项目已经正式运行一段时间了！昨天报如上异常！求高人指点

项目已经正式运行一段时间了！昨天报如下错误！求高人指点
jboss 4.3.2
数据源配置：
<datasources>
 <local-tx-datasource>
    <jndi-name>asdfasdf</jndi-name>
    <connection-url>jdbc:oracle:thin:@192.168.13.55:1521:orcl</connection-url>
    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
    <user-name>asdfas</user-name>
    <password>asdfasd</password>
    <min-pool-size>1</min-pool-size>
    <max-pool-size>100</max-pool-size>
    <idle-timeout-minutes>1</idle-timeout-minutes>
  </local-tx-datasource>
异常：
012-03-22 09:20:21,421 WARN  [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Throwable while attempting to get a new connection: null
org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection)
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:161)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:508)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:207)
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:534)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:396)
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:299)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:448)
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:838)
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:102)
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:182)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:282)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:225)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy375.getUserNoReadMessage(Unknown Source)
at com.rongji.callcenter.web.struts.person.controller.OnlineMsgAction.onAction(OnlineMsgAction.java:42)
at com.rongji.callcenter.web.struts.BaseAction.execute(BaseAction.java:120)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at com.rongji.callcenter.web.struts.ActionServlet.process(ActionServlet.java:23)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)