运行Google快速启动错误:缺少用于com.google.appengine:appengine-maven-plugin:jar:1.9.24的POM

Question

任何帮助我克服这一错误将不胜感激。谷歌搜索似乎找不到任何有用的结果。我在Macbook Pro上运行，并使用1.7.0_71和Maven 3.3。Maven是通过HomeBrew安装的。

为了了解Google的介绍，我遵循了从https://cloud.google.com/appengine/docs/java/gettingstarted/introduction开始快速启动的说明，并在代码上无问题地到达页面说明。在创建guestbook.jsp文件并运行mvn appengine:devserver之后，我将得到以下构建失败。

[INFO] Scanning for projects...
[WARNING] The POM for com.google.appengine:appengine-maven-plugin:jar:1.9.24 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for com.google.appengine:appengine-maven-plugin:1.9.24: Plugin com.google.appengine:appengine-maven-plugin:1.9.24 or one of its dependencies could not be resolved: Failure to find com.google.appengine:appengine-maven-plugin:jar:1.9.24 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 KB at 4.3 KB/sec)
Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (13 KB at 2.2 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.435 s
[INFO] Finished at: 2015-07-22T21:10:29-04:00
[INFO] Final Memory: 10M/245M
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'appengine' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/Users/nissandookeran/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [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/NoPluginFoundForPrefixException

Answer 1

出于任何原因，Appengine插件还没有部署到Maven Central的1.9.24版本。可能最简单的方法是打开您的pom.xml，找到它正在使用的<version> of appengine-maven-plugin，并让它使用1.9.23而不是${appengine.version}或1.9.24或它正在使用的任何东西。

Answer 2

如果是因为新版本，您也可以尝试运行mvn appengine:devserver -U。

Answer 3

您必须在pom文件中包含以下内容

        <plugin>
           <groupId>com.google.cloud.tools</groupId>
           <artifactId>appengine-maven-plugin</artifactId>
           <version>1.9.48</version>
        </plugin>