Java Class error in Eclipse

When your code catches an exception you are simply printing the stacktrace and then allowing the function to continue.

However, after the catch blocks, you have no return statement, which is what the complaint is.

As others have mentioned, you're missing a return statement either in the catch blocks or after the catch blocks. Here's my boiler plate example of a function that returns a boolean:

bool foo()
{
    bool result = false;

    //do stuff, and set result to true at some point

    return result;
}

This pattern is beneficial because it helps reduce the number of returns in your functions. There are some coding styles out there that won't allow more than 2 return statements in a function, for example.

Here it is applied to your function:

public Boolean verifyLogin(LoginModel loginModel) { // In this line it is
                                                    // giving error
    Boolean result = false;
    DbConnection dbConnection = new DbConnection();
    ResultSet rs;
    try {
        Connection con = dbConnection.getConnection();
        System.out.println("Connection Established");
        String query = "select * from login where tenantid=? and userid=? and password=?";
        PreparedStatement ps = con.prepareStatement(query);
        ps.setInt(1, loginModel.getTenantid());
        ps.setString(2, loginModel.getUserid());
        ps.setString(3, loginModel.getPassword());
        rs = ps.executeQuery();
        if (rs.next()) {
            System.out.println("User exists !!");
            result = true; //--------------------This line changed!
        } else {
            System.out.println("User does not exists !!");
            result = false; //-------------------This line changed!
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}

You should return in catch blocks too. Or in finally block.

You need to add a return statement after your catch block.

Your method may throw an exception, in this case, the code that will be executed will be in the catch clauses.

Add a finally clause after the catch's with the desired value for when this happens.

The problem is that if an exception occurs, nothing is returned. I would suggest adding

return false;

to all of your catch blocks