目前正在解决同样的问题，我想我已经找到了具有以下设置的解决方案（使用 Maven 作为 java 项目）：
在项目根 pom.xml 中：定义了一些常见值（例如您正在使用的 appengine 版本），pom包装和模块，尤其是 EAR 模块：
<?xml version="1.0" encoding="UTF-8"?>
<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>
<groupId>com.example</groupId>
<artifactId>myproject-root</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<name>myproject-root</name>
<properties>
<appengine.app.version>1</appengine.app.version>
<appengine.target.version>1.9.11</appengine.target.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<modules>
<module>myproject-ear</module>
<module>myproject-cloud-endpoints</module>
<module>myproject-backend</module>
</modules>
</project>
EAR 模块的 pom.xml 当然应该有 EAR 打包，但也应该有对其他模块的“war”类型依赖，并且 maven-ear 插件的“unpack types”选项设置为“war”：
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>com.example</groupId>
<artifactId>myproject-root</artifactId>
<version>1.0</version>
</parent>
<groupId>com.example</groupId>
<artifactId>myproject-ear</artifactId>
<version>1.0</version>
<packaging>ear</packaging>
<name>myproject-ear</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<version>2.9</version>
<configuration>
<version>5</version>
<defaultLibBundleDir>lib</defaultLibBundleDir>
<unpackTypes>war</unpackTypes>
<applicationXml>${project.basedir}/src/main/application/META-INF/maven-application.xml</applicationXml>
</configuration>
</plugin>
<plugin>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${appengine.target.version}</version>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.example</groupId>
<artifactId>myproject-cloud-endpoints</artifactId>
<version>1.0</version>
<type>war</type>
</dependency>
<dependency>
<groupId>com.example</groupId>
<artifactId>myproject-backend</artifactId>
<version>1.0</version>
<type>war</type>
</dependency>
</dependencies>
<properties/>
</project>
最后，“cloud-endpoints”pom.xml 应配置为带有“war”打包的基本云端点 webapp 项目：
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>com.example</groupId>
<artifactId>myproject-root</artifactId>
<version>1.0</version>
</parent>
<groupId>com.example</groupId>
<artifactId>myproject-cloud-endpoints</artifactId>
<version>1.0</version>
<packaging>war</packaging>
<name>myproject-cloud-endpoints</name>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>${appengine.target.version}</version>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-endpoints</artifactId>
<version>${appengine.target.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
</dependencies>
<build>
<!-- for hot reload of the web application in devserver-->
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>versions-maven-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>display-dependency-updates</goal>
<goal>display-plugin-updates</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<version>3.1</version>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<webXml>${project.build.directory}/generated-sources/appengine-endpoints/WEB-INF/web.xml</webXml>
<webResources>
<resource>
<!-- this is relative to the pom.xml directory -->
<directory>${project.build.directory}/generated-sources/appengine-endpoints</directory>
<!-- the list has a default value of ** -->
<includes>
<include>WEB-INF/*.discovery</include>
<include>WEB-INF/*.api</include>
</includes>
</resource>
</webResources>
</configuration>
</plugin>
<plugin>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${appengine.target.version}</version>
<configuration>
<enableJarClasses>false</enableJarClasses>
<!-- Comment in the below snippet to bind to all IPs instead of just localhost -->
<!-- address>0.0.0.0</address>
<port>8080</port -->
<!-- Comment in the below snippet to enable local debugging with a remove debugger
like those included with Eclipse or IntelliJ -->
<!-- jvmFlags>
<jvmFlag>-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n</jvmFlag>
</jvmFlags -->
</configuration>
<executions>
<execution>
<goals>
<goal>endpoints_get_discovery_doc</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
构建此项目后，您应该能够通过 Eclipse 生成云端点客户端库：右键单击“cloud-endpoints”项目=>“谷歌应用程序引擎 WTP" => "生成 Cloud Endpoint 客户端库" 将生成myproject-cloud-endpoints/endpoint-libs/.
希望有帮助！
