hibernate.connection.provider_class异常：​​无法实例化连接提供程序

Question

我正在使用的休眠版本是3.2.5

这是我的cfg.xml文件的样子，我正在使用hibernate.connection.provider_class来检索连接：

<property name="hibernate.connection.provider_class">com.jdbc.ConnProvider</property>
<property name="hibernate.jdbc.batch_size">30</property>
<property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.cache.use_query_cache">false</property>
<property name="hibernate.cache.use_second_level_cache">false</property>
<property name="hibernate.connection.release_mode">after_transaction</property>
<property name="hibernate.connection.autocommit">true</property>
<property name="hibernate.connection.pool_size">0</property>
<property name="hibernate.current_session_context_class">thread</property>    
<property name="hibernate.show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>    

这是ConnProvider类：

    package com.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import org.hibernate.HibernateException;
import org.hibernate.connection.ConnectionProvider;

/**
 *
 * @author gOMzY
 */
class ConnProvider implements ConnectionProvider {

    @Override
    public Connection getConnection() throws SQLException {
        Connection conn = null;
        try{

            Class.forName("oracle.jdbc.OracleDriver");
            conn=DriverManager.getConnection("<url>","<username>","<pwd>");
            System.out.println("Connected!!!");
        }catch(Exception e){
            throw new UnsupportedOperationException("Not supported yet.");
        }
        return conn;
    }

    @Override
    public void closeConnection(Connection cnctn) throws SQLException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public boolean supportsAggressiveRelease() {
        return false;
    }

    @Override
    public void close() throws HibernateException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public void configure(Properties prprts) throws HibernateException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

}

我得到的例外：

严重：无法实例化连接提供程序     java.lang.IllegalAccessException：类org.hibernate.connection.ConnectionProviderFactory无法使用修饰符“”访问类com.infy.jdbc.ConnProvider的成员         at sun.reflect.Reflection.ensureMemberAccess（Unknown Source）         在java.lang.Class.newInstance0（未知来源）         在java.lang.Class.newInstance（未知来源）         在org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider（ConnectionProviderFactory.java:73）         在org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider（ConnectionProviderFactory.java:56）         在org.hibernate.cfg.SettingsFactory.createConnectionProvider（SettingsFactory.java:414）         在org.hibernate.cfg.SettingsFactory.buildSettings（SettingsFactory.java:62）         在org.hibernate.cfg.Configuration.buildSettings（Configuration.java:2009）         在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1292）         在com.infy.jdbc.HibernateStartup.main（HibernateStartup.java:19）

请建议如何解决此问题。

此致

Answer 1

请注意，您的连接提供商具有默认可见性，可能应该公开：

public ConnProvider implements ConnectionProvider { ... }