaus.plexus:plexus-interactivity-api:jar:1.0-alpha-6
[DEBUG]   Included: org.apache.maven.shared:maven-invoker:jar:2.0.9
[DEBUG]   Included: commons-lang:commons-lang:jar:2.4
[DEBUG]   Included: commons-cli:commons-cli:jar:1.0
[DEBUG]   Included: commons-logging:commons-logging:jar:1.0
[DEBUG]   Included: org.apache.maven.scm:maven-scm-providers-standard:pom:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-accurev:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-bazaar:jar:1.3
[DEBUG]   Included: regexp:regexp:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-clearcase:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-cvsexe:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-cvs-commons:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-cvsjava:jar:1.3
[DEBUG]   Included: org.netbeans.lib:cvsclient:jar:20060125
[DEBUG]   Included: ch.ethz.ganymed:ganymed-ssh2:jar:build210
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-gitexe:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-git-commons:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-hg:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-perforce:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-starteam:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-svnexe:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-synergy:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-vss:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-tfs:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-manager-plexus:jar:1.3
[DEBUG]   Included: org.apache.maven.scm:maven-scm-provider-svn-commons:jar:1.3
[DEBUG]   Included: jaxen:jaxen:jar:1.1-beta-8
[DEBUG]   Included: jdom:jdom:jar:1.0
[DEBUG]   Included: org.apache.maven.reporting:maven-reporting-api:jar:2.0.9
[DEBUG]   Included: org.apache.maven.doxia:doxia-sink-api:jar:1.0-alpha-10
[DEBUG]   Included: org.apache.maven.scm:maven-scm-api:jar:1.3
[DEBUG]   Included: org.codehaus.plexus:plexus-utils:jar:1.5.6
[DEBUG]   Included: org.jdom:jdom:jar:1.1
[DEBUG]   Excluded: org.apache.maven:maven-plugin-api:jar:2.0.9
[DEBUG]   Excluded: org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-9
[DEBUG]   Excluded: org.apache.maven:maven-artifact:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-artifact-manager:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-model:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-core:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-plugin-parameter-documenter:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-profile:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-repository-metadata:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-error-diagnostics:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-plugin-descriptor:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-monitor:jar:2.0.9
[DEBUG]   Excluded: classworlds:classworlds:jar:1.1
[DEBUG]   Excluded: org.apache.maven:maven-project:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-plugin-registry:jar:2.0.9
[DEBUG]   Excluded: org.apache.maven:maven-settings:jar:2.0.9
[DEBUG] Configuring mojo 
org.apache.maven.plugins:maven-release-plugin:2.0:perform from plugin realm 
ClassRealm[plugin>org.apache.maven.plugins:maven-release-plugin:2.0, parent: 
sun.misc.Launcher$AppClassLoader@5acac268]
[DEBUG] Configuring mojo 
'org.apache.maven.plugins:maven-release-plugin:2.0:perform' with basic 
configurator -->
[DEBUG]   (s) basedir = /tmp
[DEBUG]   (f) connectionUrl = scm:svn:https://srvdevel.unimatica.lan/svn/unilet
[DEBUG]   (f) javaHome = /usr/lib/jvm/java-6-sun-1.6.0.22/jre
[DEBUG]   (f) localCheckout = false
[DEBUG]   (f) mavenExecutorId = invoker
[DEBUG]   (f) mavenHome = /usr/local/app/maven
[DEBUG]   (f) project = MavenProject: org.apache.maven:standalone-pom:1 @ 
[DEBUG]   (f) reactorProjects = [MavenProject: 
org.apache.maven:standalone-pom:1 @ ]
[DEBUG]   (f) scmCommentPrefix = [maven-release-plugin] 
[DEBUG]   (f) settings = org.apache.maven.execution.SettingsAdapter@4f536eec
[DEBUG]   (f) tag = unilet-base-5.3.13
[DEBUG]   (f) useReleaseProfile = true
[DEBUG]   (f) workingDirectory = /tmp/${project.basedir}/target/checkout
[DEBUG] -- end configuration --
[16:01:40]<-----------------------------------------------------------------/tmp------------------------------------------------------------------>[15/02/11]
[INFO] Checking out the project to perform the release ...
[INFO] Executing: /bin/sh -c cd /tmp/${project.basedir}/target && svn 
--non-interactive checkout 
https://srvdevel.unimatica.lan/svn/unilet/tags/unilet-base-5.3.13 
'/tmp/${project.basedir}/target/checkout'
[INFO] Working directory: /tmp/${project.basedir}/target
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.134s
[INFO] Finished at: Tue Feb 15 16:01:40 CET 2011
[INFO] Final Memory: 7M/154M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-release-plugin:2.0:perform (default-cli) on 
project standalone-pom: Execution default-cli of goal 
org.apache.maven.plugins:maven-release-plugin:2.0:perform failed. 
NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal 
org.apache.maven.plugins:maven-release-plugin:2.0:perform (default-cli) on 
project standalone-pom: Execution default-cli of goal 
org.apache.maven.plugins:maven-release-plugin:2.0:perform failed.
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
        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:84)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:534)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution 
default-cli of goal org.apache.maven.plugins:maven-release-plugin:2.0:perform 
failed.
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:116)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: java.lang.NullPointerException
        at 
org.apache.maven.shared.release.util.ReleaseUtil.getCommonBasedir(ReleaseUtil.java:188)
        at 
org.apache.maven.shared.release.util.ReleaseUtil.getCommonBasedir(ReleaseUtil.java:177)
        at 
org.apache.maven.shared.release.phase.CheckoutProjectFromScm.execute(CheckoutProjectFromScm.java:157)
        at 
org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:343)
        at 
org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:289)
        at 
org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:269)
        at 
org.apache.maven.plugins.release.PerformReleaseMojo.execute(PerformReleaseMojo.java:131)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107)
        ... 20 more
[ERROR] 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please 
read the following articles:
[ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
{noformat}


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