Question

I was currently reading the Head First Java book and went through the RMI chapter. I copied everything exactly as it is in the book, but I still have problems with this RMI thing.

This is the stack trace of the error.

java.rmi.ConnectIOException: Exception creating connection to: 192.168.0.110; nested exception is: 
    java.net.NoRouteToHostException: No route to host
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:632)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:340)
    at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
    at java.rmi.Naming.rebind(Naming.java:177)
    at MyRemoteImpl.main(MyRemoteImpl.java:15)
Caused by: java.net.NoRouteToHostException: No route to host
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at java.net.Socket.<init>(Socket.java:425)
    at java.net.Socket.<init>(Socket.java:208)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:146)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
    ... 6 more

I don’t really know what it means, so here it is.

If you need anything else, ask and be answered.

Thanks

Answer 1

It is not RMI problem. It signals that an error occurred while attempting to connect a socket to a remote address and port. Typically, the remote host cannot be reached because of an intervening firewall, or if an intermediate router is down.

See javadocs here

This has happened because you have copied the example word by word. You must replace 192.168.0.110 with a real, working host address.

This line in the trace:

at java.rmi.Naming.rebind(Naming.java:177)

shows it is the Naming.rebind() method which has failed to work with that IP address. Please check the server code and put the correct IP address there. If it is not in the code itself, please also look for it inside the configuration files.