错误类型:反射。ReflectionException:无法设置属性“xxx”的“类”xxx”与价值“xxx”

This is the full text of the problem I'm having:

Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'providerName' of 'class com.smbms.pojo.Bill' with value 'Provider(id=null, proCode=null, proName=ShenzhenTaixiang Rice Co., Ltd., proDesc=null, proContact=null, proPhone=null, proAddress=null, proFax=null, createdBy=null, creationDate=null, modifyBy=null, modifyDate=null)' Cause: java.lang.IllegalArgumentException: argument type mismatch

In this case, he can still find out some of the results, but he will still report an error. The following picture is the console display of my error

Solution

This problem bothered me for an afternoon and was solved. In fact, the type of the resultMap tag under the complex type collection of a collection was written incorrectly, because I put myproviderName is defined as String type, but I wrote it as com.smbms.pojo.Provider in Type, which caused my program to have this problem all the time, even though I debugged a lot of other places to no avail.

This is my previous error code:

This is my modified code:

As you can see, change the type of the resultMap tag below to java.lang.String, and the operation is successful.

The following picture is the result after successful operation, you can see that the result found at this time is complete

But what makes me confused is that I changed javaType="com.smbms.pojo.Provider" to javaType=" java.lang.String" in the code below and stillThere is no mistake, I hope that friends who understand can leave a message in the comment area.

Supplementary knowledge points

collection

Collection of complex types, one-to-many

Inner nesting, mapping a nested result set to a list

Property property: The property of the entity object that maps the database column

ofType: full Java class name or alias (types included in the collection)

     resultMap: reference to external resultMap

Child element id

     result      property: property of the entity object that maps the database column