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POEclipse/IVY error indirectly referenced from required .class files
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copied!<p>I am periodically experiencing the <code>"type [blah] cannot be resolved. It is indirectly referenced from required .class files"</code> error, and reaching out for help.</p> <p>I've searched this site and the web, and all of <a href="https://stackoverflow.com/questions/5547162/eclipse-error-indirectly-referenced-from-required-class-files">the</a> <a href="https://stackoverflow.com/questions/7476092/error-in-eclipse-about-type-indirectly-referenced-from-required-class-file">many</a> <a href="https://stackoverflow.com/questions/3464592/getting-the-following-build-error-the-type-cannot-be-resolved-it-is-ind">similar</a>-<a href="https://stackoverflow.com/questions/115971/indirectly-referenced-from-required-class-file">sounding</a> <a href="https://stackoverflow.com/questions/5715033/java-lang-object-can-not-be-resolved-it-is-indirectly-referenced-from-required">questions</a> seem to be resolved by adding classes to the classpath. But in this case, I'm pretty sure they already are on the classpath. </p> <p>Here's the situation, pared down from an extremely large metaproject. There are two eclipse projects ProjectOne and ProjectTwo. </p> <p>Both projects are published by a build server to an Ivy repository, and ProjectTwo's ivy.xml refers to that version of ProjectOne. However, I keep the ivy "resolve dependencies in workspace" preference turned on, so that I can work in both projects, and resolve to my modified classes instead of the published ones.</p> <p>ProjectOne compiles in my workspace (as does ProjectTwo, except (occasionally) for the "indirectly referenced from required .class files" problem.</p> <p>The structure looks basically like this:</p> <pre><code>// ProjectOne class Enum { **// I now suspect this name is the problem** public static class EnumObjectCache { } // ProjectTwo class Bar { **// Occasionally gets error about Enum$EnumObjectcache being unresolvable** } </code></pre> <p>This is despite the facts that:</p> <ol> <li><strong>This only affects Eclipse. The real compiler handles this all with no problem</strong></li> <li>ProjectTwo's ivy.xml file does contain a transitive dependency on ProjectOne. </li> <li>ProjectOne is present in the workspace, and successfully compiles.</li> <li>I always have "resolve dependencies in workspace" turned on.</li> <li>Regardless of how things are resolved, it should work class Enum (and EnumObjectCache) have been unchanged for more than a year.</li> <li>As an experiment, I've tried directly adding ProjectOne to ProjectTwo's classpath (by defining it as a required project). No change.</li> <li>To make this more interesting, this problem doesn't happen all the time, and it only happens to a few classes in this very large codebase. Oh, and when it does happen, it's <em>always</em> on Enum$EnumObjectCache.</li> <li>It doesn't happen to every one of the developers on the team at a time.</li> <li><p>The problem, when it happens, persists over multiple 'clean' and restarts of eclipse, and IVY re-resolves. (though I wasn't doing Ivy clean-all-caches).</p> <p><strong>10. I can "fix" the problem by introducing an otherwise unneccssary import of Enum from ProjectOne</strong></p></li> </ol> <p>Note: I had not previously tried cleaning the cache, as it's painfully slow to do (remote cache is transatlantic, and it's a <em>very</em> large project): 55 minutes to clean all caches and re-resolve, then another 20 or so to rebuild. </p> <p>However, following a clean-all-cache, re-resolve, and rebuild, I still have the same problem.</p>

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