fabric8-maven-plugin 'branch' goal does not accept secure git repo connections

Trying to use the "branch" goal to merge profiles into a fuse git repo. However, when I pass it a gitUrl to clone from (e.g., an existing fuse fabric git repo), it complains about not being able to connect correctly because of authentication. Eg, here's how I pass the command:

mvn compile -Dfabric8.branch.gitUrl=http://admin:admin@postamac.local:8181/git/fabric

But jgit doesn't like passing in the un/pw into the URL like that.. i get this issue:
[ERROR] Failed to command remote repo http://admin:admin@postamac.local:8181/git/fabric due: http://admin@postamac.local:8181/git/fabric: Authentication is required but no CredentialsProvider has been registered
org.eclipse.jgit.api.errors.TransportException: http://admin@postamac.local:8181/git/fabric: Authentication is required but no CredentialsProvider has been registered
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:139)
at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:178)
at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:125)
at io.fabric8.maven.CreateBranchMojo.initGitRepo(CreateBranchMojo.java:169)
at io.fabric8.maven.CreateBranchMojo.execute(CreateBranchMojo.java:107)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:106)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
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:317)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.eclipse.jgit.errors.TransportException: http://admin@postamac.local:8181/git/fabric: Authentication is required but no CredentialsProvider has been registered
at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:498)
at org.eclipse.jgit.transport.TransportHttp.openFetch(TransportHttp.java:309)
at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:136)
at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:122)
at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1115)
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:130)
... 25 more