硒RC中使用Java的空指针异常

public int multiply(int x, int y) {
    return x * y;
}

public void news(){
    selenium.open(\"http://10.0.0.33:8080/Olio/\");           
}

public void testBank() throws Exception {
    Login lg = new Login(); 
    System.out.println(lg.multiply(4,8));
    lg.news();
    Thread.sleep(3000);             
}

java.lang.NullPointerExpression

selenium

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