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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Using the <tt>jsplitpkgscan</tt> application, I note that the remaining files still conflict, it's just that whatever we're doing in the build isn't noticing any more. Specifically:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
javax.activation
27 file:/activation-1.1.1.jar
31 file:/jakarta.activation-api-1.2.1.jar
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</div> <p style="margin: 10px 0 0 0">There are several other examples, which I'll cover in detail in <a href="https://issues.shibboleth.net/jira/browse/IDP-1465" title="deep review of dependencies for v4" class="issue-link" data-issue-key="IDP-1465" style="color: #3b73af; text-decoration: none">IDP-1465</a>.</p> <p style="margin: 10px 0 0 0">It's clear that this is one example of a general pattern, where:</p>
<ul>
<li>Originally, there was a single artifact called (in this case) <tt>javax.activation:activation</tt>, containing both the API and the implementation.</li>
<li>The API and implementation are not separable here. They each depend on the other. They can't, therefore, be split into two artifacts.</li>
<li>To provide encapsulation pre-module system, <em>current</em> artifacts are:
<ul>
<li><tt>com.sun.activation:jakarta.activation</tt> is the implementation artifact, containing both API and implementation packages as before. The intention is that this is used at runtime.</li>
<li><tt>javax.activation:javax.activation-api</tt> contains <em>just</em> the API classes (perhaps a different expression of the API that doesn't depend on the implementation, I don't know). The intention is that this is used at compile time and <em>never</em> included at runtime.</li>
</ul> </li>
</ul> <p style="margin: 10px 0 0 0">This pattern seems to be repeated for Activation, Mail and JAXB in particular, but probably other modules as well.</p> <p style="margin: 10px 0 0 0">We need to:</p>
<ul>
<li>Stop managing the original artifact in the parent POM</li>
<li>Exclude any references to the API artifacts from modules having them as compile-time dependencies (unless they have been managed to "optional"</li>
<li>Ensure that the <em>implementation</em> artifacts are included at runtime</li>
<li>Enforce that the <em>API-only</em> artifacts are <em>not</em> included at runtime</li>
<li>Run <tt>jpkgsplitscan</tt> on products to make sure they don't have split packages because of this setup: they might not work at runtime, depending on which of the two implementations of the API packages "wins", which I don't think is guaranteed.</li>
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