记录一次：Ambiguous collection type for property ‘ adds‘. You must specify ‘javaType‘ or ‘resultMap‘.错误；

           最近在学mybatis,在学习高级映射时，自己的xml配置基本和老师的一样，但就是因为collection property=" adds"这句多了一个空格就报了这个错，找半天。真无语

 
    
   
    select s.*,u.* from t10 s left join t11 u on u.a_umun=s.num 
    where s.name=#{name}
     

   
    
      
     
           
         
错误出现位置：
             
		        
		        
		        
		        



后台报错结果：​
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'com/bxit/mapper/UserMapper.xml'. Cause: org.apache.ibatis.builder.BuilderException: Ambiguous collection type for property ' adds'. You must specify 'javaType' or 'resultMap'.
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:123)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:95)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:378)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:120)
	... 4 more
Caused by: org.apache.ibatis.builder.BuilderException: Ambiguous collection type for property ' adds'. You must specify 'javaType' or 'resultMap'.
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.validateCollection(XMLMapperBuilder.java:412)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.processNestedResultMappings(XMLMapperBuilder.java:399)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.lambda$buildResultMappingFromContext$0(XMLMapperBuilder.java:383)
	at org.apache.ibatis.parsing.XNode.getStringAttribute(XNode.java:200)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildResultMappingFromContext(XMLMapperBuilder.java:382)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:280)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:254)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:246)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:119)
	... 7 more

​

改正后：

    
      
     
           
         
             
		        
		        
		        
		        
           
       
   

后台：
User [num=1, name=小明, age=15, adds=[Address [aid=1, city=上海, street=龙, user=null], Address [aid=2, city=上海, street=龙田, user=null]]]
Address [aid=1, city=上海, street=龙, user=null]
Address [aid=2, city=上海, street=龙田, user=null]

而且配置文档对于标签的顺序也有要求，一不小心就会报错，得万分小心！