Re: [jetty-users] Fwd: Need Help with Embedded Jetty - Adding multiple c

[Jan Bartel <janb@xxxxxxxxxxx>]

Varsha,

Just to emphasize - I think you want a ContextHandlerCollection, not a HandlerList - a HandlerList tries each handler (or context in your case) in order, whereas a ContextHandlerCollection picks the best matching context from the path of the request. It would be most unusual to have a HandlerList of contexts. So fix this first before changing your multithreaded approach.

Jan

On 12 April 2016 at 19:52, Varsha Gopal <varshapillai@xxxxxxxxx> wrote:

Thanks Jan. Much appreciated!

I'll try to clarify the flow a bit more.

My main thread creates and starts the Jetty Server - as attached in Jetty_Server.txt

Once Server is started, it spawns x number of threads depending on the number of contexts I have to deploy in the server [ whats attached in Jetty_Context.txt , which basically is creating instances of org.eclipse.jetty.webapp.WebAppContext and attaching to HandlerCollection of the Server. ] What we are trying to achieve is an hot deploy of sorts in to HandlerCollection. And if I understand correctly, HandlerCollection is mutable which would allow hot deploy.

Now, as you mentioned, if it's allowed only in Single thread, then Yes, I would have a problem. Where can I find a confirmation to this without burning my fingers, you think? 

Just FYI , I have tried out the single thread, multiple context approach and that works. No handlerCollection here, just keeping on adding WebAppContext to HandlerList. 

I will try out your suggestion of adding HandlerCollection to HandlerList rather than the other way around.

Thanks,

Varsha

On Tue, Apr 12, 2016 at 2:16 PM, Jan Bartel <janb@xxxxxxxxxxx> wrote:

Varsha,

I'm not sure how those two code snippets you attached relate to each other, but some observations:

 * A HandlerList is not the same thing as a ContextHandlerCollection. Normally, if you're creating multiple contexts you would add them to a ContextHandlerCollection (which itself is added to a HandlerList). The ContextHandler collection has significant behavioural differences to a HandlerList. Have a read of http://www.eclipse.org/jetty/documentation/current/architecture.html for some pointers on that.

* I don't think that simultaneous deployment of webapps is particularly supported - usually the deployment process is single threaded so it's possible you might hit some funky behaviour.

cheers

Jan

On 11 April 2016 at 14:47, Varsha Gopal <varshapillai@xxxxxxxxx> wrote:

Any pointers for the below query?

---------- Forwarded message ----------
From: Varsha Gopal <varshapillai@xxxxxxxxx>
Date: Thu, Apr 7, 2016 at 11:47 AM
Subject: Need Help with Embedded Jetty - Adding multiple context through Mutable Handle Collection
To: jetty-users@xxxxxxxxxxx

Is it right to start a jetty instance with no context specified and no context handler, then keep adding context to it once the server has started. Although I was able to do this using mutable HandlerCollection and the logs says the Server and the Contexts are Started and Available, I am not able to access it with a URL with the context [ Not Found error / 404]. 

Should we add at least one root context and contexthandler to the server while starting it?

My main thread starts the server. Post that it will spawn couple of threads which each creates WebAppContext and start them. 

My jetty version is 9.3.7.v20160115

Bit of the code where I am starting the server and contexts are attached, along with few inline comments

P.S If I start Server and context in one go without any handlercollection, i.e each context in its own server instance and finally just start the server, it's working. I am able to access it with the contextpath for the same jars in the classpath.

Thanks in advance,

Varsha

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Jan Bartel <janb@xxxxxxxxxxx>

www.webtide.com
Expert assistance from the creators of Jetty and CometD

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Jan Bartel <janb@xxxxxxxxxxx>

www.webtide.com
Expert assistance from the creators of Jetty and CometD