sprintBoot + mybatis报错：org.apache.ibatis.binding.BindingException: Invalid bound statement

sprintBoot + mybatis报错：org.apache.ibatis.binding.BindingException: Invalid bound statement

项目报这个异常，认核对了：
1、mapper.xml的命名空间（namespace）是否跟mapper接口的包名一致？
2、接口的方法名，与xml中的一条sql标签的id一致
3、如果接口中的返回值List集合（不知道其他集合也是），那么xml里面的配置，尽量用resultMap（保证resultMap配置正确）,不要用resultType

认真核对后均没有问题，application.properties里配置如下：

很显然异常是在说没找到对应的方法，或者说没有对应方法的sql。

之前配置xml方式的mybatis都是在application.properties中添加一行

mybatis.mapper-locations=classpath:mappers/**/*.xml

就行了。但是始终报异常。后来发现是多数据源的问题
因为多数据源是通过@contigration注解的Java类编程配置的，所以这种方式并不能读取到mapper的xml文件在哪。

解决方法是分别在mybatis配置类中生成SqlSessionFactory的方法中配置mapper路径

sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mappers/**/*.xml"));

package com.zm.appletinterface.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration(value = "zzymoracle")
@MapperScan(basePackages = "com.zm.appletinterface.dao",sqlSessionTemplateRef = "orcaleSqlSessionTemplate")
public class Org8DataSourceConfig {

    @Bean(name = "oracleDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.zzymoracle")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }


    @Bean(name = "oracleSqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("oracleDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();

        //bean.setMapperLocations(new PathMatchingResourcePatternResolver()
        //        .getResources("classpath:mapper/**/*.xml"));

        bean.setMapperLocations(new PathMatchingResourcePatternResolver()
               .getResources("classpath:mapper/*.xml"));

        bean.setDataSource(dataSource);
        return bean.getObject();
    }

    @Bean(name = "oracleTransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("oracleDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "orcaleSqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("oracleSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}