通过Maven使用SCP上传文件

Question

我尝试使用scp将maven创建的耳朵上传到应用程序服务器。

当我试图运行

mvn wagon:upload-single 

，但我得到了以下错误：

 
[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 

我试图把它添加到POM，但它似乎并没有产生任何影响：

添加以下到pom.xml中：

... 
    <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> 
.... 

有人可以解释我可以如何做这项工作？

Answer 1

您当前的配置遵循Usage页面中给出的示例并且是正确的。但是，在此示例中，configuration元素在execution内声明，因此仅适用于此特定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。

如果你想调用的命令行插件，或者使用-Durl=foo通过命令行参数等，或添加一个“全球性” configuration元素：

<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>