oracle插入数据几分钟后自动断开

java项目 使用jsf+openjpa+spring的框架。
使用jdbc查询出数据，再用openjpa插入到另一个表中，数据量在几万条左右，每隔几分钟到十分钟左右，就会报错，相同的代码，别人的电脑就不会报错。错误提示如下：
org.springframework.orm.jpa.JpaOptimisticLockingFailureException: Unable to obtain an object lock on "null".; nested exception is <openjpa-2.1.0-r422266:1071316 fatal store error> org.apache.openjpa.persistence.OptimisticLockException: Unable to obtain an object lock on "null".
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:300)
at org.springframework.orm.jpa.DefaultJpaDialect.translateExceptionIfPossible(DefaultJpaDialect.java:120)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.orm.jpa.JpaAccessor.translateIfNecessary(JpaAccessor.java:152)
at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:188)
at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:146)
at cn.wiztek.web.manual.datasource.dao.impl.CommonDaoImpl.findObjectListByParam(CommonDaoImpl.java:130)
at cn.wiztek.datamove.wchpfms.service.WchpfmsContractpayServiceImpl.operContractpay(WchpfmsContractpayServiceImpl.java:85)
at cn.wiztek.datamove.imp.ImpContractpay.impContractpay(ImpContractpay.java:44)
at cn.wiztek.datamove.imp.ImpContractpay.main(ImpContractpay.java:18)
Caused by: <openjpa-2.1.0-r422266:1071316 fatal store error> org.apache.openjpa.persistence.OptimisticLockException: Unable to obtain an object lock on "null".
at org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java:4851)
at org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.java:4829)
at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:136)
at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:110)
at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:62)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connect(JDBCStoreManager.java:978)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.getConnection(JDBCStoreManager.java:269)
at org.apache.openjpa.jdbc.kernel.PreparedSQLStoreQuery$PreparedSQLExecutor.executeQuery(PreparedSQLStoreQuery.java:104)
at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:1005)
at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:863)
at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:794)
at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:542)
at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:305)
at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:319)
at cn.wiztek.web.manual.datasource.dao.impl.CommonDaoImpl$6.doInJpa(CommonDaoImpl.java:134)
at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:183)
... 5 more
Caused by: java.sql.SQLException: The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
at java.sql.DriverManager.getConnection(DriverManager.java:579)
at java.sql.DriverManager.getConnection(DriverManager.java:190)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
at org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection(DelegatingDataSource.java:131)
at org.apache.openjpa.lib.jdbc.DecoratingDataSource.getConnection(DecoratingDataSource.java:106)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connectInternal(JDBCStoreManager.java:989)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connect(JDBCStoreManager.java:974)
... 15 more
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422)09-27 16:20:34.851 ERROR [CommonDaoImpl.java:138] -----execute failed-----oraclejdbcjavajsf