my OS is win2000, i've already added the jdbc driver into my computer, and i'm sure it runs well. because i can use it in tomcat, and i can run my jsp code, and i can connect to oracle, list or modify the data. in a word, jdbc driver is ok.

and i've add the .config file and library just follow the instrctions of the jbuilder help.

i added a database component into a frame. in the connection dialog, the "driver" list oracle driver, and the color is not red. which means it can work. the "url" gap, i filled :jdbc:oracle:thin:@10.224.15.110:1521:ora816 . of course, it's right. and i didn't forget to fill the username and password.

but, when i cliked the test connection button, it poped up a error message:Chain of 2 or more Exceptions occurred.
the detail errormessage is:

See com.borland.dx.dataset.DataSetException error code: BASE+47

com.borland.dx.dataset.DataSetException: Chain of 2 or more Exceptions occurred

at com.borland.dx.dataset.DataSetException.a(Unknown Source)

at com.borland.dx.dataset.DataSetException.throwExceptionChain(Unknown Source)

at com.borland.dx.sql.dataset.q.a(Unknown Source)

at com.borland.dx.sql.dataset.Database.openConnection(Unknown Source)

at com.borland.jbuilder.cmt.editors.sc.c(Unknown Source)

at com.borland.jbuilder.cmt.editors.sc.actionPerformed(Unknown Source)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)

at java.awt.Component.processMouseEvent(Component.java:3717)

at java.awt.Component.processEvent(Component.java:3546)

at java.awt.Container.processEvent(Container.java:1167)

at java.awt.Component.dispatchEventImpl(Component.java:2595)

at java.awt.Container.dispatchEventImpl(Container.java:1216)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)

at java.awt.Container.dispatchEventImpl(Container.java:1203)

at java.awt.Window.dispatchEventImpl(Window.java:918)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)

at java.awt.Dialog.show(Dialog.java:386)

at com.borland.jbuilder.designer.ButtonDialog.show(Unknown Source)

at java.awt.Component.show(Component.java:946)

at java.awt.Component.setVisible(Component.java:903)

at com.borland.jbuilder.designer.inspector.PropertyValueOutEditor.openEdit(Unknown Source)

at com.borland.jbuilder.designer.inspector.k.actionPerformed(Unknown Source)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)

at java.awt.Component.processMouseEvent(Component.java:3717)

at java.awt.Component.processEvent(Component.java:3546)

at java.awt.Container.processEvent(Container.java:1167)

at java.awt.Component.dispatchEventImpl(Component.java:2595)

at java.awt.Container.dispatchEventImpl(Container.java:1216)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)

at java.awt.Container.dispatchEventImpl(Container.java:1203)

at java.awt.Window.dispatchEventImpl(Window.java:918)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

Chained exception:

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial

at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:646)

at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)

at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:283)

at javax.naming.InitialContext.lookup(InitialContext.java:350)

at com.borland.dx.sql.dataset.q.a(Unknown Source)

at com.borland.dx.sql.dataset.Database.openConnection(Unknown Source)

at com.borland.jbuilder.cmt.editors.sc.c(Unknown Source)

at com.borland.jbuilder.cmt.editors.sc.actionPerformed(Unknown Source)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)

at java.awt.Component.processMouseEvent(Component.java:3717)

at java.awt.Component.processEvent(Component.java:3546)

at java.awt.Container.processEvent(Container.java:1167)

at java.awt.Component.dispatchEventImpl(Component.java:2595)

at java.awt.Container.dispatchEventImpl(Container.java:1216)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)

at java.awt.Container.dispatchEventImpl(Container.java:1203)

at java.awt.Window.dispatchEventImpl(Window.java:918)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)

at java.awt.Dialog.show(Dialog.java:386)

at com.borland.jbuilder.designer.ButtonDialog.show(Unknown Source)

at java.awt.Component.show(Component.java:946)

at java.awt.Component.setVisible(Component.java:903)

at com.borland.jbuilder.designer.inspector.PropertyValueOutEditor.openEdit(Unknown Source)

at com.borland.jbuilder.designer.inspector.k.actionPerformed(Unknown Source)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)

at java.awt.Component.processMouseEvent(Component.java:3717)

at java.awt.Component.processEvent(Component.java:3546)

at java.awt.Container.processEvent(Container.java:1167)

at java.awt.Component.dispatchEventImpl(Component.java:2595)

at java.awt.Container.dispatchEventImpl(Container.java:1216)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)

at java.awt.Container.dispatchEventImpl(Container.java:1203)

at java.awt.Window.dispatchEventImpl(Window.java:918)

at java.awt.Component.dispatchEvent(Component.java:2499)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

i don't know how the error comes and i don't know how to resolve it. help me. thanks.