I come to know one bug in the project while opening /group-edit.jsp page and “HR & Admin” as the group name.
While the page is rendered the group name value is not URL encoded and hence it gives an error with the message “HR group not found”.
Here is the generated link, which is not working: /group-edit.jsp?group=HR%20&%20Admin
Here is the tested link by me, which is working : /group-edit.jsp?group=HR%20%26%20Admin