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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.jboss.org/browse/WELD" style="color: #3b73af; text-decoration: none">Weld</a> / <a href="https://issues.jboss.org/browse/WELD-1774" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-2ab16228-b5bf-4321-b2bc-e17e051c060c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://issues.jboss.org/browse/WELD-1774" style="color: #3b73af; text-decoration: none">WELD-1774</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.jboss.org/browse/WELD-1774" style="color: #3b73af; text-decoration: none">"Conversation already active" problem on tomcat when asynchronous processing</a> </span>
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Issue Type:
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Affects Versions:
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2.2.4.Final
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Unassigned
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Components:
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Conversations
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Created:
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21/Oct/14 3:38 PM
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Environment:
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Tomcat 7.0.56, servlet API 3.0, Spring MVC
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="davido_53" id="email_davido_53" href="https://issues.jboss.org/secure/ViewProfile.jspa?name=davido_53" style="color:#3b73af;; color: #3b73af; text-decoration: none">Ondřej David</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem resides inside the standard tomcat valve which processes every incoming request. At the very beginning the valve evaluates whether the request is already considered as asynchronous or not. In the latter case the init event is fired which activates the weld context:</p>
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<b>org.apache.catalina.core.StandardHostValve.java</b>
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<span class="code-keyword" style="color: #000091">if</span> (asyncAtStart || context.fireRequestInitEvent(request)) {
...
}
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The <b>if</b> block also contains the execution of the business code which switches the request to the async mode. The following valve code checks the request mode after its procession is finished. In case it has become asynchronous, no destroy event is dispatched which unfortunately keeps the weld context initialized within the running thread:</p>
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<b>org.apache.catalina.core.StandardHostValve.java</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">if</span> (!(request.isAsync() || (asyncAtStart &&
request.getAttribute(
RequestDispatcher.ERROR_EXCEPTION) != <span class="code-keyword" style="color: #000091">null</span>))) {
<span class="code-comment" style="color: #808080">// Protect against NPEs <span class="code-keyword" style="color: #000091; color: #808080">if</span> context was destroyed during a
</span> <span class="code-comment" style="color: #808080">// <span class="code-object" style="color: #910091; color: #808080">long</span> running request.
</span> <span class="code-keyword" style="color: #000091">if</span> (context.getState().isAvailable()) {
...
context.fireRequestDestroyEvent(request);
}
}
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Once the same thread is chosen to serve a request, the "Conversation already active" exception is thrown. Is there any workaround for this? Unfortunately this problem makes it impossible to use the jsf 2.2 on tomcat when using the asynchronous tasks. It's definitely possible to change the weld code to the behaviour that in case the context is already active, it is at first deactivated and subsequentially activated, but it is an awful hack.</p>
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