嘿，我在 devserver 上启动 Maven 项目和更新调用时遇到问题。
我建立了我的 Maven 项目来与谷歌云引擎一起运行，但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>
我认为 pom 文件有问题，因为错误表明它找不到此元素“com.google.appengine:appengine-maven-plugin:1.9.67:devserver”。所以如果有帮助的话，这就是错误：
[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
也许有人知道如何解决这个问题？
添加
<project>YOUR PROJECT ID</project>
确实也为我解决了这个问题，但是我没有使用较新的 gclod maven 插件，而是使用较旧的 appengine 插件：
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
vs mine
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
在某些时候，我可能应该转向 gcloud 插件，但现在我没有时间。
旧的 appengine 插件也可以与（未记录的）“project”配置标签一起使用。自从他们得到（开始的例子 https://cloud.google.com/appengine/docs/standard/java/tools/maven) 从 1.9.67 及更高版本起不起作用。另外，如果从现在开始需要的话，我们应该已经获得了一些相关信息。
作为记录，我发布了我的多模块/服务父 pom 片段，包括带有旧 appengine 插件的插件管理：
<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>
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