in order to evaluate an add-on, you need to install it as dspecified here https://confluence.atlassian.com/display/UPM/Installing+add-ons
Go to your JIRA instance, then JIRA Administration -> Add-ons -> Find Add-on and Install it
Hope this helps,
Fabio's comment is correct: you have to install my add-on within JIRA as described by Atlassian.
If you download the JAR-file and double-click on it, an installed JVM will try to execute that but no java main()-function is available as the JIRA add-on/plugin system is based on OSGi-technology. You can install add-ons without the necessity to restart JIRA.
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