Error: FileNotFound thrown while trying to use antisamy-tinymce.xml OWASP

Question

I am working on a project that takes html from the user and persist to the DB. The current implementation is vulnerable to XSS attack.

In order to prevent this attack, I am trying to implement the OWASP Antisamy as seen here but I am getting fileNotFoundError for the policy that I have downloaded and put in the resources directory of the project.

Code

//sanitize welcomeMessage
try {
    Policy policy = Policy.getInstance(new File("antisamy-tinymce.xml"));
    AntiSamy as = new AntiSamy();
    CleanResults cr = as.scan(welcomeMessage, policy);
    preferences.setWelcomeMessage(cr.getCleanHTML());
} catch (PolicyException | ScanException e) {
    FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN, "Invalid Welcome Message", e.getMessage()));
    return;
}

Project Structure

.
└── src/
    └── main/
        └── resources/
            ├── antisamy-tinymce.xml

Any pointer to what I might be doing wrongly?

I have tried using the absolute path of the antisamy-tinymce.xml file but it doesn't work when deployed to the application server.