我正在尝试让 Vaadin7 应用程序在 Google 应用程序引擎上运行。我将 app-engine sdk 1.8.5 与 eclipse juno 一起使用。
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
但是在操作结束时会弹出一个提示:
An internal error occurred during: "Deploying <app-name> to Google".
java.lang.NullPointerException
没有任何内容写入日志文件,我不知道那是什么类型的空指针。从 Web 浏览器访问应用程序会给出 HTTP 500。关于什么可能是原因/可能的解决方案的任何提示?