quartz在web中有时罢工,急

quartz集成到tomcat采用是使用 ServletContextListener方案，参见http://www.blogjava.net/Unmi/archive/2008/05/01/197657.htmltomcat运行一段时间后，控制台报以下错误
2009-03-06 09:38:21 [org.quartz.core.ErrorLogger]-[ERROR] An error occured while scanning for the next trigger to fire.
org.quartz.JobPersistenceException: Couldn't rollback jdbc connection. Io 异常: Connection reset by peer: socket write error [See nested exception: java.sql.SQLException: Io 异常: Connection reset by peer: socket write error]
at org.quartz.impl.jdbcjobstore.JobStoreSupport.rollbackConnection(JobStoreSupport.java:2319)
at org.quartz.impl.jdbcjobstore.JobStoreTX.acquireNextTrigger(JobStoreTX.java:1222)
at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:233)
* Nested Exception (Underlying Cause) ---------------
java.sql.SQLException: Io 异常: Connection reset by peer: socket write error
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:333)
at oracle.jdbc.driver.OracleConnection.rollback(OracleConnection.java:1380)
at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:328)
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.rollback(PoolingDataSource.java:312)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.rollbackConnection(JobStoreSupport.java:2317)
at org.quartz.impl.jdbcjobstore.JobStoreTX.acquireNextTrigger(JobStoreTX.java:1222)
at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:233)
2009-03-06 09:38:46 [org.quartz.impl.jdbcjobstore.JobStoreTX]-[ERROR] MisfireHandler: Error handling misfires: Couldn't rollback jdbc connection. Io 异常: Connection reset by peer: socket write error
org.quartz.JobPersistenceException: Couldn't rollback jdbc connection. Io 异常: Connection reset by peer: socket write error [See nested exception: java.sql.SQLException: Io 异常: Connection reset by peer: socket write error]
at org.quartz.impl.jdbcjobstore.JobStoreSupport.rollbackConnection(JobStoreSupport.java:2319)
at org.quartz.impl.jdbcjobstore.JobStoreTX.doRecoverMisfires(JobStoreTX.java:1361)
at org.quartz.impl.jdbcjobstore.JobStoreSupport$MisfireHandler.manage(JobStoreSupport.java:2449)
at org.quartz.impl.jdbcjobstore.JobStoreSupport$MisfireHandler.run(JobStoreSupport.java:2468)
* Nested Exception (Underlying Cause) ---------------
java.sql.SQLException: Io 异常: Connection reset by peer: socket write error
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:333)
at oracle.jdbc.driver.OracleConnection.rollback(OracleConnection.java:1380)
at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:328)
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.rollback(PoolingDataSource.java:312)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.rollbackConnection(JobStoreSupport.java:2317)
at org.quartz.impl.jdbcjobstore.JobStoreTX.doRecoverMisfires(JobStoreTX.java:1361)
at org.quartz.impl.jdbcjobstore.JobStoreSupport$MisfireHandler.manage(JobStoreSupport.java:2449)
at org.quartz.impl.jdbcjobstore.JobStoreSupport$MisfireHandler.run(JobStoreSupport.java:2468)
附开发环境:
winxp+eclipse3.2.2+jdk5.0+tomcat5.5.20+quartz1.5.2