使用DBUtils报错connot create bean 错误解决的办法

最新推荐文章于 2023-11-11 20:00:40 发布

一只小芒果o

最新推荐文章于 2023-11-11 20:00:40 发布

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public class c3p0_connection {
	public static void main(String[] args) throws Exception {
        ComboPooledDataSource source = new ComboPooledDataSource();//创建对象
        String sql="select  * from root";
        QueryRunner runner = new QueryRunner(source);
        List<Root> list = runner.query(sql,new BeanListHandler<Root>(Root.class));
       for (Root root : list) {
    	   System.out.println(root.getPassword());
    	   System.out.println(root.getUsername()); 
	}
}

Exception in thread "main" java.sql.SQLException: Cannot create JavaBean.Root: JavaBean.Root Query: select * from root Parameters: []
   at org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:527)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:391)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:347)
   at JavaBean.c3p0_connection.main(c3p0_connection.java:14)

一直报错：connot create bean 。原因是Root类中没有无参构造，补充一个无参函数即可解决问题