无法执行目标com.google.appengine:appengine-maven-plugin:1.9.67:devserver

Question

嘿，我在devserver和update调用上启动maven项目时遇到了问题。我构建了我的maven项目来运行google cloud engine，但是我遇到了这个问题，并且无法启动我的服务器。这是我的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>

  <groupId>trainingBuddyServer</groupId>
  <artifactId>Training-Buddy-Server</artifactId>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
    <archiveClasses>true</archiveClasses>
  </properties>

  <prerequisites>
    <maven>3.5</maven>
  </prerequisites>

  <dependencies>
    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-1.0-sdk</artifactId>
      <version>1.9.67</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <type>jar</type>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>22.0</version>
    </dependency>
    <dependency>
      <groupId>com.googlecode.objectify</groupId>
      <artifactId>objectify</artifactId>
      <version>5.1.17</version>
    </dependency>

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-1.0-sdk</artifactId>
      <version>1.9.67</version>
    </dependency>

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-endpoints</artifactId>
      <version>1.9.67</version>
    </dependency>
    <dependency>
      <groupId>com.google.endpoints</groupId>
      <artifactId>endpoints-framework</artifactId>
      <version>2.0.7</version>
    </dependency>
    <dependency>
      <groupId>com.google.endpoints</groupId>
      <artifactId>endpoints-management-control-appengine</artifactId>
      <version>1.0.3</version>
    </dependency>
    <dependency>
      <groupId>com.google.endpoints</groupId>
      <artifactId>endpoints-framework-auth</artifactId>
      <version>1.0.3</version>
    </dependency>

    <!-- Test Dependencies -->
    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-testing</artifactId>
      <version>1.9.67</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-stubs</artifactId>
      <version>1.9.67</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-tools-sdk</artifactId>
      <version>1.9.67</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.google.truth</groupId>
      <artifactId>truth</artifactId>
      <version>0.33</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.mockito</groupId>
      <artifactId>mockito-all</artifactId>
      <version>1.10.19</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <!-- for hot reload of the web application-->
    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
    <plugins>
      <plugin>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-maven-plugin</artifactId>
        <version>1.9.67</version>
        <configuration>
          <appId>trainingbuddy-221215</appId> <!-- Override appengine-web.xml <project> -->
          <version>1</version>
          <fullScanSeconds>1</fullScanSeconds>
          <retainUploadDir>true</retainUploadDir>
        </configuration>
      </plugin>

      <plugin>
           <groupId>com.google.cloud.tools</groupId>
           <artifactId>appengine-maven-plugin</artifactId>
           <version>1.3.1</version>
           <configuration>
              <deploy.promote>true</deploy.promote>
              <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
            </configuration>
        </plugin>

      <plugin>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce-maven</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireMavenVersion>
                  <version>3.5</version>
                </requireMavenVersion>
                <requirePluginVersions>
                   <message>Best Practice is to always define plugin versions!</message>
                   <banLatest>true</banLatest>
                   <banRelease>true</banRelease>
                   <phases>clean,deploy,verify,appengine:run,appengine:deploy,appengine:update,appengine:devappaserver,site</phases>
                </requirePluginVersions>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

我想是pom文件出了问题，因为错误提示找不到这个元素"com.google.appengine:appengine-maven-plugin:1.9.67:devserver".所以这是错误的，如果它有帮助的话：

[INFO] --- appengine-maven-plugin:1.9.67:devserver (default-cli) @ Training-Buddy-Server ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.212 s
[INFO] Finished at: 2018-11-01T23:37:27+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.google.appengine:appengine-maven-plugin:1.9.67:devserver (default-cli) on project Training-Buddy-Server: The parameters 'project' for goal com.google.appengine:appengine-maven-plugin:1.9.67:devserver are missing or invalid -> [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/PluginParameterException

也许有人知道怎么解决这个问题？

Answer 1

添加

    <project>YOUR PROJECT ID</project>

确实也为我解决了这个问题，不过我使用的不是新的gclod maven插件，而是旧的appengine插件：

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

vs我的

    <groupId>com.google.appengine</groupId>
    <artifactId>appengine-maven-plugin</artifactId>

在某种程度上，我可能会转向gcloud插件，但现在我没有时间。

旧的appengine插件也可以使用(未记录的) "project“配置标签。从1.9.67和更高版本开始，谷歌的and (started examples)不起作用，这真是令人困惑，也是糟糕的工作。另外，如果从现在开始需要的话，我们应该已经得到了一些关于它的信息。

为了记录，我发布了我的多模块/服务父pom片段，包括旧的appengine插件的pluginmanagement：

    <pluginManagement>
      <plugins>
          <plugin>
              <groupId>com.google.appengine</groupId>
              <artifactId>appengine-maven-plugin</artifactId>
              <version>${appengine.target.version}</version>
              <configuration>
                  <project>YOUR PROJECT ID</project> <!-- WHAT DO WE NEED THIS FOR-->
                  <jvmFlags>
                      <jvmFlag>-Ddatastore.backing_store=${project.basedir}/local_db.bin</jvmFlag>
                  </jvmFlags>
                  <fullScanSeconds>-1</fullScanSeconds>
              </configuration>
          </plugin>
      </plugins>
  </pluginManagement>

Answer 2

你设法解决这个问题了吗？我已经使用我的多模块项目pom至少3年了，没有任何问题，但是从1.9.67开始，我不再能够通过appengine maven插件部署或运行devserver，出现了相同的错误：

缺少目标项目的参数‘’或该参数无效

使用1.9.65对我来说很有效，所以作为一个短期的解决方案，你应该能够使用那个版本来代替，但是我不知道你允许部署多老的版本。

Answer 3

我用最新的AppEngine也遇到了同样的问题。它在低于1.9.64的版本中工作得很好，但在更高版本中产生了相同的错误。今天我解决了这个问题，我在pom.xml上添加了

  <plugin>
       <groupId>com.google.cloud.tools</groupId>
       <artifactId>appengine-maven-plugin</artifactId>
       <version>1.3.1</version>
       <configuration>
          <project>your project ID on Google Cloud </project>
          <deploy.promote>true</deploy.promote>
          <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
        </configuration>
    </plugin>