RaahulUmapathy created TIKA-4130:
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Summary: Conflict with duplicate org/w3c and org/xml packages in
tika-app jar
Key: TIKA-4130
URL: https://issues.apache.org/jira/browse/TIKA-4130
Project: Tika
Issue Type: Improvement
Affects Versions: 2.7.0
Environment: Java 8
Reporter: RaahulUmapathy
While attempting to migrate from version 1.20 to version 2.7 of Apache Tika, I
encountered a specific error.
We have been using a "child-first classloader" to isolate the tika-app JAR from
the classpath for file parsing.
{+}The error message we're facing is as follows{+}:
java.lang.LinkageError: loader constraint violation: when resolving overridden
method
"org.apache.xerces.jaxp.DocumentBuilderImpl.newDocument()Lorg/w3c/dom/Document;"
the class loader (instance of org/xeustechnologies/jcl/JarClassLoader) of the
current class, org/apache/xerces/jaxp/DocumentBuilderImpl, and its superclass
loader (instance of <bootloader>), have different Class objects for the type
org/w3c/dom/Document used in the signature.
Upon analysis, I can see that a conflict exists between the default classloader
(rt.jar) and our child-first classloader due to different versions of the class
"Node.class" (org/w3c package) in both jars. Similar issues were encountered
with the classes in "org/xml" package too.
{+}The parsing functionality worked correctly after removing the following
packages from the tika-app JAR{+}:
1. org/w3c/**
2. org/xml/**
We are currently using Java 8 and would greatly appreciate guidance on the same.
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