Problem
Unable to install app by uploading jar file.
Error returned:
An unexpected error occured. Refer to the logs for more information
Solution 1 - Install using app URL from marketplace
This works only if you instance can reach the marketplace site. Otherwise, please try Solution 2.
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Go to app listing on the Atlassian marketplace
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Retrieve app URL
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Paste the app URL and click on Upload
Solution 2 - Install app manually
You will need access to your Jira server
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Download the jar file from Atlassian marketplace
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Shut down Jira instance
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Copy the JAR file (e.g., AttachmentChecker-5.9.0.jar) into your JIRA home directory under
plugins/installed-plugins/ -
Start JIRA
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Confirm the installation by going to Administration > Manage Add-ons. Attachment Checker should appear in the list as enabled.
Root Cause
The .jar file size is too big.