Where is configuration file on the Jira server

Hi,

My team came across a problem with a plugin and we need help…

We got a plugin code from other team and need to make it work. This plugin was written for internal use of the company. The frontend code of this plugin is on the server, the backend code and configuration file(pom.xml, Atlassian-plugin.xml) are packaged as a jar file which installed on the Jira website. The problem is: Frontend js/css files are mapped to the wrong place. There is no js/css mapping in the configuration file in the code of jar file, so there must be another configuration file on the server to mapping all the js/css file. But we can not found this configuration file on the server. Where could it possibly be on the server according to Jira’s architecture?

PS: Developer have tried to write new js/css configuration in plugin’s configuration file to override the existing configuration on the server, but it did not work…