shiro web step by step example not work,stormpath is moved

shiro web example I follow this,but in step 2,the stormpath is moved to another site okta,so i don`t what shall i do. There is an exception:

java.lang.IllegalStateException: Unable to load credentials from any provider in the chain.

So I write a reamls by myself.

public class CustomSecurityRealm extends JdbcRealm{

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        UsernamePasswordToken upToken = (UsernamePasswordToken) token;
        char[] psw = upToken.getPassword();
        String username = upToken.getUsername();
        return  new SimpleAuthenticationInfo(username, psw, getName());
    }

    @Override
    public void setDataSource(DataSource dataSource) {
        // TODO Auto-generated method stub
        DruidDataSource ds=new DruidDataSource();
        ds.setUrl("jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=utf8&autoReconnect=true&rewriteBatchedStatements=TRUE");
        ds.setUsername("root");
        ds.setPassword("root");
        dataSource=ds;
    }
}

And in shiro.ini I change securityManager.realm = $stormpathRealm to securityManager.realm = realm.CustomSecurityRealm But exception is the same.Or sometimes no error when I delete it from tomcat and add again,but home page is not found --404. I hate this,i just want to see how to use shiro in web project,why it is so hard? I have no jndi,so I don`t copy from this example,I just want to make things simplest.How can I run the web sample?