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https://issues.apache.org/jira/browse/TIKA-1507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14632289#comment-14632289
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Michal Hlavac commented on TIKA-1507:
-------------------------------------
I didn't find "good" solution to use ForkParser in OSGi. Everytime it breaks
something else, so I created parallel tika-bundle which works with ForkParser.
Link: https://github.com/hlavki/tika-bundle-fork
> Under OSGi, ForkParser failes to send core parser classes like ExternalParser
> -----------------------------------------------------------------------------
>
> Key: TIKA-1507
> URL: https://issues.apache.org/jira/browse/TIKA-1507
> Project: Tika
> Issue Type: Bug
> Components: packaging, parser
> Affects Versions: 1.6, 1.7
> Reporter: Nick Burch
> Attachments: TIKA-1507C.patch
>
>
> Under OSGi, if you try to use ForkParser with the Tesseract OCR parser, it
> will fail with:
> java.lang.NoClassDefFoundError: org/apache/tika/parser/external/ExternalParser
> at
> org.apache.tika.parser.ocr.TesseractOCRParser.hasTesseract(TesseractOCRParser.java:117)
> at
> org.apache.tika.parser.ocr.TesseractOCRParser.getSupportedTypes(TesseractOCRParser.java:91)
> at
> org.apache.tika.parser.CompositeParser.getParsers(CompositeParser.java:81)
> at
> org.apache.tika.parser.DefaultParser.getParsers(DefaultParser.java:95)
> at
> org.apache.tika.parser.CompositeParser.getParser(CompositeParser.java:209)
> at
> org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:244)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> at org.apache.tika.fork.ForkServer.call(ForkServer.java:144)
> at org.apache.tika.fork.ForkServer.processRequests(ForkServer.java:124)
> at org.apache.tika.fork.ForkServer.main(ForkServer.java:69)
> Caused by: java.lang.ClassNotFoundException: Unable to find class
> org.apache.tika.parser.external.ExternalParser
> at
> org.apache.tika.fork.ClassLoaderProxy.findClass(ClassLoaderProxy.java:117)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> ... 13 more
> ExternalParser lives in the Tika Core jar, not the Tika Parsers one. This all
> works fine outside of OSGi, so it looks like something about the OSGi
> bundling is causing the fork parser to fail to send the parser-related
> classes from Tika Core over to the forked JVM
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