Cannot View Thumbnails of the Attachments in the Issue
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
The thumbnails of the attached pictures are not visible in the issues although the 'Enable Thumbnails' field has been set 'ON' in Administration >> Global Settings >> Attachments.
The log file contains the following errors:
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ERROR - an.core.util.thumbnail.Thumber - Unable to create thumbnail image of attachment with id:11280
java.lang.IncompatibleClassChangeError: Found class com.sun.image.codec.jpeg.JPEGImageEncoder, but interface was expected
at com.atlassian.core.util.thumbnail.Thumber.storeThumbImage(Thumber.java:265)
at com.atlassian.core.util.thumbnail.Thumber.createThumbnail(Thumber.java:175)
Cause
The JIRA instance is using an unsupported Java distribution such as OpenJDK instead of Oracle JDK.
Resolution
Download and install an Oracle JDK version supported by the installed JIRA version.
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