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<p style="margin: 10px 0 0 0">Ok finally was able to reproduce it, and isolate. It also required patching Hibernate ORM and swap it in a custom build of WildFly.</p>
<p style="margin: 10px 0 0 0">The TRACE log from JBoss Modules, starting from our call to </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">ClassLoaderHelper.classForName( TIKA_BRIDGE_NAME, serviceManager );</pre>
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<p style="margin: 10px 0 0 0"> and ending the log recording after the CNFE is thrown:</p>
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<pre style="margin: 10px 0 0 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-word; white-space: pre-wrap">01:29:51,942 TRACE [org.jboss.modules] Finding class org.hibernate.search.bridge.builtin.TikaBridge from Module "deployment.SongUploaderWarArchiveWithTikaIT.war:main" from Service Module Loader
01:29:51,945 TRACE [org.jboss.modules] Finding local class org.hibernate.search.bridge.builtin.TikaBridge from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,949 TRACE [org.jboss.modules] Loading class org.hibernate.search.bridge.builtin.TikaBridge locally from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,953 TRACE [org.jboss.modules] Attempting to define class org.hibernate.search.bridge.builtin.TikaBridge in Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,958 TRACE [org.jboss.modules] Defined class org.hibernate.search.bridge.builtin.TikaBridge in Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,962 TRACE [org.jboss.modules] Finding class org.hibernate.search.bridge.TikaParseContextProvider from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,965 TRACE [org.jboss.modules] Finding local class org.hibernate.search.bridge.TikaParseContextProvider from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,968 TRACE [org.jboss.modules] Loading class org.hibernate.search.bridge.TikaParseContextProvider locally from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,972 TRACE [org.jboss.modules] Attempting to define class org.hibernate.search.bridge.TikaParseContextProvider in Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,976 TRACE [org.jboss.modules] Defined class org.hibernate.search.bridge.TikaParseContextProvider in Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,986 TRACE [org.jboss.modules] Finding class org.xml.sax.ContentHandler from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,990 TRACE [org.jboss.modules] Finding class org.apache.tika.parser.Parser from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
01:29:51,993 TRACE [org.jboss.modules] Class org.apache.tika.parser.Parser not found from Module "org.hibernate.search.engine:5.3.1-SNAPSHOT" from local module loader @706a04ae (finder: local module finder @6eceb130 (roots: wildfly-9.0.0.CR3-SNAPSHOT/modules,wildfly-9.0.0.CR3-SNAPSHOT/modules/system/layers/base))
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<p style="margin: 10px 0 0 0">Our classloading strategy is able to load the extensions from the user WAR, but while the <tt>org.hibernate.search.bridge.builtin.TikaBridge</tt> class is found in the composite <tt>org.hibernate.search.cfg.impl.DelegatingClassLoaderService</tt> - which includes both our modules and the user extension points - it's then identified as found within the <tt>hibernate-search-engine</tt> module; when this happens, the Class definition is declared as "found" but bound to the <tt>hibernate-search-engine</tt> module's classloader, and no longer to the composite classloader.<br /> In a second step, the class definition needs to be initialized within its associated classloader (the <tt>hibernate-search-engine</tt> module), but dependencies to <tt>org.apache.tika.parser.Parser</tt> and similar (imported by TikaBridge) have it fail.</p>
<p style="margin: 10px 0 0 0">Looks like a possible workaround is to override the TCCL with a fully composite classloader before initializing <tt>TikaBridge</tt>, however this is horrible, a better solution would be to extract the TikaBridge and its dependencies in a custom module - so that the user could include this jar as an extension within its own appllication, together with the Tika dependencies. And alternative would be to bundle all necessary Tika dependencies.</p>
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