紧急求救，ORA-01157: cannot identify/lock data file 7 - see DBWR trace file

数据库用plusql可以进行表的增删改，但是应用程序只能查看，一旦进行增删改则报下面的错误。
备注:系统运行稳定过几个月，数据库管理员做过数据库集群后，应用系统就无法使用了。请大神帮下忙11:31:29,546 ERROR [STDERR] java.sql.SQLException: ORA-01157: cannot identify/lock data file 7 - see DBWR trace file
ORA-01110: data file 7: '/dev/raykj_jianye_gl1'
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:330)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:287)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:742)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:206)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:945)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1053)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.T4CStatement.executeMaybeDescribe(T4CStatement.java:829)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1123)
11:31:29,546 ERROR [STDERR]     at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1263)
11:31:29,546 ERROR [STDERR]     at org.jboss.resource.adapter.jdbc.WrappedStatement.executeQuery(WrappedStatement.java:171)
11:31:29,546 ERROR [STDERR]     at org.apache.jsp.gov.gztx.yhzczb_jsp._jspService(yhzczb_jsp.java:140)
11:31:29,562 ERROR [STDERR]     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
11:31:29,562 ERROR [STDERR]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
11:31:29,562 ERROR [STDERR]     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
11:31:29,562 ERROR [STDERR]     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
11:31:29,562 ERROR [STDERR]     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
11:31:29,562 ERROR [STDERR]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
11:31:29,562 ERROR [STDERR]     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
11:31:29,562 ERROR [STDERR]     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
11:31:29,562 ERROR [STDERR]     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
11:31:29,562 ERROR [STDERR]     at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
11:31:29,562 ERROR [STDERR]     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
11:31:29,562 ERROR [STDERR]     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
11:31:29,562 ERROR [STDERR]     at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol
11:31:29,562 ERROR [STDERR]     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
11:31:29,562 ERROR [STDERR]     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
11:31:29,562 ERROR [STDERR]     at java.lang.Thread.run(Thread.java:662)