才开始学习jsp，自己写了一个通过jsp操作Oracle的程序（实质是照着书本例子抄的），代码应该没有问题。通过tomcat部署的时候，Myeclipse提示错误如下：
Problems occurred when invoking code from plug-in: "org.eclipse.jface".
查看了error log 具体如下：
Problems occurred when invoking code from plug-in: "org.eclipse.jface".
java.lang.NullPointerException
at com.genuitec.eclipse.ast.deploy.core.ui.dialog.DeploymentLabelProvider.getColumnText(Unknown Source)
at org.eclipse.jface.viewers.TableColumnViewerLabelProvider.update(TableColumnViewerLabelProvider.java:70)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:135)
at org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(AbstractTableViewer.java:386)
at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:466)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:857)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:199)
at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2026)
at org.eclipse.jface.viewers.AbstractTableViewer.createItem(AbstractTableViewer.java:264)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:741)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:633)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:620)
at org.eclipse.jface.viewers.AbstractTableViewer$2.run(AbstractTableViewer.java:576)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1368)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1330)
at org.eclipse.jface.viewers.CheckboxTableViewer.preservingSelection(CheckboxTableViewer.java:295)
at org.eclipse.jface.viewers.AbstractTableViewer.inputChanged(AbstractTableViewer.java:574)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:251)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1606)
at com.genuitec.eclipse.ast.deploy.core.ui.dialog.DeploymentManagerDialog.updateDeploymentsViewerForProject(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.ui.dialog.DeploymentManagerDialog.handleProjectsComboBoxModified(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.ui.dialog.DeploymentManagerDialog$1.modifyText(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:166)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)