maven release:prepare IOException

I'm trying to get maven's release plugin working with Perforce. When I run:

mvn release:prepare -Dusername=PerforceUser -Dpassword=PerforcePassword

I get this output (with some IPs/username/passwords removed):

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:                                                                                         [INFO]
[INFO] root-project
[INFO] project1
[INFO] project2
[INFO] project3
[INFO] project4
[INFO] project5
[INFO] project6
[INFO] project7
[INFO] project8
[INFO] project9
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building root-project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-release-plugin:2.3.1:prepare (default-cli) @ root-project ---
[INFO] Verifying that there are no local modifications...
[INFO]   ignoring changes on: **\release.properties, **\pom.xml.next, **\pom.xml.releaseBackup, **\pom.xml.backup, **\pom.xml.bran
ch, **\pom.xml.tag
[ERROR] Path 'D:\Server\pom.xml' is not under client's root '/cygdrive/d/Server'.
[INFO] Checking dependencies and plugins for snapshots ...
What is the release version for "root-project"? (com.company:root-project) 1.0: :
What is SCM release tag or label for "root-project"? (com.company:root-project) root-project-1.0: :
What is the new development version for "root-project"? (com.company:root-project) 1.1-SNAPSHOT: :
[INFO] Transforming 'root-project'...
[INFO]   Updating project8 to 1.0
[INFO]   Updating project4 to 1.0
[INFO]   Updating project1 to 1.0
[INFO]   Updating project3 to 1.0
[INFO]   Updating project6 to 1.0
[INFO]   Updating project7 to 1.0
[INFO]   Updating project9 to 1.0
[INFO]   Updating project5 to 1.0
java.io.IOException: The filename, directory name, or volume label syntax is incorrect
    at java.io.WinNTFileSystem.canonicalize0(Native Method)
    at java.io.Win32FileSystem.canonicalize(Win32FileSystem.java:396)
    at java.io.File.getCanonicalPath(File.java:559)
    at org.apache.maven.scm.provider.perforce.command.edit.PerforceEditCommand.createCommandLine(PerforceEditCommand.java:109)
    at org.apache.maven.scm.provider.perforce.command.edit.PerforceEditCommand.executeEditCommand(PerforceEditCommand.java:51)
    at org.apache.maven.scm.command.edit.AbstractEditCommand.executeCommand(AbstractEditCommand.java:40)
    at org.apache.maven.scm.command.AbstractCommand.execute(AbstractCommand.java:59)
    at org.apache.maven.scm.provider.perforce.PerforceScmProvider.edit(PerforceScmProvider.java:210)
    at org.apache.maven.scm.provider.AbstractScmProvider.edit(AbstractScmProvider.java:560)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.writePom(AbstractRewritePomsPhase.java:631)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transformProject(AbstractRewritePomsPhase.java:231)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transform(AbstractRewritePomsPhase.java:125)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.execute(AbstractRewritePomsPhase.java:110)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:234)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:169)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:146)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:107)
    at org.apache.maven.plugins.release.PrepareReleaseMojo.prepareRelease(PrepareReleaseMojo.java:291)
    at org.apache.maven.plugins.release.PrepareReleaseMojo.execute(PrepareReleaseMojo.java:247)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    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:537)
    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)
[ERROR] CommandLineException Exit code: 1 - Usage: add/edit/delete [-c changelist#] [ -d -f -k -n -v ] [-t type] files...
Missing/wrong number of arguments.

Command line was:p4 -d D:\Server -p *The-IP-of-Perforce* -u *PerforceUser* -P *PerforcePassword* edit
org.codehaus.plexus.util.cli.CommandLineException: Exit code: 1 - Usage: add/edit/delete [-c changelist#] [ -d -f -k -n -v ] [-t type] files...
Missing/wrong number of arguments.

Command line was:p4 -d D:\Server -p *The-IP-of-Perforce* -u *PerforceUser* -P *PerforcePassword* edit
    at org.apache.maven.scm.provider.perforce.command.edit.PerforceEditCommand.executeEditCommand(PerforceEditCommand.java:71)
    at org.apache.maven.scm.command.edit.AbstractEditCommand.executeCommand(AbstractEditCommand.java:40)
    at org.apache.maven.scm.command.AbstractCommand.execute(AbstractCommand.java:59)
    at org.apache.maven.scm.provider.perforce.PerforceScmProvider.edit(PerforceScmProvider.java:210)
    at org.apache.maven.scm.provider.AbstractScmProvider.edit(AbstractScmProvider.java:560)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.writePom(AbstractRewritePomsPhase.java:631)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transformProject(AbstractRewritePomsPhase.java:231)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.transform(AbstractRewritePomsPhase.java:125)
    at org.apache.maven.shared.release.phase.AbstractRewritePomsPhase.execute(AbstractRewritePomsPhase.java:110)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:234)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:169)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:146)
    at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:107)
    at org.apache.maven.plugins.release.PrepareReleaseMojo.prepareRelease(PrepareReleaseMojo.java:291)
    at org.apache.maven.plugins.release.PrepareReleaseMojo.execute(PrepareReleaseMojo.java:247)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    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:537)
    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)
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] root-project ........................................ FAILURE [22.348s]
[INFO] project1 ............................................ SKIPPED
[INFO] project2 ............................................ SKIPPED
[INFO] project3 ............................................ SKIPPED
[INFO] project4 ............................................ SKIPPED
[INFO] project5 ............................................ SKIPPED
[INFO] project6 ............................................ SKIPPED
[INFO] project7 ............................................ SKIPPED
[INFO] project8 ............................................ SKIPPED
[INFO] project9 ............................................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 22.967s
[INFO] Finished at: Tue Jun 12 15:41:53 BST 2012
[INFO] Final Memory: 8M/154M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.3.1:prepare (default-cli) on project root-project: Error writing POM: D:\Server\pom.xml (Access is denied) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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/MojoExecutionException

This happens both when I run it in cygwin and when I run it in a normal native Windows command prompt.

Before I got this far in the setup, I was sure it managed to write the versions to the pom at least once, but now it doesn't.

Looking at the maven scm provider for perforce source code I can see that on line 93 it creates the basic p4 command line

Commandline command = PerforceScmProvider.createP4Command( repo, workingDirectory );

then on line 95 it adds the edit

command.createArg().setValue( "edit" );

and then inside the try-catch it adds the files. But line 109

String canfile = file.getCanonicalPath();

is throwing the IOException seen above causing the stacktrace to be printed and this is why the file(s) don't get added and the execution of the p4 command fails (which in turn causes the "Access is denied" because it's failing to checkout the file (which is therefore read only).

EDIT:

The reason it throws the IOException is that when it creates the file on line 103:

File file = new File( workingDirectory, fs.get( i ).getPath() );

the fs.get( i ).getPath() returns an absolute path, so file ends up looking like

D:\Server\D:\Server\pom.xml (in my case)

and this is obviously broken.

I've changed the line (and a similar line in PerforceCheckInCommand.java locally to:

File file = null;
if(fs.get( i ).isAbsolute()) file = new File( fs.get( i ).getPath() );
else file = new File( workingDirectory, fs.get( i ).getPath() );

and reinstalled the plugin and now it all works. So the problem is a bug in the plugin causing my particular setup to fail. I've submitted a bug report, so hopefully no one else will experience this, but if they do, download the plugin src, make those two changes and re-install it (mvn install), and it should work.