undertow/src/main/java/org/wildfly/extension/undertow/security/SecurityActions.java
static void setSecurityContextOnAssociation(final SecurityContext sc) {
        if (WildFlySecurityManager.isChecking()) {
            WildFlySecurityManager.doUnchecked(new PrivilegedAction<Void>() {
                @Override
                public Void run() {
                    SecurityContextAssociation.setSecurityContext(sc);
                    return null;
                }
            });
        } else {
            SecurityContextAssociation.setSecurityContext(sc);
        }
    }
static void setSecurityContextOnAssociation(final SecurityContext sc) {
        if (WildFlySecurityManager.isChecking()) {
            WildFlySecurityManager.doUnchecked(new PrivilegedAction<Void>() {
                @Override
                public Void run() {
                    SecurityContextAssociation.setSecurityContext(sc);
                    return null;
                }
            });
        } else {
            SecurityContextAssociation.setSecurityContext(sc);
        }
    }
Set the {@code SecurityContext} on the {@code SecurityContextAssociation}

@param sc the security context