关于rmi的问题

我在Thinking in java中的rmi例子中，
已经做到了这些：
1。创建了接口PerfectTimeI.java,和PerfectTime.java，并且编译成了.class文件
2。用rmic已经创建了stub和skel的.class文件。
3。已经启动了rmiregistry（用默认端口1099）
但是在执行PerfectTime时在Naming.bind中出现了下面的问题：
抛出了java.security.AccessControlException异常，堆栈如下：
java.security.AccessControlException: access denied (java.net.SocketPermission e
cho's resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkConnect(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getByName(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown S
ource)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
at sun.rmi.server.UnicastRef.newCall(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at java.rmi.Naming.bind(Unknown Source)
at myrmi.ptime.PerfectTime.main(PerfectTime.java:22)
哪位大侠知道是什么原因，并且如何改。
对了，我在bind时只是使用了Naming.bind("PerfectTime", pt)；应该是默认的localhost,我也使用过"//localhost/PerfectTime",和“//computername/PerfectTime”都会出现同样问题。