Rupert Westenthaler created STANBOL-970:
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Summary: TikaEngine may fail if XML framewoks are present in the
Context ClassLoader
Key: STANBOL-970
URL: https://issues.apache.org/jira/browse/STANBOL-970
Project: Stanbol
Issue Type: Bug
Components: Engine - Tika
Affects Versions: enhancement-engines-0.10.0
Environment: Should only affect usages where Stanbol runs within an
Embedded OSGI environment and the host application uses XML framewoks
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
Priority: Minor
This is caused if the context ClassLoader (Thread#getContextClassLoader)
provides Implementations of XML frameworks.
Most Java XML libs prefer to load implementations by using the
Thread#getContextClassLoader(). However OSGI has no control over this
ClassLoader. Because of that there can be situations where Interfaces are
loaded via the Bundle Classloader and the implementations are taken from the
context Classloader.
Reported Exception can be very manifold. Typically one would expect
ClassCastException mentioning the same class two time. However more often
Errors such as ExceptionInInitializerError are reported, as loading of
implementations is often done by static members (or static blocks) and the JVM
can not report the real exception in such cases.
The only workaround for this problem is resetting the context ClassLoader with
the bundle ClassLoader.
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