No exception of type DataAccessException can be thrown; an exception type must be a subclass of Throwable

Question

My source code like below. It has a error, "No exception of type DataAccessException can be thrown; an exception type must be a subclass of Throwable".

I can't understand why the error ocurrs. let me know. thx.

package com.sds.afi.cosmos.cmm.db.impl;

import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.ibatis.SqlMapClientTemplate;
import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;
import org.springframework.stereotype.Repository;

import com.sds.afi.cosmos.cmm.db.MainDao;

@Repository
//@SuppressWarnings("unchecked")   // 부적절한 컴파일러의 경고를 제거
public class MainDaoImpl extends SqlMapClientDaoSupport  implements MainDao {

    @Autowired
    private SqlMapClientTemplate sqlMapClientTemplate;

    @SuppressWarnings("unchecked")
    @Override
    public List<HashMap> getUserInfo() throws DataAccessException {

        List<HashMap> lists;

        lists = sqlMapClientTemplate.queryForList("common.getList");

        return lists;
    }

}

Answer 1

This can happen if some class in the type-hierarchy of the exception is not on the class-path. In that case, its not possible to verify whether the exception really extends Throwable, whether it is a checked one or not, etc. Hence the errors. e.g superclass of Dataaccessexception : NestedRuntimeException may be missing from the class-path as it is in a differnt jar i.e. spring-core.

Answer 2

Your DataAccessException is not a subclass of Throwable class (extends Throwable). It should be, and without this inheritance, your code is not compilable with the current throws clause.

Here is an example: http://www.osix.net/modules/article/?id=754