CODEWITHSUNDEEP
javasocketsexception
Rosh
Rosh

Reputation: 731

Network is unreachable?

I want to run a cyc (opencyc) Java class, but when I run this class I got an error mentioning that the network is unreachable. I am working on NetBeans 7.0 and opencyc 2.0 win 32 version. I am using localhost (127.0.0.1) to test. The error is below. 

Network is unreachable: connect
java.net.SocketException: Network is unreachable: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at java.net.Socket.<init>(Socket.java:366)
at java.net.Socket.<init>(Socket.java:180)
at org.opencyc.api.CycConnection.initializeApiConnections(CycConnection.java:223)
at org.opencyc.api.CycConnection.<init>(CycConnection.java:199)
at org.opencyc.api.CycAccess.<init>(CycAccess.java:121)
at org.opencyc.api.CycAccess.<init>(CycAccess.java:61)
at org.opencyc.api.ApiDemo.<init>(ApiDemo.java:50)
at org.opencyc.api.ApiDemo.main(ApiDemo.java:147)
Exception in thread "main" java.lang.NullPointerException
at org.opencyc.api.ApiDemo.<init>(ApiDemo.java:56)
at org.opencyc.api.ApiDemo.main(ApiDemo.java:147)
Interruption while waiting Cyc connection establishment, closing sockets
Exception in thread "Thread-1" java.lang.NullPointerException
at org.opencyc.api.CycConnection$TaskProcessorBinaryResponseHandler.access$002(CycConnection.java:988)
at org.opencyc.api.CycConnection.close(CycConnection.java:268)
at org.opencyc.api.CycConnection$ConnectionTimer.run(CycConnection.java:1351)

Why is this happening? How can I connect to the cyc?

Upvotes: 0

Views: 9264

Answers (3)

jocull
jocull

Reputation: 21155

A dev on my team encountered this today, only their machine is seeing this issue out of many on the team.

Through much debugging we eventually discovered that localhost would not resolve for some reason. It would work in some JVM contexts and fail in others so it was completely inconsistent.

Replacing localhost with explicitly 127.0.0.1 fixed the issue. My hunch is that something was different with a local network and IPv6 perhaps, but we still don't really understand why this is the fix.

Upvotes: 0

David Baxter
David Baxter

Reputation: 16

If you have the same version I have, it's trying to establish a connection to a Cyc image with the hostname and port defined by

CycConnection.DEFAULT_HOSTNAME
CycConnection.DEFAULT_BASE_PORT

You can find the proper values to use by evaluating the following in your Cyc image:

(get-machine-name)
*BASE-TCP-PORT*

Hope this works for you.

Upvotes: 0

Peter Lawrey
Peter Lawrey

Reputation: 533820

The problem is that your network settings do not allow you to connect to this machine. This is not a Java problem as such.

try

ping {hostname}

until this works, there is nothing you can do in java to work around this.

Upvotes: 3

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