求助在weblogic运行的项目中有hibernate产生异常(运行1-2天后产生)

Question

####<2006-4-5 上午09时14分05秒 GMT+08:00> <Error> <Socket> <jfk1> <myserver> <ExecuteThread: '1' for queue: 'weblogic.socket.Muxer'> <<WLS Kernel>> <> <BEA-000403> <IOException occurred on socket: Socket[addr=/130.53.194.26,port=1301,localport=8000]
 java.net.SocketException: Connection refused.
java.lang.Throwable: Connection refused
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:134)
at weblogic.socket.SocketMuxer.readReadySocketOnce(SocketMuxer.java:672)
at weblogic.socket.SocketMuxer.readReadySocket(SocketMuxer.java:648)
at weblogic.socket.PosixSocketMuxer.processSockets(PosixSocketMuxer.java:123)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:32)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
> 
####<2006-4-5 上午09时21分23秒 GMT+08:00> <Error> <Socket> <jfk1> <myserver> <ExecuteThread: '2' for queue: 'weblogic.socket.Muxer'> <<WLS Kernel>> <> <BEA-000403> <IOException occurred on socket: Socket[addr=/130.53.194.26,port=1374,localport=8000]
 java.net.SocketException: Connection refused.
java.lang.Throwable: Connection refused
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:134)
at weblogic.socket.SocketMuxer.readReadySocketOnce(SocketMuxer.java:672)
at weblogic.socket.SocketMuxer.readReadySocket(SocketMuxer.java:648)
at weblogic.socket.PosixSocketMuxer.processSockets(PosixSocketMuxer.java:123)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:32)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
> 
hibernate.cfg.xml的配置内容如下:
<property name="show_sql">false</property>
<property name="connection.datasource">jdbc/gzmas</property>
<property name="jndi.url">http://10.156.76.9</property>
<property name="jndi.class">weblogic.jndi.WLInitialContextFactory</property>
    <property name="connection.username">weblogic</property>
<property name="connection.password">weblogic</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
...部份略
现在我有4个问题:
1  产生这异常的原因(微观上详细说明)?
2  hibernate使用的是自己的连接池还是weblogic上的连接池呢?weblogic配置池的配置会影响hibernate的连接池数量吗?这两者有啥关系?
3 在hibernate的session.connection()取的连接是从那来的?