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A trinomial expression that causes a null pointer

2022-04-23 04:59:00 【GreatorMan】

Developing user systems , Use... In role types in user permissions get Method in data copy , Keep reporting null pointer ：

At the time of testing the data copy , The copy time is consistent and null pointer is reported , Later, according to the analysis and debugging, it is found that roleTypeKey The data is returned in the roleTypeKey It's empty , This is caused by the problem of data packing and unpacking ; enumeration RoleType Type in the Key by int data type , After the program is compiled, it is as follows ：

@Transient
private Integer roleTypeKey;

public Interger getRoleTypeKey(){
  return getRoleType() != null ? getRoleType().getEnumItem().getItamKey():roleTypeKey.intVal();
}

 

When roleTypeKey When the data is empty Copy call getRoleTypeKey(); Method is null pointer ;

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https://yzsam.com/2022/04/202204220553102266.html

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