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我试图让Vaadin7应用程序在Google应用程序引擎上工作。我用eclipse juno使用app-engine sdk 1.8.5。部署到谷歌应用程序引擎的内部错误
部署似乎工作,因为我得到:
------------ Deploying frontend ------------
Preparing to deploy:
Created staging directory at: '/tmp/appcfg4530509922106401908.tmp'
Scanning for jsp files.
Scanning files on local disk.
Initiating update.
Cloning 4 static files.
Cloning 8 application files.
Deploying:
Uploading 0 files.
Initializing precompilation...
Deploying new version.
Verifying availability:
Will check again in 1 seconds.
Will check again in 2 seconds.
Will check again in 4 seconds.
Will check again in 8 seconds.
Closing update: new version is ready to start serving.
Updating datastore:
Uploading index definitions.
Deployment completed successfully
然而,在操作结束时有一个弹出说:
An internal error occurred during: "Deploying <app-name> to Google".
java.lang.NullPointerException
没有被写入日志文件,我没有线索什么样的空指针是。从网络浏览器访问应用程序给HTTP 500. 任何提示可能是什么原因/可能的解决方案?