How to create Jira plugin of already created spring framework java web based application?

Jira Development Jira Server
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Hi All,

I am new to Jira Plugin and what I am doing I have already one application with backend “Spring Framework Web based” and for front-end I have used “Angular” now I want to integrate/create a Jira plugin of this application but I am not sure how to properly configure it properly. Could anyone please guide me how can we do it? In pom.xml I have included all my dependencies also I have included all my code in plugin but when I am running plugin my plugin is not getting enabled.

 ___ FAILED PLUGIN REPORT _____________________
[INFO] [talledLocalContainer]
[INFO] [talledLocalContainer]     2 plugins failed to load during JIRA startup.
[INFO] [talledLocalContainer]
[INFO] [talledLocalContainer]           'com.myPlugin-tests' - 'myPlugin'  failed to load.
[INFO] [talledLocalContainer]                   Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.eclipse.org/gemini/blueprint/schema/blueprint]
[INFO] [talledLocalContainer]     Offending resource: URL [bundle://18.0:0/META-INF/spring/atlassian-plugins-component-imports.xml]
[INFO] [talledLocalContainer]

Please help to how create plugin from existing application or migration documentation for it.