Question

我正在构建一个Maven应用程序，我想用Java部署在Google应用引擎上。

我试图在本地服务器localhost:8080

中进行测试

当我运行命令mvn clean package时，它会给我一个Build Success提示，如下所示

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.284 s
[INFO] Finished at: 2017-01-06T12:32:58-05:00
[INFO] Final Memory: 29M/400M
[INFO] ------------------------------------------------------------------------

但是当我运行命令mvn appengine:run时，它会给我这个错误消息：

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.259 s
[INFO] Finished at: 2017-01-06T12:33:03-05:00
[INFO] Final Memory: 8M/150M
[INFO] ------------------------------------------------------------------------
[ERROR] Could not find goal 'run' in plugin com.google.appengine:appengine-maven-plugin:1.9.48 among available goals backends_configure, backends_delete, backends_rollback, backends_start, backends_stop, backends_update, create-property, debug, devserver, devserver_start, devserver_stop, endpoints_get_client_lib, endpoints_get_discovery_doc, endpoints_get_swagger_doc, enhance, migrate_traffic, rollback, set_default_version, start_module_version, stop_module_version, update, update_cron, update_dispatch, update_dos, update_indexes, update_queues, vacuum_indexes -> [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/MojoNotFoundException

我在我的pom文件中添加了appengine骨架archtype的插件

<plugin>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>appengine-maven-plugin</artifactId>
    <version>1.0.0</version>
</plugin>

我还将版本更改为云端maven文档中的版本

<plugin>
    <groupId>com.google.appengine</groupId>
    <artifactId>gcloud-maven-plugin</artifactId>
    <version>1.9.48</version>
    <configuration>
        <set_default>true</set_default>
    </configuration>
</plugin>

我仍然遇到上述错误。

我猜测的是我缺少一些插件。我想知道如何在本地运行我的应用程序以及制作mvn appengine:run work

时缺少的内容

修改

现在有了下面给出的修复，我收到了这个错误：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.2:compile (default-compile) on project java-adwords: Compilation failure
[ERROR] /home/seraf/java-adwords-maven/java-adwords/src/main/java/myApp/adwords_axis/MainApp.java:[11,19] doGet(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) in adwords_axis.MainApp cannot override doGet(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) in javax.servlet.http.HttpServlet
[ERROR] overridden method does not throw java.lang.Exception
[ERROR] -> [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/MojoFailureException

但这是我的java主代码，它会抛出异常：

      public void doGet(HttpServletRequest request, HttpServletResponse response)                                                                              
          throws Exception {                                                    

          response.setContentType("text/plain");                                
          response.getWriter().println("Test");                                 
          run();                                                                

      }

Answer 1

根据Google App Engine文档，您可以使用两个插件处理App Engine maven命令：

如果您想使用基于appcfg的版本，请使用以下插件

<plugin>
    <groupId>com.google.appengine</groupId>
    <artifactId>gcloud-maven-plugin</artifactId>
    <version>1.9.48</version>
    <configuration>
        <set_default>true</set_default>
    </configuration>
</plugin>

本地服务器和部署的命令将是

 - mvn appengine:devserver
 - mvn appengine:update

如果您想使用基于Gloud SDK的版本，请使用以下插件

<plugin>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>appengine-maven-plugin</artifactId>
    <version>1.0.0</version>
</plugin>

本地服务器和部署的命令将是

 - mvn appengine:run
 - mvn appengine:deploy

如果要使用这两个插件，可能需要使用以下命令：

 - mvn com.google.appengine:appengine-maven-plugin:devserver
 - mvn com.google.appengine:appengine-maven-plugin:update
 - mvn com.google.cloud.tools:appengine-maven-plugin:run
 - mvn com.google.cloud.tools:appengine-maven-plugin:deploy

（如此thread中所述）

您还可以在此thread

中找到更多信息

Answer 2

无法找到目标run，因为该插件没有此类目标。我相信你在寻找appengine:devserver。请参阅Using Apache Maven and the App Engine Plugin中的使用开发服务器测试您的应用部分。

参考上面编辑中显示的第二个问题。答案很神秘，指出抛出异常的问题。您的overriden方法必须抛出相同的异常，不仅IOException而且ServletException。

使用更复杂的库（例如javax.servlet.*）时，最好让IDE创建方法存根以避免这些类型的错误。虽然，我有点惊讶它首先没有发出警告或错误。

无法在插件com.google.appengine：appengine-maven-plugin中找到目标'run'

2 个答案: