是否可以使用appengine模块和云端点?

使用appengine模块意味着创建动态web应用程序，而不是通常的appengine web应用程序项目。云端点与通常的appengine Web应用程序项目一起工作得很好，但这些项目不支持appengine模块。

问题是，如果我尝试在动态Web应用程序上生成云端点客户端库，我得到一个错误"不是一个应用引擎项目"。

是否有任何方法可以使动态Web应用程序被识别为应用程序引擎项目，以便可以在其上生成云端点客户端库?

目前正在处理相同的问题，我认为我已经找到了以下设置的解决方案(在java项目中使用maven):

在项目根pom.xml中:定义了一些常用值(如您正在使用的appengine版本)，pom打包和模块，特别是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当然应该包含EAR打包，但也应该包含对其他模块的"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应该配置为一个基本的云端点webapp项目，带有"war"包装:

<?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，您应该能够通过Eclipse生成您的云端点客户端库:右键单击"云端点"项目=>"Google App Engine WTP"=>"生成云端点客户端库"将生成myproject-cloud-endpoints/endpoint-libs/中所需的一切。

希望有帮助!

这种情况的解决方案在francois POYER答案中，但这里是一个不假设maven的版本。

如果您使用WTP来创建和管理您的appengine应用程序和EAR:

确保您处于Java EE透视图
右键单击你的云端点项目=> "Google App Engine WTP" => "Generate cloud Endpoint Client Library"

如果你没有看到Google App Engine WTP，你只看到"Google"，很可能你没有选择Java EE透视图。

您不必使用maven，只需使用WTP来创建和管理您的ear和appengine应用程序。

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