最近在自学Eclipse，把书上的源码导入后，尝试运行却出现了一下错误，请问怎么能够解决
控制台错误信息如下：
Activation.main: 警告： sun.rmi.activation.execPolicy 系统
属性未被指定且 ExecPermissions/ExecOptionPermissions
均未被授权。随后的激活尝试失败，原因是对
ExecPermission/ExecOptionPermission 的权限检查失败。 有关如何
配置 rmid 安全性的文档说明，请参阅：
http://java.sun.com/j2se/1.4/docs/tooldocs/solaris/rmid.html
http://java.sun.com/j2se/1.4/docs/tooldocs/win32/rmid.html
Activation.main: 出现异常：Port already in use: 1098; nested exception is:
java.net.BindException: Address already in use: JVM_Bind
java.rmi.server.ExportException: Port already in use: 1098; nested exception is:
java.net.BindException: Address already in use: JVM_Bind
at sun.rmi.transport.tcp.TCPTransport.listen(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.exportObject(Unknown Source)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(Unknown Source)
at sun.rmi.transport.LiveRef.exportObject(Unknown Source)
at sun.rmi.server.UnicastServerRef.exportObject(Unknown Source)
at sun.rmi.registry.RegistryImpl.setup(Unknown Source)
at sun.rmi.registry.RegistryImpl. <init> (Unknown Source)
at java.rmi.registry.LocateRegistry.createRegistry(Unknown Source)
at sun.rmi.server.Activation.main(Unknown Source)
Caused by: java.net.BindException: Address already in use: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket. <init> (Unknown Source)
at java.net.ServerSocket. <init> (Unknown Source)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(Unknown Source)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(Unknown Source)
at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(Unknown Source)
... 9 more
------解决方案--------------------
是由于端口在使用的原因，出现这个问题可能是你没有正常关闭服务器，解决的办法是在任务管理器中把javaw.exe进程（可能有多个这样的进程）关掉，重启服务器就可以了