NoMatchingMethodException No matching method for class hivedemon.UDFDemo with (int, int). Possible choices: 

代码如下：

public IntWritable evaluate(IntWritable num1, IntWritable num2){

        if(num1 == null || num2 == null){

            return null;

        }

        return new IntWritable(num1.get() + num2.get());

    }

报错如上。