NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because "userId" is null

🌳 에러 코드

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2023-05-11 14:24:59,562 DEBUG [org.springframework.web.servlet.DispatcherServlet] Failed to complete request: java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because "userId" is null

2023-05-11 14:24:59,564 ERROR [org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet]] Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because "userId" is null] with root cause

java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because "userId" is null

 

 

 

 

 

 

 

🌳 해결 방법

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🌾 원인 :  Controller에서는 Integer로 userId를 불렀으나 , BO에서 int로 userId를 불렀기에 NullPointerException 발생.

🌾 해결 방법 : BO도 타입을 Integer로 변경. 

 

 

 

<전>

 

- Controller

 

 

- BO

 

 

 

 

 

 

 

 

<후>

 

-BO