使用Maven通过SCP上载文件失败 [英] Uploading a File via SCP with Maven fails

问题描述

我尝试使用scp将maven创建的耳朵上传到应用程序服务器.

I try to upload an ear created by maven to an application server using scp.

当我尝试运行

mvn wagon:upload-single

但是出现以下错误:

[ERROR] Failed to execute goal org.codehaus.mojo:wagon-maven-plugin:1.0-beta-3:upload-single (default-cli) on project de.volkswagen.dps.ear: Unable to create a Wagon instance for null: url can not be null -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:wagon-maven-plugin:1.0-beta-3:upload-single (default-cli) on project de.volkswagen.dps.ear: Unable to create a Wagon instance for null
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:585)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:324)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:247)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:104)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:427)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:157)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:121)
    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.MojoExecutionException: Unable to create a Wagon instance for null
    at org.codehaus.mojo.wagon.AbstractWagonMojo.createWagon(AbstractWagonMojo.java:83)
    at org.codehaus.mojo.wagon.AbstractSingleWagonMojo.execute(AbstractSingleWagonMojo.java:62)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:105)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:577)
    ... 14 more
Caused by: java.lang.NullPointerException: url can not be null
    at org.apache.maven.wagon.repository.Repository.(Repository.java:88)
    at org.codehaus.mojo.wagon.shared.WagonUtils.createWagon(WagonUtils.java:51)
    at org.codehaus.mojo.wagon.AbstractWagonMojo.createWagon(AbstractWagonMojo.java:79)
    ... 17 more

我试图将其添加到pom中，但似乎没有任何作用:

I tried to add this to the pom, but it doesn't seem to have any effect:

我在pom.xml中添加了以下内容:

I added the following to the pom.xml:

...
    <extensions>
        <extension>
            <groupId>org.apache.maven.wagon</groupId>
            <artifactId>wagon-ssh</artifactId>
            <version>1.0-beta-6</version>
        </extension>
    </extensions>

    <plugins>

        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>wagon-maven-plugin</artifactId>
            <version>1.0-beta-3</version>
            <executions>
                <execution>
                    <id>upload-ear</id>
                    <phase>deploy</phase>
                    <goals>
                        <goal>upload</goal>
                    </goals>
                    <configuration>
                        <fromFile>${project.build.directory}/${project.build.finalName}.ear</fromFile> 
                        <url>scp://servername/</url>
                        <toDir>.</toDir>
                    </configuration>
                </execution>
            </executions>
        </plugin>
....

有人可以解释我如何进行这项工作吗?

Can anybody explain how I can make this work?

推荐答案

您当前的配置遵循

Your current configuration follows the example given in the Usage page and is correct. However, in this example the configuration element is declared inside an execution and thus only applies to this particular execution.

因此，当您在命令行上调用mvn wagon:upload-single时，configuration未被使用"，并且确实没有配置url参数.

So when you call mvn wagon:upload-single on the command line, the configuration isn't "used" and there is indeed no url parameter configured.

如果要从命令行调用插件，请使用-Durl=foo等在命令行中传递参数，或添加全局" configuration元素:

If you want to call the plugin from the command line, either pass the parameters on the command line using -Durl=foo and so on or add a "global" configuration element:

<build>
  <extensions>
    <extension>
      <groupId>org.apache.maven.wagon</groupId>
      <artifactId>wagon-ssh</artifactId>
      <version>1.0-beta-6</version>
    </extension>
  </extensions>  

  <plugins>   
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>wagon-maven-plugin</artifactId>
      <version>1.0-beta-3</version>
      <configuration>
        <fromFile>${project.build.directory}/${project.build.finalName}.ear</fromFile> 
        <url>scp://servername/</url>
        <toDir>.</toDir>
      </configuration>
      ...
    </plugin>
    ...
  </plugins>
  ...
</build>

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