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<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0 0">Does it really come down to "some environments need the present TCCL passed as the parent of the TCCL we swap in, whereas others need null"?</p>
</blockquote>
<p style="margin: 10px 0 0 0">Not sure but that sounds like a way to deal with the possibility if yes. </p>
<p style="margin: 10px 0 0 0">I'm wondering if tccl, has the same application classloaders as this.aggregatedClassLoader has, which could be introducing the situation where different definitions of the application classes are loaded (some by TcclSafeAggregatedClassLoader and some by the TcclSafeAggregatedClassLoader.super). It might be useful to know what the actual differing classloaders are, when the ClassCastException occurs.</p>
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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">public</span> <T> T withTccl(Work<T> work) {
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">ClassLoader</span> tccl = <span class="code-object" style="color: #910091">Thread</span>.currentThread().getContextClassLoader();
<span class="code-object" style="color: #910091">boolean</span> set = <span class="code-keyword" style="color: #000091">false</span>;
<span class="code-keyword" style="color: #000091">try</span> {
<span class="code-object" style="color: #910091">Thread</span>.currentThread().setContextClassLoader(
<span class="code-keyword" style="color: #000091">new</span> TcclSafeAggregatedClassLoader( aggregatedClassLoader, tccl ) );
set = <span class="code-keyword" style="color: #000091">true</span>;
}
<span class="code-keyword" style="color: #000091">catch</span> (Exception ignore) {
}
<span class="code-keyword" style="color: #000091">try</span> {
<span class="code-keyword" style="color: #000091">return</span> work.perform();
}
<span class="code-keyword" style="color: #000091">finally</span> {
<span class="code-keyword" style="color: #000091">if</span> ( set ) {
<span class="code-object" style="color: #910091">Thread</span>.currentThread().setContextClassLoader( tccl );
}
}
}
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