JQL Module when deployed is making the issue search page blank

[AnupamS]

I am writing a JQL function module in a custom plugin. I created it using the command line and even with the basic skeleton (default methods), when I deploy it, the search issue page gets blank and even the place to type JQL is not coming. Disabling the module makes it appear again normally.

I tried going for the default classes, as well as one in the cookbook. Both are building and I can see them successfully appearing in the modules for the plugin, but before I can test the function name appearing, it is not even getting loaded.

I tried the below link to create the xml and java stubs. 

https://developer.atlassian.com/server/jira/platform/adding-a-jql-function-to-jira/

Even after successful build, the search for issue page is blank

What am I missing?