运行corba称许时候出现错误

[lihaifeng0412]

运行corba时候出现这样的错误,本人E太差了看不多大懂,我输入的是
appletviewer UpperClientApplet.html出现下面错误,高手帮忙!

E:\JavaChengXu\net\corba>appletviewer UpperClientApplet.html
2008-3-31 2:48:11 com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl
<init>
WARNING: "IOP00410201: (COMM_FAILURE) Connection failure: socketType: IIOP_CLEAR
_TEXT; hostname: 192.168.13.47; port: 900"
org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(O
RBUtilSystemException.java:2172)
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(O
RBUtilSystemException.java:2193)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:205)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:218)
        at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.create
Connection(SocketOrChannelContactInfoImpl.java:101)
        at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.begin
Request(CorbaClientRequestDispatcherImpl.java:152)
        at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(CorbaC
lientDelegateImpl.java:118)
        at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.invoke(Bootstrap
ResolverImpl.java:74)
        at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.resolve(Bootstra
pResolverImpl.java:107)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(ORBImpl.
java:1157)
        at chapter3.UpperClientApplet.init(UpperClientApplet.java:17)
        at sun.applet.AppletPanel.run(AppletPanel.java:374)
        at java.lang.Thread.run(Thread.java:595)
Caused by: java.net.ConnectException: Connection refused: connect
        at sun.nio.ch.Net.connect(Native Method)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:464)
        at java.nio.channels.SocketChannel.open(SocketChannel.java:146)
        at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket
(DefaultSocketFactoryImpl.java:60)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:188)
        ... 13 more
ERROR:org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(O
RBUtilSystemException.java:2172)
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(O
RBUtilSystemException.java:2193)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:205)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:218)
        at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.create
Connection(SocketOrChannelContactInfoImpl.java:101)
        at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.begin
Request(CorbaClientRequestDispatcherImpl.java:152)
        at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(CorbaC
lientDelegateImpl.java:118)
        at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.invoke(Bootstrap
ResolverImpl.java:74)
        at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.resolve(Bootstra
pResolverImpl.java:107)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Composit
eResolverImpl.java:22)
        at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(ORBImpl.
java:1157)
        at chapter3.UpperClientApplet.init(UpperClientApplet.java:17)
        at sun.applet.AppletPanel.run(AppletPanel.java:374)
        at java.lang.Thread.run(Thread.java:595)
Caused by: java.net.ConnectException: Connection refused: connect
        at sun.nio.ch.Net.connect(Native Method)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:464)
        at java.nio.channels.SocketChannel.open(SocketChannel.java:146)
        at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket
(DefaultSocketFactoryImpl.java:60)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(
SocketOrChannelConnectionImpl.java:188)
        ... 13 more
Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException: String is
 null
        at sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2638)
        at chapter3.UpperClientApplet.paint(UpperClientApplet.java:31)
        at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)
        at sun.awt.RepaintArea.paint(RepaintArea.java:224)
        at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254)
        at java.awt.Component.dispatchEventImpl(Component.java:4031)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException: String is
 null
        at sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2638)
        at chapter3.UpperClientApplet.paint(UpperClientApplet.java:31)
        at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)
        at sun.awt.RepaintArea.paint(RepaintArea.java:224)
        at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254)
        at java.awt.Component.dispatchEventImpl(Component.java:4031)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)