CODEWITHSUNDEEP
javadatabasejspservletsjdbc
Myron Dsilva
Myron Dsilva

Reputation: 23

How do I convert Object to Integer in Servlet using getAttribute method?

String id = req.getSession().getAttribute("user_id").toString();
    int user_id=Integer.parseInt(id);

The error :

Cannot invoke "Object.toString()" because the return value of "javax.servlet.http.HttpServletRequest.getAttribute(String)" is null

I have also tried

String id = (String)req.getSession().getAttribute("user_id");
    int user_id=Integer.parseInt(id);

The error:

class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap')

Upvotes: 0

Views: 527

Answers (1)

Luke Woodward
Luke Woodward

Reputation: 65034

It seems the attribute is either an Integer value or is null.

Try something like the following:

Integer id = (Integer)req.getSession().getAttribute("user_id");
if (id != null) {
    int user_id = id;
    // code that uses user_id ...
}
else {
    // handle the case that there is no user ID.
}

Upvotes: 0

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