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<p style="margin: 10px 0 0 0">First off, OpenSAML v2 is nearing its End-Of-Life, and we just last week released the final non-security patch release prior to the full EOL on July 31, 2016. So there will be no more non-security releases of the v2 library. Projects should switch to the v3 library. v3 doesn't have this issue since we completely eliminated the <tt>Observer</tt>/<tt>Observable</tt> pattern.</p>
<p style="margin: 10px 0 0 0">Second, I think I see the leak you mention, and nominally agree, but: In actual practice this really shouldn't come up. One typically does not add or re-add the same metadata provider to the chaining provider multiple times. Certainly one does not re-add the metadata provider(s) "each time IdP metadata is uploaded or SP keys are changed". Most of the concrete metadata provider impls reload themselves, so you don't create new instances when the data changes. Specifically you only call the chaining provider's <tt>setProviders</tt> or <tt>addMetadataProvider</tt> once, at app start up time (or config reload time, see below) - not because the data underlying the metadata provider(s) changes.</p>
<p style="margin: 10px 0 0 0">If you <b>did</b> have some reloading environment where you say re-read all your config and created new <tt>MetadataProvider</tt> instances (the Shibboleth IdP does this, for example), you would then also want to create a new <tt>ChainingMetadataProvider</tt> also, not reuse the same one.</p>
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