是否有可能使用应用程序引擎模块和云端点？

Question

使用appengine模块意味着创建动态web应用程序，而不是通常的appengine应用程序项目。云端点可以很好地工作在通常的appengine应用程序项目中，但是这些项目不支持appengine模块。

问题是，如果我试图在动态Web应用程序上生成云端点客户机库，就会出现一个错误“不是App项目”。

是否有任何方法将动态Web应用程序识别为App项目，以便在其上生成云端点客户端库？

Answer 1

这种情况的解决方案在Fran ois POYER的回答中，但是这里有一个没有假设的版本。

如果使用WTP创建和管理应用程序和EAR：

1. 确保您处于Java透视图中
2. 右键单击您的云端点项目=> "Google WTP“=>生成云终端客户端库

如果您没有看到Google WTP，并且只看到"Google"，那么很可能您还没有选择Java透视图。

您不必为此使用maven，只需使用WTP来创建和管理您的EAR和appengine应用程序。

Answer 2

目前正在处理相同的问题，我想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:定义了一些公共值(比如您正在使用的应用程序引擎版本)、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>

当然，EAR模块的pom.xml应该具有EAR打包，但也应该具有对其他模块的"war“类型的依赖，以及设置为”war“的maven-ear插件的"unpack typed”选项：

<?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，应该将“云端点”pom.xml配置为具有"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>

​

在构建这个项目时，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 "Generate Library“将生成myproject-cloud-endpoints/endpoint-libs/中所需的一切”。

希望这能帮上忙！