记java.lang.InstantiationException错误

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昨天在用postmen测试接口时报”java.lang.InstantiationException“错误，决定记录下来以及给大家参考；错误提示如下：

七月 26, 2019 8:41:10 下午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [springMVC] in context with path [/paperBagPrinting] threw exception [Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.servlet.http.HttpServlet]: Is it an abstract class?; nested exception is java.lang.InstantiationException] with root cause
java.lang.InstantiationException
    at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)

最后发现原来是在import的时候出错了，下面是加零建的类

public Map<String,Object> getCourseCode
(HttpServletRequest Request,HttpServletResponse Response,
String courseName){

}

这是我写的import语句，在编译的时候没报错，运行的时候会报错：import javax.servlet.http.HttpServlet；

正确的写法应该是：

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

改正错误后就可以运行了。