Cannot install Attachment Checker by uploading .jar file
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.
Go to app listing on the Atlassian marketplace
Retrieve app URL
Paste the app URL and click on Upload
Solution 2 - Install app manually
You will need access to your Jira server
Download the jar file from Atlassian marketplace
Shut down Jira instance
Copy the JAR file (e.g., AttachmentChecker-5.9.0.jar) into your JIRA home directory under
plugins/installed-plugins/
Start JIRA
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.