Invalid bound statement (not found)和Mapped Statements collection already contains

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1、找到mapper.xml的<mapper  namespace="com.tencent.dao.UserDao">
 

原因：mapper的namespace和dao层里mapper接口类名称不一致

2、java.lang.IllegalArgumentException:

Mapped Statements collection already contains value for com.dao.UserMapper.selectByPrimaryKey

Caused by: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.fxy.dao.UserMapper.selectByPrimaryKey
	at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:859) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:831) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:655) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:302) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128) ~[mybatis-3.4.4.jar:3.4.4]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118) ~[mybatis-3.4.4.jar:3.4.4]
	... 71 common frames omitted

原因：xml的sql中有方法是相同的id，因为多次执行了逆向工程，然后xml的内容就叠加重复上去了
解决办法：删除相同id的内容或者删掉文件，重新生成