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关于was6连接池失效的问题，急！
系统上线后，不定时报以下错误，初步确认是was提供的连接池失效了，但为什么会失效，怎么解决，望各位大侠请教：
com.ecc.emp.jdbc.EMPJDBCException: Failed to execute SQL[Insert Into A_LOG_INFO (A_LOG_INFO.VIEW_TIME,A_LOG_INFO.LOG_TYPE,A_LOG_INFO.ITEMGROUP_ID,A_LOG_INFO.ITEMGROUP_NAME,A_LOG_INFO.LOG_CONTENT,A_LOG_INFO.USER_ID,A_LOG_INFO.USER_NAME,A_LOG_INFO.ORG_ID,A_LOG_INFO.ORG_NAME,A_LOG_INFO.LOGIN_IP,A_LOG_INFO.CUST_ID,A_LOG_INFO.CUST_NAME,A_LOG_INFO.PROCESSING_RESULT,A_LOG_INFO.MEMO,A_LOG_INFO.LOG_ID) Values (TIMESTAMP(?||''),?,?,?,?,?,?,?,?,?,?,?,?,?,?)]! caused by: The statement named in the EXECUTE statement is not in a prepared state or is a SELECT or VALUES statement. cause: com.ibm.websphere.ce.cm.StaleConnectionException: The statement named in the EXECUTE statement is not in a prepared state or is a SELECT or VALUES statement.
at com.ecc.emp.jdbc.sql.SQLExecService.executeSQLDef(SQLExecService.java:208)
com.ecc.emp.jdbc.EMPJDBCException: Failed to execute SQL[Insert Into A_LOG_INFO (A_LOG_INFO.VIEW_TIME,A_LOG_INFO.LOG_TYPE,A_LOG_INFO.ITEMGROUP_ID,A_LOG_INFO.ITEMGROUP_NAME,A_LOG_INFO.LOG_CONTENT,A_LOG_INFO.USER_ID,A_LOG_INFO.USER_NAME,A_LOG_INFO.ORG_ID,A_LOG_INFO.ORG_NAME,A_LOG_INFO.LOGIN_IP,A_LOG_INFO.CUST_ID,A_LOG_INFO.CUST_NAME,A_LOG_INFO.PROCESSING_RESULT,A_LOG_INFO.MEMO,A_LOG_INFO.LOG_ID) Values (TIMESTAMP(?||''),?,?,?,?,?,?,?,?,?,?,?,?,?,?)]! caused by: The statement named in the EXECUTE statement is not in a prepared state or is a SELECT or VALUES statement. cause: com.ibm.websphere.ce.cm.StaleConnectionException: The statement named in the EXECUTE statement is not in a prepared state or is a SELECT or VALUES statement.
at com.ecc.emp.jdbc.sql.SQLExecService.executeSQLDef(SQLExecService.java:208)