### Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: Executor was clos

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在运行一个mybatis程序中出现了如下错误：

信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: org.apache.ibatis.executor.ExecutorException: Executor was closed.
### Cause: org.apache.ibatis.executor.ExecutorException: Executor was closed.
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

出现这种错误主要是我们调用一个对象的时候获取的sqlSession对象但是它只创建一次，一旦关闭，后面就会报错

解决方法：我们将它封装起来：

private SqlSession sqlSession;

private SqlSession getSqlSession() {
    sqlSession=SqlSessionFactoryUtils.getSqlSessionFactory().openSession();
    return sqlSession;
}
public List<Users> findAll() {
    try {
        list = getSqlSession().selectList("findAll");
    } catch (Exception ex) {
        ex.printStackTrace();
    }finally {
        sqlSession.close();
    }
    return list;
}

调用私有函数去获得sqlSession对象，这样就解决了上述问题。