java - 在本地开发服务器中运行 AppEngine 应用程序

Question

我正在按照本教程构建 AppEngine 程序:https://developers.google.com/appengine/docs/java/gettingstarted/setup在 mac os x 64 位上使用终端

我无法让“留言簿”应用程序在本地开发服务器上运行。当我运行该程序并尝试在网络浏览器中打开它时，它崩溃了，有人能帮我解决这个问题吗？

我相信由于此验证错误:

  [INFO] Caused by: com.google.apphosting.utils.config.AppEngineConfigException: XML errorvalidating /Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT/META-INF/appengine-application.xml against /Users/jamesjohnson/.m2/repository/com/google/appengine/appengine-java-sdk/1.9.8/appengine-java-sdk/appengine-java-sdk-1.9.8/docs/appengine-application.xsd

根据教程的说明，我将构建环境设置为以下内容:

3.1.1安装并由M2_HOME变量指向，运行 java 7 并使 JAVA_HOME 变量指向正确的 jdk，并且M2 变量设置为 M2_HOME/bin

我已完全按照说明创建并配置了该项目。

当我构建应用程序时，我收到一条构建成功消息:

然后，当我尝试通过调用此命令在本地计算机上的开发服务器中运行应用程序时:

mvn appengine:devserver

服务器开始运行:

[INFO] <<< appengine-maven-plugin:1.9.8:devserver (default-cli) @ guestbook-ear <<<
[INFO] 
[INFO] --- appengine-maven-plugin:1.9.8:devserver (default-cli) @ guestbook-ear ---
[INFO] 
[INFO] Google App Engine Java SDK - Running Development Server
[INFO] 

然后我收到一条错误消息:

[INFO] com.google.apphosting.utils.config.AppEngineConfigException: Invalid configuration 

接下来是大约 30 行，描述所有失败的类。最后我仍然收到一条“构建成功”消息:

 ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.180s
[INFO] Finished at: Thu Aug 07 16:44:35 MDT 2014
[INFO] Final Memory: 11M/183M
[INFO] ------------------------------------------------------------------------

我将在下面发布完整的错误跟踪:

Jamess-MacBook-Pro-2:guestbook-ear jamesjohnson$ mvn appengine:devserver

    [INFO] Scanning for projects...
    [INFO]                                                                         
    [INFO] ------------------------------------------------------------------------
    [INFO] Building guestbook-ear 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO] 
    [INFO] >>> appengine-maven-plugin:1.9.8:devserver (default-cli) @ guestbook-ear >>>
    [INFO] 
    [INFO] --- maven-ear-plugin:2.8:generate-application-xml (default-generate-application-xml) @      guestbook-ear ---
    [INFO] Generating application.xml
    [INFO] 
    [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ guestbook-ear ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] skip non existing resourceDirectory /Users/jamesjohnson/guestbook/guestbook- ear/src/main/resources
    [INFO] 
    [INFO] --- maven-ear-plugin:2.8:ear (default-ear) @ guestbook-ear ---
    [INFO] Copying artifact [war:com.google.appengine.demos:guestbook-war:1.0-SNAPSHOT] to [guestbook-war-1.0-SNAPSHOT.war] (unpacked)
    [INFO] Copy ear sources to /Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT
    [INFO] Including custom manifest file [/Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT/META-INF/MANIFEST.MF]
    [INFO] Building jar: /Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT.ear
    [INFO] 
    [INFO] <<< appengine-maven-plugin:1.9.8:devserver (default-cli) @ guestbook-ear <<<
    [INFO] 
    [INFO] --- appengine-maven-plugin:1.9.8:devserver (default-cli) @ guestbook-ear ---
    [INFO] 
    [INFO] Google App Engine Java SDK - Running Development Server
    [INFO] 
    [INFO] Retrieving Google App Engine Java SDK from Maven
    [INFO] Running /Library/Java/JavaVirtualMachines/jdk1.7.0_67.jdk/Contents/Home/jre/bin/java -XstartOnFirstThread -D--enable_all_permissions=true -Xbootclasspath/p:/Users/jamesjohnson/.m2/repository/com/google/appengine/appengine-java-sdk/1.9.8/appengine-java-sdk/appengine-java-sdk-1.9.8/lib/override/appengine-dev-jdk-overrides.jar -Dappengine.fullscan.seconds=5 -classpath /Users/jamesjohnson/.m2/repository/com/google/appengine/appengine-java-sdk/1.9.8/appengine-java-sdk/appengine-java-sdk-1.9.8/lib/appengine-tools-api.jar com.google.appengine.tools.development.DevAppServerMain --allow_remote_shutdown --no_java_agent /Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT
    [INFO] com.google.apphosting.utils.config.AppEngineConfigException: Invalid configuration

    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl.reportDeferredConfigurationException(DevAppServerImpl.java:474)

    [INFO]  at     com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:226)
    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)

    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:213)
    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:211)
    [INFO]  at java.security.AccessController.doPrivileged(Native Method)

    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:211)
    [INFO]  at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:277)
    [INFO]  at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
    [INFO]  at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:219)

    [INFO]  at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:210)          

    [INFO] Caused by: com.google.apphosting.utils.config.AppEngineConfigException: XML error validating /Users/jamesjohnson/guestbook/guestbook-ear/target/guestbook-ear-1.0-SNAPSHOT/META-INF/appengine-application.xml against /Users/jamesjohnson/.m2/repository/com/google/appengine/appengine-java-sdk/1.9.8/appengine-java-sdk/appengine-java-sdk-1.9.8/docs/appengine-application.xsd

    [INFO]  at com.google.apphosting.utils.config.EarHelper.validateXml(EarHelper.java:253)
    [INFO]  at com.google.apphosting.utils.config.EarHelper.readEarInfo(EarHelper.java:108)
    [INFO]  at com.google.appengine.tools.development.ApplicationConfigurationManager.readEarConfiguration(ApplicationConfigurationManager.java:203)
    [INFO]  at com.google.appengine.tools.development.ApplicationConfigurationManager.<init> (ApplicationConfigurationManager.java:150)

    [INFO]  at com.google.appengine.tools.development.ApplicationConfigurationManager.newEarConfigurationManager(ApplicationConfigurationManager.java:66)
    [INFO]  at com.google.appengine.tools.development.ApplicationConfigurationManager.newEarConfigurationManager(ApplicationConfigurationManager.java:53)
    [INFO]  at com.google.appengine.tools.development.DevAppServerImpl.<init>(DevAppServerImpl.java:132)
    [INFO]  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    [INFO]  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    [INFO]  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    [INFO]  at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    [INFO]  at com.google.appengine.tools.development.DevAppServerFactory.doCreateDevAppServer(DevAppServerFactory.java:258)
    [INFO]  at com.google.appengine.tools.development.DevAppServerFactory.access$000(DevAppServerFactory.java:36)
    [INFO]  at com.google.appengine.tools.development.DevAppServerFactory$1.run(DevAppServerFactory.java:226)
    [INFO]  at com.google.appengine.tools.development.DevAppServerFactory$1.run(DevAppServerFactory.java:224)

    [INFO]  at java.security.AccessController.doPrivileged(Native Method)
    [INFO]  at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:224)
   [INFO]   at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:94)
    [INFO]  at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:265)
   [INFO]   ... 3 more
   [INFO] Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
   [INFO]   at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
   [INFO]   at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
   [INFO]   at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441)
   [INFO]   at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
   [INFO]   at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1436)
   [INFO]   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:999)
   [INFO]   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
    [INFO]  at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)
    [INFO]  at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
    [INFO]  at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
    [INFO]  at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
    [INFO]  at c   om.sun.org.apache.xerces.internal.jaxp.validation.StreamValidatorHelper.validate(StreamValidatorHelper.java:155)
    [INFO]  at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:116)
    [INFO]  at javax.xml.validation.Validator.validate(Validator.java:124)
    [INFO]  at com.google.apphosting.utils.config.EarHelper.validateXml(EarHelper.java:250)
    [INFO]  ... 21 more
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESS
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 3.180s
    [INFO] Finished at: Thu Aug 07 16:44:35 MDT 2014
    [INFO] Final Memory: 11M/183M

Answer 1

您的 appengine-application.xml 文件中存在错误。您在问题中列出的代码和跟踪与此问题无关。