将Eclipse App Engine项目转换为Maven？

Question

我有一个已经向AppEngine发布了几个版本的项目。在I / O和Cloud Platform事件中观看会话让我对推送部署和实时断点感到兴奋。添加额外的奖金，如Maven管理依赖项的能力，Maven对这个项目非常有吸引力。

该项目只是一个Eclipse项目，通过New＆gt;创建。 Google＆gt; Eclipse中的Web应用程序项目。目前它只是使用内置的Eclipse / Google Plugin构建。

我已完成以下任务：

• Ran m2eclipse转换。
• 将源移动到Maven标准目录结构中。
• 从lib /文件夹中删除Maven可用的依赖项并添加到Maven。
• Maven Build和Maven Unit Test都成功。
• Ran mvn eclipse：eclipse重新构建配置，然后重新添加GAE SDK到 Java Build Path，因此Eclipse的Google插件可以看到它。

我仍然有一些问题，但是......

1. 本地调试/运行会导致java.lang.NoClassDefFoundError： 控制台输出中的javax / mail / MessagingException。
2. 我尝试过包含javax.mail依赖项，但我90％肯定 因为它在GAE SDK中我不应该明确列出它。
3. 一旦服务正在运行，我会为主应用程序获得404 和管理控制台。假设这与上述有关，但是 不是100％肯定。
4. 我们之前使用辅助AppEngine实例测试“live” 部署到生产。有没有办法设置分支 推送部署所以我们不会提前合并回主人 释放？
5. 是否有理由通过Maven提供GWT 2.6.1，但没有 通过谷歌Eclipse回购？另外，GWT .properties文件在哪里用于Maven？我还有什么 需要转换吗？

对于一些看似有点基本的问题感到抱歉，但这是我与Maven的第一次跳舞，而且我在这个项目上独自飞行。 （我的PM不是贸易开发商，我的实习生也不知道Maven。）

编辑：忘了张贴pom：

<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.stripped</groupId>
  <artifactId>bogus</artifactId>
  <version>1.5.3</version>
  <packaging>war</packaging>
  <name>Stuff</name>
  <properties>
    <appengine.target.version>1.9.15</appengine.target.version>
    <gwt.target.version>2.6.1</gwt.target.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>          
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-eclipse-plugin</artifactId>
            <version>2.9</version>
            <configuration>
                <downloadSources>true</downloadSources>
                <downloadJavadocs>true</downloadJavadocs>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>gwt-maven-plugin</artifactId>
            <version>2.6.1</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>generateAsync</goal>
                        <goal>test</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <runTarget>index.html</runTarget>
            </configuration>
        </plugin>
        <plugin>
            <groupId>com.google.appengine</groupId>
            <artifactId>appengine-maven-plugin</artifactId>
            <version>${appengine.target.version}</version>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <archiveClasses>true</archiveClasses>
                <webResources>
                    <!-- in order to interpolate version from pom into appengine-web.xml -->
                    <resource>
                        <directory>${basedir}/src/main/webapp/WEB-INF</directory>
                        <filtering>true</filtering>
                        <targetPath>WEB-INF</targetPath>
                    </resource>
                </webResources>
            </configuration>
        </plugin>
    </plugins>
  </build>
  <dependencies>
    <dependency>
        <groupId>com.google.gwt</groupId>
        <artifactId>gwt-servlet</artifactId>
        <version>${gwt.target.version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.google.gwt</groupId>
        <artifactId>gwt-user</artifactId>
        <version>${gwt.target.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-api-1.0-sdk</artifactId>
        <version>${appengine.target.version}</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>com.googlecode.objectify</groupId>
        <artifactId>objectify</artifactId>
        <version>4.1.3</version>
    </dependency>
    <dependency>
        <groupId>com.googlecode.objectify</groupId>
        <artifactId>objectify-gwt</artifactId>
        <version>1.2.1</version>
    </dependency>
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>18.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava-gwt</artifactId>
        <version>18.0</version>
    </dependency>
    <dependency>
        <groupId>org.jdom</groupId>
        <artifactId>jdom2</artifactId>
        <version>2.0.5</version>
    </dependency>
    <!-- Unit Test Dependencies -->
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-testing</artifactId>
        <version>${appengine.target.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-api-stubs</artifactId>
        <version>${appengine.target.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <scope>test</scope>
        <version>4.11</version>
    </dependency>
  </dependencies>
</project>

EDIT2：

我注意到调试配置指向了     -war [AbsPath] src \ main \ webapp ...没有lib /文件夹。我改成了     -war [AbsPath] target \ bogus-3.9.6 并且不再获得NoClassDefFoundError！

但是，我现在得到了这个，这是我部署到AppEngine时获得的第一个例外。

INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Nov 21, 2014 12:10:37 AM com.google.appengine.tools.development.IsolatedAppClassLoader checkWorkingDirectory
WARNING: Your working directory, ([...]workspace\bogus\src\main\webapp) is not equal to your 
web application root ([...]workspace\bogus\target\bogus-3.9.6)
You will not be able to access files from your working directory on the production server.

Nov 21, 2014 12:10:37 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: jetty-6.1.x
Nov 21, 2014 12:10:38 AM com.google.appengine.tools.development.agent.impl.Transformer transform
SEVERE: Unable to instrument com.bogus.server.services.MailHandlerFilter. Security restrictions may not be entirely emulated.
java.lang.ArrayIndexOutOfBoundsException: 1790
    at com.google.appengine.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:181)
    at com.google.appengine.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:153)
    at com.google.appengine.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:424)
    at com.google.appengine.tools.development.agent.impl.Transformer.rewrite(Transformer.java:133)
    at com.google.appengine.tools.development.agent.impl.Transformer.transform(Transformer.java:113)
    at sun.instrument.TransformerManager.transform(Unknown Source)
    at sun.instrument.InstrumentationImpl.transform(Unknown Source)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:216)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.mortbay.util.Loader.loadClass(Loader.java:91)
    at org.mortbay.util.Loader.loadClass(Loader.java:71)
    at org.mortbay.jetty.servlet.Holder.doStart(Holder.java:73)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:81)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:662)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:255)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:288)
    at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
    at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)
    at com.google.appengine.tools.development.Modules.startup(Modules.java:105)
    at com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:258)
    at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:213)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:211)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:211)
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:522)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1104)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:844)
    at com.google.gwt.dev.DevMode.main(DevMode.java:322)

Nov 21, 2014 12:10:38 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed MailHandlerFilter: java.lang.ClassFormatError: Incompatible magic value 4022320623 in class file com/bogus/server/services/MailHandlerFilter
Nov 21, 2014 12:10:38 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed com.google.appengine.tools.development.DevAppEngineWebAppContext@77fcc757{/,[...]workspace\uswr_gwt\target\uswr_gwt-3.9.6}: java.lang.ClassFormatError: Incompatible magic value 4022320623 in class file com/bogus/server/services/MailHandlerFilter
Nov 21, 2014 12:10:38 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed JettyContainerService$ApiProxyHandler@7403695c: java.lang.ClassFormatError: Incompatible magic value 4022320623 in class file com/bogus/server/services/EcontrollerMailHandlerFilter
Nov 21, 2014 12:10:38 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: Error starting handlers
java.lang.ClassFormatError: Incompatible magic value 4022320623 in class file com/bogus/server/services/EcontrollerMailHandlerFilter
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:216)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.mortbay.util.Loader.loadClass(Loader.java:91)
    at org.mortbay.util.Loader.loadClass(Loader.java:71)
    at org.mortbay.jetty.servlet.Holder.doStart(Holder.java:73)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:81)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:662)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:255)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:288)
    at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
    at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)
    at com.google.appengine.tools.development.Modules.startup(Modules.java:105)
    at com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:258)
    at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:213)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:211)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:211)
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:522)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1104)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:844)
    at com.google.gwt.dev.DevMode.main(DevMode.java:322)