求助: visual JSF Table 一个问题

我用NetBeans 6.1 的visual jsf Table删除一行数据,代码如下:
try {
            RowKey rk = tableRowGroup1.getRowKey();
            
            if (rk != null) {
                tjsbDataProvider.removeRow(rk);
                tjsbDataProvider.commitChanges();} catch(Exception ex) {
            log("ErrorDescription", ex);
            error(ex.getMessage());
}老是收到如下异常,该行无法删除:
严重: ErrorDescription
java.lang.RuntimeException: Number of conflicts while synchronizing: 1 SyncResolver.DELETE_ROW_CONFLICT row 0  [Microsoft][SQLServer 2000 Driver for JDBC]Can't start a cloned connection while in manual transaction mode.
at com.sun.data.provider.impl.CachedRowSetDataProvider.commitChanges(CachedRowSetDataProvider.java:1004)
at javaclub_t.SH_Article.delete_action(SH_Article.java:268)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.el.parser.AstValue.invoke(AstValue.java:152)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:77)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
at com.sun.rave.web.ui.appbase.faces.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
at javax.faces.component.UICommand.broadcast(UICommand.java:383)
at com.sun.webui.jsf.component.WebuiCommand.broadcast(WebuiCommand.java:160)
at com.sun.webui.jsf.component.TableRowGroupBase.broadcast(TableRowGroupBase.java:1402)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:447)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:752)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.execute(PartialTraversalLifecycle.java:94)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:267)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.sql.rowset.spi.SyncProviderException: Number of conflicts while synchronizing: 1
at com.sun.sql.rowset.internal.CachedRowSetXWriter.writeData(CachedRowSetXWriter.java:529)
at com.sun.sql.rowset.CachedRowSetXImpl5.acceptChanges(CachedRowSetXImpl5.java:955)
at com.sun.data.provider.impl.CachedRowSetDataProvider.commitChanges(CachedRowSetDataProvider.java:959)
... 36 more这是怎么回事啊, 大侠们帮帮忙...!