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我試圖讓Vaadin7應用程序在Google應用程序引擎上工作。我用eclipse juno使用app-engine sdk 1.8.5。部署到谷歌應用程序引擎的內部錯誤
部署似乎工作,因爲我得到:
------------ 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,在操作結束時有一個彈出說:
An internal error occurred during: "Deploying <app-name> to Google".
java.lang.NullPointerException
沒有被寫入日誌文件,我沒有線索什麼樣的空指針是。從網絡瀏覽器訪問應用程序給HTTP 500. 任何提示可能是什麼原因/可能的解決方案?