[TIKA-1507] Under OSGi, ForkParser failes to send core parser classes like ExternalParser

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6, 1.7
• Fix Version/s: 1.12
• Component/s: packaging, parser
• Assignee: Bob Paulin
• Reporter: Nick Burch
• Created: 07/Jan/15 15:26
• Updated: 04/Nov/15 04:53
• Resolved: 04/Nov/15 04:05

Description

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