将文件从 Google App Engine 上传到 Amazon S3 会导致异常答案

【问题标题】：Uploading file from Google App Engine to Amazon S3 results in exception将文件从 Google App Engine 上传到 Amazon S3 会导致异常
【发布时间】：2013-02-06 11:26:49
【问题描述】：

我正在开发 gwt2.4、jre7 和 GAE 1.7.3。在开发模式下我的代码工作正常，但是当我在应用引擎上上传我的应用程序时，我收到以下错误

 java.lang.ExceptionInInitializerError
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:277)
at com.wa.gwtamazon.server.UploadServiceImpl.amazonConfig(UploadServiceImpl.java:124)
at com.wa.gwtamazon.server.UploadServiceImpl.doPost(UploadServiceImpl.java:76)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:100)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)


Nested in java.lang.ExceptionInInitializerError:
java.lang.NullPointerException
at com.amazonaws.util.VersionInfoUtils.initializeUserAgent(VersionInfoUtils.java:124)
at com.amazonaws.util.VersionInfoUtils.getUserAgent(VersionInfoUtils.java:86)
at com.amazonaws.ClientConfiguration.<clinit>(ClientConfiguration.java:31)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:277)
at com.wa.gwtamazon.server.AmazonService.uploadFileToAmazone(AmazonService.java:50)
at com.wa.gwtamazon.server.AmazonService.doPost(AmazonService.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:100)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)

我也在下面的链接上找到了解决方案，但仍然没有用

(http://code.google.com/p/googleappengine/issues/detail?id=8166)

【问题讨论】：

供您参考：Google App Engine 仅支持 JDK 5 和 6。developers.google.com/appengine/docs/java/gettingstarted/…

标签： google-app-engine gwt amazon-s3

【解决方案1】：

//编辑：他将以下 XML 添加到他的 appengine-web.xml 以使其工作：

<system-properties> 
    <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/> 
    <property name="os.name" value="Linux" /> 
    <property name="os.version" value="6.1" /> 
    <property name="java.vm.name" value="Java HotSpot(TM) Client VM" /> 
    <property name="java.vm.version" value="23.5-b02" /> 
    <property name="user.language" value="en" /> 
    <property name="user.region" value="us" /> 
</system-properties>

由于 Google App Engine 的限制（无线程，...），您无法使用 Amazon Libs。但是很少有解决方案可以帮助您：

[1]http://socialappdev.com/using-amazon-s3-with-google-app-engine-02-2011

[2]https://github.com/handstandtech/s3-simple-appengine

为什么不将Google Cloud Storage 与GAE Java SDK 一起使用？ GCS API 与 S3 API 几乎相同。

【讨论】：

但是在这个link 中，他们告诉我在应用引擎 1.7.3 中解决了这个问题，但我仍然有问题，所以你知道这件事可能是我在代码或配置中的错误。谢谢为您的回应
似乎错误报告与您的问题不同。您在 VersionInfo 第 124 行收到 NullPointerException。我认为 System.getProperty 会引发 NullPointerException（os.name 或 os.version）。但是在他们的documentation 中，他们写道 System.getProperty 是允许的。尝试按照HERE 的说明自行设置属性。
你是对的，我也尝试把这个属性但是我不知道我在值字段中写了什么？？？？？？我在应用引擎上设置的值与上传不同，但它仍然给我与上述相同的错误。
在本地服务器上调试您的应用程序并查看哪个属性引发了异常。然后尝试与该属性匹配的不同字符串。我认为大多数值都是可选的（但不是全部）。如果这不起作用，请尝试记录属性（在启动时加载它们并将它们写入日志文件）。
嘿，谢谢，当我在 appengine-web.xml

【解决方案2】：

有时应用引擎没有得到 os.name,os.version,java.vm.name 等的值，所以我们必须在 appengine-web.xml 文件中手动指定

<system-properties>

<property name="os.name" value="Linux" />
<property name="os.version" value="6.1" />

<property name="java.vm.name" value="Java HotSpot(TM) Client VM" />
<property name="java.vm.version" value="23.5-b02" />

<property name="user.language" value="en" />
<property name="user.region" value="us" />

【讨论】：