嵌入式码头-IllegalStateException：没有SessionManager [英] Embedded Jetty - IllegalStateException: No SessionManager

问题描述

我在Google上找到了很多有关此问题的参考，但没有找到答案。我正在使用最新版本的jetty（8.1.2.v20120308），但似乎无法获得嵌入式servlet来使用会话。该示例当然在scala中，但是任何Java程序员都应该可以阅读。

I've found plenty of references to this issue on google but no answers. I'm using the latest version of jetty (8.1.2.v20120308) and I can't seem to get an embedded servlet to be able to use sessions. The example is in scala of course, but it should be readable to any java programmer.

val server = new Server();
val connector = new SelectChannelConnector()
connector.setPort(Integer.getInteger("jetty.port", 8080).intValue())
server.setConnectors(Array(connector))

val webapp = new ServletContextHandler(ServletContextHandler.SESSIONS)
webapp.setContextPath("/")
webapp.setResourceBase(webDir)
webapp.setServer(server)

val brzyServ = new ServletHolder(new BrzyDynamicServlet())
webapp.addServlet(brzyServ, "*.brzy")

server.setHandler(webapp);
server.start()

在我的servlet代码中：

in my servlet code:

...
log.debug("session manager: {}",req.asInstanceOf[Request].getSessionManager)
val session = req.getSession
...

req.getSession抛出此异常，并且之前的调试行始终为null。

The req.getSession throws this exception, and the debug line before it, is always null.

java.lang.IllegalStateException: No SessionManager
at org.eclipse.jetty.server.Request.getSession(Request.java:1173)

在日志中，我可以看到：

In the log I can see this:

DEBUG org.eclipse.jetty.server.session - sessionManager=org.eclipse.jetty.server.session.HashSessionManager@2a8ceeea
DEBUG org.eclipse.jetty.server.session - session=null

我不确定这是否相关，但是似乎有一个会话管理器，但在请求中不可用。

I'm not sure if that's relevant, but it would appear that there is a session manager but it's not available on the request.

我已经使用WebAppContext尝试了相同的结果。更不用说以多种方式显式设置sessionManager了。

I've tried this with the WebAppContext with the same result. Not to mention explicitly setting the sessionManager in a dozen different ways.

推荐答案

我认为问题出在您实例化 ServletContextHandler 而不是 WebappContext

I believe the issue comes from the fact that you are instantiating a ServletContextHandler rather than a WebappContext

尝试

val webapp = new WebappContext();

或

val webapp = new ServletContextHandler(ServletContextHandler.SESSIONS)
webapp.setSessionHandler(new SessionHandler())

来自ServletContextHandler javadoc

From the ServletContextHandler javadoc

 [...]construction of a context with ServletHandler and optionally session and security handlers [...]

单词可选可能是这里的关键。

The word optionally is likely the key here.

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