是否可以将Java Servlet部署到GAE？ [英] Is it possible to deploy a Java Servlet to GAE?

问题描述

是否可以将Java Servlet部署到GAE，还是需要将服务器托管在别处？ 回答：是

稍微长一点的答案： > App Engine使用Jetty servlet容器托管应用程序并支持Java Servlet API 2.4版。请记住，虽然有相当多的限制，你必须尊重（来源）：

• App Engine运行Java 6版本，但不提供所有Java类，例如Swing和大多数AWT类不支持。
  
• 您不能使用使用线程的线程或框架。


• 您可能无法写入文件系统。


• 您只能读取属于您的应用程序的文件。


• 某些java.lang.System操作，例如gc（）或exit（）不会执行任何操作。
  
• 无法调用JNI代码。
  
• 反射对于您自己的类和标准Java类，但不能使用反射来访问应用程序之外的其他类。


• 一个servlet必须在30秒内回复或 com.google.apphosting.api.DeadlineExceededException


• 请参阅这里为列入白名单的Java类。

请务必阅读 The Sandbox 可以查看哪些内容和哪些内容无效的示例。

Is it possible to deploy a Java Servlet to GAE, or does the server need to be hosted elsewhere?

解决方案

Short answer: Yes

Slightly longer answer:

App Engine uses the Jetty servlet container to host applications and supports the Java Servlet API version 2.4. Keep in mind though that there are quite a few restrictions in place that you have to respect (source):

• App Engine runs a version of Java 6 but does not provide all Java classes, for example Swing and most AWT classes are not supported.
• You cannot use Threads or frameworks which use Threads.
• You may not write to the filesystem.
• You may only read files which are part of your application.
• Certain "java.lang.System" actions, e.g. gc() or exit() will do nothing.
• You can not call JNI code.
• Reflection is possible for your own classes and standard Java classes, but your cannot use reflection to access other classes outside your application.
• A servlet must reply within 30 seconds or a com.google.apphosting.api.DeadlineExceededException is thrown.
• See here for the Java classes that are white-listed.

Be sure to also read up on The Sandbox to see examples of what will and will not work.

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