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From <org.apache.maven.u...@io7m.com>
Subject NullPointerException in SSH wagon
Date Wed, 24 Apr 2013 15:41:08 GMT
'Lo.

We're running into the following:

[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-gpg-plugin:1.4:sign-and-deploy-file
(default-cli) on project test: Error deploying attached artifact
test-javadoc.jar: Failed to deploy artifacts: Could not transfer
artifact com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to
execute goal
org.apache.maven.plugins:maven-gpg-plugin:1.4:sign-and-deploy-file
(default-cli) on project test: Error deploying attached artifact
test-javadoc.jar: Failed to deploy artifacts: Could not transfer
artifact com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
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:320) 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:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601) 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.MojoExecutionException: Error
deploying attached artifact test-javadoc.jar: Failed to deploy
artifacts: Could not transfer artifact
com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException at
org.apache.maven.plugin.gpg.SignAndDeployFileMojo.execute(SignAndDeployFileMojo.java:503)
at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) ...
19 more Caused by:
org.apache.maven.artifact.deployer.ArtifactDeploymentException: Failed
to deploy artifacts: Could not transfer artifact
com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException at
org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy(DefaultArtifactDeployer.java:141)
at
org.apache.maven.plugin.gpg.SignAndDeployFileMojo.deploy(SignAndDeployFileMojo.java:688)
at
org.apache.maven.plugin.gpg.SignAndDeployFileMojo.execute(SignAndDeployFileMojo.java:499)
...
21 more Caused by: org.sonatype.aether.deployment.DeploymentException:
Failed to deploy artifacts: Could not transfer artifact
com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException at
org.sonatype.aether.impl.internal.DefaultDeployer.deploy(DefaultDeployer.java:280)
at
org.sonatype.aether.impl.internal.DefaultDeployer.deploy(DefaultDeployer.java:211)
at
org.sonatype.aether.impl.internal.DefaultRepositorySystem.deploy(DefaultRepositorySystem.java:443)
at
org.apache.maven.artifact.deployer.DefaultArtifactDeployer.deploy(DefaultArtifactDeployer.java:137)
...
23 more Caused by:
org.sonatype.aether.transfer.ArtifactTransferException: Could not
transfer artifact com.example:test:jar:javadoc:1.0.0 from/to temp-repos
(scpexe://core/tmp/repos): NullPointerException at
org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:951)
at
org.sonatype.aether.connector.wagon.WagonRepositoryConnector$4.wrap(WagonRepositoryConnector.java:941)
at
org.sonatype.aether.connector.wagon.WagonRepositoryConnector$PutTask.run(WagonRepositoryConnector.java:837)
at
org.sonatype.aether.connector.wagon.WagonRepositoryConnector.put(WagonRepositoryConnector.java:467)
at
org.sonatype.aether.impl.internal.DefaultDeployer.deploy(DefaultDeployer.java:274) ...
26 more Caused by: java.lang.NullPointerException at
org.apache.maven.wagon.providers.ssh.external.ScpExternalWagon.executeScpCommand(ScpExternalWagon.java:275)
at
org.apache.maven.wagon.providers.ssh.external.ScpExternalWagon.put(ScpExternalWagon.java:403)
at
org.sonatype.aether.connector.wagon.WagonRepositoryConnector$PutTask.run(WagonRepositoryConnector.java:811)
...
28 more

I've managed to get it down to a simple case that reproduces the
problem:

  https://github.com/io7m/maven-wagon-bug-20130424

To try it, edit run.sh and change the repository URI to the name of a
server to which you have scp access. Then execute run.sh. The wagon
plugin will crash when attempting to copy the javadoc.jar.

A brief look at ScpExternalWagon.java:275 shows that the code at that
line is:

  cl.setWorkingDirectory(localFile.getParentFile().getAbsolutePath());

Is this plugin still maintained? The bug tracker looks somewhat
abandoned and the mailing lists appear to be gone (the only valid link
is to this list).

M

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