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https://issues.apache.org/jira/browse/OWB-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537090#comment-14537090
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Mark Struberg commented on OWB-1070:
------------------------------------
It is a real issue but one does hardly hit it. And no, it's not TomEE related
but affects OWB on pure Tomcat as well.
> eager session creation configuration
> ------------------------------------
>
> Key: OWB-1070
> URL: https://issues.apache.org/jira/browse/OWB-1070
> Project: OpenWebBeans
> Issue Type: New Feature
> Components: Context and Scopes
> Affects Versions: 1.5.0
> Reporter: Mark Struberg
> Assignee: Mark Struberg
> Fix For: 1.6.0
>
>
> In OWB we try to not create any HttpSession if we do not need it. The reason
> is that we do not like to pollute the Session for e.g. resource or JAXRS
> requests. That would just blow up the memory.
> Instead we create the Session lazily. See
> {{WebContextsService#lazyStartSessionContext(boolean createSession)}}.
> The ConversationContext and thus the Session gets started whenever you use a
> @SessionScoped or @ConversationScoped bean the first time and there was no
> Session yet.
> If that is the case AFTER there was some HttpServletResponse written back to
> the client. then you will get the following Exception:
> {quote}
> IllegalStateException: Cannot create a session after the response has been
> committed.
> {quote}
> We might prevent this by starting the Session for every request. But this has
> quite a few downsides, including slowing down any request and polluting
> memory with useless Sessions.
> A possible solution would be to introduce an {{eagerSessionInitialisation}}
> config entry via openwebbeans.properties. It could have 3 options
> * {{true}} will create a Session on each request start
> * {{false}} (should be default) will use lazySessionInit as always
> * a custom String which is a regexp for requests which need an eagerly
> initialized Session. All other requests will use lazySessionInit.
> Any comment and further ideas are welcome.
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