web/src/main/java/org/springframework/security/web/authentication/preauth/websphere/WebSpherePreAuthenticatedProcessingFilter.java
protected Object getPreAuthenticatedPrincipal(HttpServletRequest httpRequest) {
		Object principal = wasHelper.getCurrentUserName();
		if (logger.isDebugEnabled()) {
			logger.debug("PreAuthenticated WebSphere principal: " + principal);
		}
		return principal;
	}
protected Object getPreAuthenticatedPrincipal(HttpServletRequest httpRequest) {
		Object principal = wasHelper.getCurrentUserName();
		if (logger.isDebugEnabled()) {
			logger.debug("PreAuthenticated WebSphere principal: " + principal);
		}
		return principal;
	}
Return the WebSphere user name.