#vulnerable code 
                                public int onDoStartTag() throws JspException {
        if ( getSecurityContext().isAuthenticated() ) {
            return TagSupport.EVAL_BODY_INCLUDE;
        } else {
            return TagSupport.SKIP_BODY;
        }
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public int onDoStartTag() throws JspException {
        if ( getSecurityContext() != null && getSecurityContext().isAuthenticated() ) {
            return TagSupport.EVAL_BODY_INCLUDE;
        } else {
            return TagSupport.SKIP_BODY;
        }
    }