mybatis错误:There is no getter for property named 'xxx' in 'class java.lang.String'

Caused by: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'parentId' in 'class java.lang.String'
at org.apache.ibatis.reflection.Reflector.getGetInvoker(Reflector.java:333)
at org.apache.ibatis.reflection.MetaClass.getGetInvoker(MetaClass.java:160)
at org.apache.ibatis.reflection.wrapper.BeanWrapper.getBeanProperty(BeanWrapper.java:151)
at org.apache.ibatis.reflection.wrapper.BeanWrapper.get(BeanWrapper.java:44)
at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:123)
at org.apache.ibatis.builder.xml.dynamic.DynamicContext$ContextMap.get(DynamicContext.java:89)
at org.apache.ibatis.builder.xml.dynamic.DynamicContext$ContextAccessor.getProperty(DynamicContext.java:107)
at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1657)
at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:92)
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
at org.apache.ibatis.ognl.ASTNotEq.getValueBody(ASTNotEq.java:49)
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:333)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:413)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:395)
at org.apache.ibatis.builder.xml.dynamic.OgnlCache.getValue(OgnlCache.java:42)
at org.apache.ibatis.builder.xml.dynamic.ExpressionEvaluator.evaluateBoolean(ExpressionEvaluator.java:32)
at org.apache.ibatis.builder.xml.dynamic.IfSqlNode.apply(IfSqlNode.java:30)
at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
at org.apache.ibatis.builder.xml.dynamic.TrimSqlNode.apply(TrimSqlNode.java:42)
at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
at org.apache.ibatis.builder.xml.dynamic.TrimSqlNode.apply(TrimSqlNode.java:42)
at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
at org.apache.ibatis.builder.xml.dynamic.MixedSqlNode.apply(MixedSqlNode.java:29)
at org.apache.ibatis.builder.xml.dynamic.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:37)
at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:241)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:79)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:101)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:95)
at sun.reflect.GeneratedMethodAccessor143.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:355)
... 73 more

解决方法1：将参数名（上面的例子为’parentId’）替换为”_parameter”  解决方法2：Dao层接口方法的参数声明加上@Param("parentId")如：List<Inner> findInnerByPid(@Param("parentId") String parentId);