Connect exception in LAN when network cord is pulled

[houstonbernie]

Hi,

we have the following setup. JBoss 3.0.5 and client on the same machine
(Win2000 or WinXP with Java 1.4.1x). The machine is connected to a LAN
(TCP/IP set to automatic, i.e. DHCP).

When we pull the network cord from the network adapter/card and try to
connect to JBoss with our client (look up an EJB via JNDI) we get the
following:

javax.naming.CommunicationException. Root exception is
java.rmi.ConnectIOExcept
ion: Exception creating connection to: 158.234.148.187; nested exception is:
java.net.NoRouteToHostException: No route to host: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:580)
at
sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185
)
at
sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:101)
at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:484)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:463)
at javax.naming.InitialContext.lookup(InitialContext.java:347)

The IP address contained in the stacktrace is the one my local machine had
last. When I reconnect the network cord, the lookup works fine again.
Remember, client and JBoss are on my same local machine.

Why does the NoRouteToHostException occur? Is this a special Java problem on
Windows when DHCP ist used? We use jnp://localhost:ourport to connect to the
naming service. Putting in 127.0.0.1 or the "real" IP instead yields the
same results.

Any insight into this would be extremely helpful.

[jonlee]

The problem is a Windows/Java network binding issue since Java needs to use the underlying OS to get to the network stack. Check the FAQ forum for the 127.0.0.1 question. It will give a range of prescriptions to try to solve the problem. The problem is not with the client but the JVM JBoss is running on is having trouble with the network binding.

[piazza]

Can anyone tell me where to find possible solutions for this problem? I have the same issue because we are deploying JBoss 4 on several hundred tablet PCs.

Thanks,

Tony Piazza

[darranl]

You say you have your JBoss installation installed on several hundred machines, are these installations accessed from remote machines or just from local clients running on the same machine?

[piazza]

To answer your question:

> Are these installations accessed from remote machines or just from local clients running on the same machine?

Our installations will only be accessed by local clients running on the same machine. We are using a mobile database (Sybase SQL Anywhere) that only needs a network connection when synchronizing with our main database (Oracle). This will only happen when users come into the office.

Thanks in advance for any help you can give me on this.

Tony Piazza