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https://issues.apache.org/jira/browse/TIKA-1145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699793#comment-13699793
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Uwe Schindler commented on TIKA-1145:
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I think the main problem is ServiceLoader's definition. It uses context class
loader to load SPIs which is in my opinion a "bug" in the spec. In Lucene we
had the same problems with our own ServiceLoader impl that uses the Abstract
class'/interface's classloader to loads its own implementations. See
LUCENE-4713 for more info, where Lucene uses SPI to load its codecs and
analyzers.
> classloaders issue loading resources when extending Tika
> --------------------------------------------------------
>
> Key: TIKA-1145
> URL: https://issues.apache.org/jira/browse/TIKA-1145
> Project: Tika
> Issue Type: Bug
> Components: config, mime
> Affects Versions: 1.3
> Environment: Tika as part of standard Solr distribution
> Reporter: Maciej Lizewski
>
> I noticed that ServiceLoader is using different classloader when loading
> 'services' like Parsers, etc (java.net.FactoryURLClassLoader) than
> MimeTypesFactory (org.eclipse.jetty.webapp.WebAppClassLoader) when loading
> mime types definitions. As result - it works completely different:
> When jar with custom parser and custom-mimetypes.xml is added to solr.war -
> both resources are located and loaded
> (META-INF\services\org.apache.tika.parser.Parser and
> org\apache\tika\mime\custom-mimetypes.xml) and everything works fine.
> When jar with custom parser is in Solr core lib and configured in
> solrconfig.xml - only META-INF\services\org.apache.tika.parser.Parser is
> loaded, but custom-mimetypes.xml is ignored.
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