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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-2416" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-64c0bad0-ec36-45a3-b3b1-5718b514d4e6" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://issues.jboss.org/browse/WELD-2416" style="color: #3b73af; text-decoration: none">WELD-2416</a> </td>
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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-2416" style="color: #3b73af; text-decoration: none">Memory behaviour of of javax.enterprise.inject.Instance<?>.iterator().next vs. of javax.enterprise.inject.Instance<?>.get() in Weld 1.1.18 vs. Weld 2.3.5</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Change By:</th>
<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="brunnert" id="email_brunnert" href="https://issues.jboss.org/secure/ViewProfile.jspa?name=brunnert" style="color:#3b73af;; color: #3b73af; text-decoration: none">Andreas Brunnert</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">In a recent performance test we have noticed a memory leak while using CDI Instance injections on WebLogic 12.1.3 (packaging Weld 1.1.18) and noticed some memory-relevant behaviour differences when comparing it to a more recent Weld version 2.3.5 packaged in Wildfly 10.1. The basic question comes down to wether javax.enterprise.inject.Instance<?>.iterator().next() should behave differently to javax.enterprise.inject.Instance<?>.get() as it did in Weld 1.1.18 or more similarly as they do in Weld 2.3.5?<br><br>Here are some more details:<br><br>The simplest setup we could boil this issue down to is the following web application (also attached as maven project TestCDIInjection.zip):<br><br>{code:java}<br>@WebServlet("/Servlet")<br>public class Servlet extends HttpServlet {<br> private static final long serialVersionUID = 1L;<br><br> @Inject<br> private Instance<CDIInterface> cdi;<br> /**<br> * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)<br> */<br> protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {<br> response.getWriter().write("Here " + Servlet.class.getName() + " - " + cdi.get().sayHello());<br> }<br><br>}<br><br>public interface CDIInterface {<br><br> public abstract String sayHello();<br>}<br><br>@Default<br>public class CDIBean implements CDIInterface{<br><br> @Inject<br> private Instance<CDIBean2> bean2;<br> <br> public String sayHello() {<br> return "Here " + CDIBean.class.getName() + " - " + bean2.get().testHello();<br> }<br><br>}<br><br>public class CDIBean2 {<br><br> public String testHello() {<br> return "Here " + CDIBean2.class.getName();<br> }<br>}<br>{code}<br><br>In this web application the amount of CDIBean instances keeps growing for each Servlet invocation, however, {color:red}this is not happening if the CDIBean would not reference the CDIBean2 in Weld 1.1.18 on Weblogic 12.1.3{color}. Here you can see the resut of 8 Servlet invocations:<br><br> !image-2017-08-18-14-39-46-341.png|thumbnail! <br><br>After some investigations and looking at similar tickets (such as this one: https://issues.jboss.org/browse/WELD-1478) and blog articles (https://blog.akquinet.de/2017/01/04/dont-get-trapped-into-a-memory-leak-using-cdi-instance-injection/) we came up with a slightly different work around which is to use javax.enterprise.inject.Instance<?>.iterator().next() instead of javax.enterprise.inject.Instance<?>.get() in order to retreive the CDI instance we are interested in. <br><br>If you just change the get() calls to iterator().next() in the code snippets above the instances will be garbage collected, e.g.:<br><br>{code:java}<br> response.getWriter().write("Here</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> test CDI:</span> <span class="diffcontext"> " +</span> <span class="diffaddedchars" style="background-color:#ddfade;"> Servlet.class.getName() + " - " +</span> <span class="diffcontext"> cdi.iterator().next().sayHello());<br>{code}<br><br>You can call the servlet as often as you want and you will only see the Servlet instance in memory as expected.<br><br>In order to ensure hat this solution makes any sense, we have also tried it on a newer Weld version (2.3.5) with WildFly 10.1 and noticed that the behaviour does not differ anymore between the get() and iterator().next() calls. <br><br>So what behaviour is the expected one? One major change we have noticed in the InstanceImpl.iterator() implementation between the two versions we have tested (1.1.18 and 2.3.5) is the following commit:<br><br>https://github.com/weld/core/commit/4f5eb3b95ebb815d3fbf0a1cb67ebbb11700af43#diff-e5101dc08bd36449a7b95c85e482075e<br><br>to fix:<br><br>https://issues.jboss.org/browse/WELD-1320<br><br>However, with the changed iterator() behaviour, we are running in a memory leak with both solutions. Is there any chance for a fix for WELD-1320 that still leads to the old memory behaviour behaviour of InstanceImpl.iterator()?</span> </td>
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