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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"><a href="https://shibboleth.atlassian.net/browse/JPAR?atlOrigin=eyJpIjoiZWYxOGMzNmVlN2YwNDc0OGI0OTJjOTk1MDEwMWUxODEiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Java Parent Project</a> / <a href="https://shibboleth.atlassian.net/browse/JPAR-218?atlOrigin=eyJpIjoiZWYxOGMzNmVlN2YwNDc0OGI0OTJjOTk1MDEwMWUxODEiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-fdd501f8-b7b8-4dc1-bcca-e42ff4ad8936" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://shibboleth.atlassian.net/browse/JPAR-218?atlOrigin=eyJpIjoiZWYxOGMzNmVlN2YwNDc0OGI0OTJjOTk1MDEwMWUxODEiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">JPAR-218</a></td>
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<td style="vertical-align: top;; padding: 0; 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://shibboleth.atlassian.net/browse/JPAR-218?atlOrigin=eyJpIjoiZWYxOGMzNmVlN2YwNDc0OGI0OTJjOTk1MDEwMWUxODEiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Compile everything with the javac -parameters option</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">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><img src="cid:jira-generated-image-avatar-fdd501f8-b7b8-4dc1-bcca-e42ff4ad8936" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug</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">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">11.3.5</td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">Unassigned</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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">01/Feb/23 12:48 PM</td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><img src="cid:jira-generated-image-static-trivial-e5336bdd-f914-4f1f-9431-6d67fb1036d0" height="16" width="16" border="0" align="absmiddle" alt="Trivial" style="vertical-align: text-bottom"> Trivial</td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><a class="user-hover" rel="557058:e127cb03-43ed-473d-b6ba-592949cb4be8" style="color:#3b73af;; color: #3b73af; text-decoration: none" id="email_557058:e127cb03-43ed-473d-b6ba-592949cb4be8" href="https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ae127cb03-43ed-473d-b6ba-592949cb4be8"> Ian Young </a></td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">From Spring Framework 6.0.2 (I think) I started seeing things like this:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap"> [java] WARN - Using deprecated '-debug' fallback for parameter name resolution.
Compile the affected code with '-parameters' instead or avoid its introspection:
net.shibboleth.shared.spring.httpclient.resource.HTTPResource</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We’ve gone round the houses with Spring and constructor parameters before, resulting in <a href="https://shibboleth.atlassian.net/browse/IDP-1047" title="smart-link" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://shibboleth.atlassian.net/browse/IDP-1047</a> and a <tt>@ParameterName</tt> annotation that is, in fact, part of the constructor for the particular named class. So, it’s at least possible that I wouldn’t have seen this warning if my MDA configuration included the <tt>ParameterNameDiscoverer</tt> bean we wrote to process it.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">More interestingly, though, a lot of people did start seeing similar warnings from Spring around the same time, even when there were no parameter names to be introspected; that turned out to be a bug which I believe was fixed in 6.0.3.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, in the <a href="https://github.com/spring-projects/spring-framework/issues/29612" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">associated ticket</a>, Juergen said this in passing:</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">We intend to remove debug symbol introspection completely in 6.1, exclusively relying on <tt>-parameters</tt>. That's the main reason for that warn logging. Aside from missing <tt>-parameters</tt>, we also found quite a few places where parameter names were introspected but effectively not used - which is quite costly since we are unnecessarily parsing the class file for every affected class there. We'd like to identify and fix all such remaining cases.</p>
</blockquote> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I think this is worth thinking about whether this might affect us: I don’t think I know whether we can say for sure that we have used <tt>@ParameterName</tt> everywhere we’d need to have in order to dodge the consequences of this.</p>
<ul>
<li>Should we start just using <tt>-parameters</tt> when compiling everything? (there’s a Maven compiler plugin option for that)</li>
<li>If Spring changes its approach, is it worth our rethinking whether <tt>@ParameterName</tt> and the associated bean is even needed any more?</li>
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