无法在项目后端执行目标com.google.cloud.tools:appengine-maven-plugin:2.3.0:rundefault-cli

如何解决无法在项目后端执行目标com.google.cloud.tools:appengine-maven-plugin:2.3.0:rundefault-cli

我正在尝试按照本教程https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible进行操作，但一直出现此错误。尤其是当我运行以下命令时：

MVN清洁包appengine：运行

我也尝试过使用以下命令在Java 8中运行它：

MVN清洁包appengine：run -Djava8 = true

我还尝试过降级到Java 8，仍然没有成功。

[错误]无法在项目后端执行目标com.google.cloud.tools:appengine-maven-plugin:2.3.0:run（default-cli）：无法运行devappserver：com.google.cloud.tools .appengine.operations.cloudsdk.process.ProcessHandlerException：com.google.cloud.tools.appengine.AppEngineException：非零退出：1-> [帮助1]

我的pom.xml文件如下所示

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.google.cloud.solutions.flexenv</groupId>
  <artifactId>backend</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>App Engine Backend module for Firebase</name>
  <url>https://cloud.google.com</url>

  <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>
    <failOnMissingWebXml>false</failOnMissingWebXml>
  </properties>
  <prerequisites>
    <maven>3.5</maven>
  </prerequisites>
  <!--
    The parent pom defines common style checks and testing strategies for our samples.
    Removing or replacing it should not affect the execution of the samples in anyway.
  -->
  <parent>
    <groupId>com.google.cloud.samples</groupId>
    <artifactId>shared-configuration</artifactId>
    <version>1.0.18</version>
  </parent>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.google.cloud</groupId>
        <artifactId>libraries-bom</artifactId>
        <version>10.0.0</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>

    <!-- Compile/runtime dependencies -->
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>google-cloud-logging</artifactId>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.7.4</version>
    </dependency>
    <dependency>
      <groupId>com.google.firebase</groupId>
      <artifactId>firebase-server-sdk</artifactId>
      <version>[3.0.0,)</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>backend</finalName>
    <outputDirectory>target/${project.artifactId}-${project.version}/WEB-INF/classes</outputDirectory>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <version>3.8.1</version>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.1.0</version>
        <configuration>
          <archiveClasses>true</archiveClasses>
          <webResources>
            <!-- in order to interpolate version from pom into appengine-web.xml -->
            <resource>
              <directory>${basedir}/src/main/webapp/WEB-INF</directory>
              <filtering>true</filtering>
              <targetPath>WEB-INF</targetPath>
            </resource>
          </webResources>
        </configuration>
      </plugin>
      <plugin>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>appengine-maven-plugin</artifactId>
        <version>2.3.0</version>
        <configuration>
          <projectId>GCLOUD_CONFIG</projectId>
          <version>GCLOUD_CONFIG</version>
          <promote>true</promote>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

有人可以解释为什么这不起作用

解决方法

我不是Java或Maven的专家，也不知道正在发生什么，但是运行以下命令对我有用：

sudo mvn clean package appengine:run

您也可以尝试：

sudo mvn clean package appengine:deploy

如果显示有关找不到mvn的错误，只需键入mvn所在的路径。