1. A computer-based method for controlling fine-grained security access to managed resources in a stateless web server architecture comprising: accessing a resource locator map by a computer containing a unique resource instance locator code representing each instance of each managed resource in a stateless web server architecture, wherein the managed resource is assigned to a plurality of application program components; associating a servlet filter for each of the application program components; authorizing by a computer the servlet filter based on a unique resource locator pattern by a servlet container such that each managed resource instance is identifiable by a unique resource locator; assigning by a computer different security constraints for different unique resource locator patterns in each deployment descriptor of the stateless web server architecture using a code comprising two or more security constraints specifying a unique resource instance locator pattern and a role name for the pattern; responsive to receiving from a user a validly-formatted Uniform Resource Locator request to access a unique resource instance, extracting a request pattern including at least a password value from a valid relative path portion of the validly-formatted Uniform Resource Locator request; mapping by a computer the extracted pattern to one or more of the application program components using an associated servlet filter; responsive to the mapping, performing by a computer fine-grained instance level security access to the application program component according to the assigned security constraints, wherein at least one security constraint comprises the extracted password associated with the role name; and responsive to successful security access, sending by a computer the user Uniform Resource Locator request to the mapped application program component, wherein the application program component receives and processes the user request; thereby providing different security access conditions to different instances of the same managed resource, and providing password authentication according to the pattern extracted from the relative path portion of the Uniform Resource Locator request.