[Cross-posted]
We recently upgraded to 8.3 from 8.2 and noticed our IIIF viewer stopped
working. We are using Cantaloupe as the image server. We had no issues in
8.2. We are specifically getting a 500 error for the manifest endpoint
(e.g. https://example.org/server/iiif/item-uuid/manifest).
Tim has pointed out that no changes have been made in the IIIF integration
in 8.3 so we don't really know why it's happening.
Has anyone encountered a similar issue? Any thoughts and suggestions are
welcome. Thank you!
The specific log messages we get are:
*2026-01-16 15:19:07,177 ERROR unknown 7b622ca6-b90e-40bf-8e4f-824266d9a760
org.dspace.app.rest.exception.DSpaceApiExceptionControllerAdvice @ An
exception has occurred (status:500)*
jakarta.servlet.ServletException: Handler dispatch failed:
java.lang.NoClassDefFoundError: Could not initialize class
de.digitalcollections.iiif.model.MimeType
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1104)
*Caused by: java.lang.NoClassDefFoundError: Could not initialize class
de.digitalcollections.iiif.model.MimeType*
at
de.digitalcollections.iiif.model.ImageContent.<init>(ImageContent.java:36)
at
org.dspace.app.iiif.model.generator.ImageContentGenerator.<init>(ImageContentGenerator.java:29)
at
org.dspace.app.iiif.service.ManifestService.setLogoContainer(ManifestService.java:302)
*Caused by: java.lang.ExceptionInInitializerError: Exception
java.lang.IllegalStateException: Duplicate key application/gzip (attempted
merging values application/gzip and application/gzip) [in thread
"ajp-nio-127.0.0.1-8009-exec-8"]*
at
java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:135)
at
java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:182)
at
java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
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