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host key issue via java

 
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Old 07-22-2010
host key issue via java
Hi,
I am encountering below mentioned exception when I execute my Java program that is supposed to SFTP the file from one server over to another.

Can you please tell me some pointers to resolve this issue?


Exception
Code:
HostName- 10.1.1.1 ; userName- bmsftp 
log4j:WARN No appenders could be found for logger (com.sshtools.j2ssh.transport.publickey.SshKeyPairFactory). 
log4j:WARN Please initialize the log4j system properly. 
The host 10.1.1.1  is currently unknown to the system 
The host key fingerprint is: 1024: a d3 9d 50 c9 97 6e f3 54 ef 8e ce 26 cd 54 78 
Do you want to allow this host key? [Yes|No|Always]: java.lang.NullPointerException 
        at com.sshtools.j2ssh.transport.ConsoleKnownHostsKeyVerification.getResponse(Unknown Source) 
        at com.sshtools.j2ssh.transport.ConsoleKnownHostsKeyVerification.onUnknownHost(Unknown Source) 
        at com.sshtools.j2ssh.transport.AbstractKnownHostsKeyVerification.validateHost(Unknown Source) 
        at com.sshtools.j2ssh.transport.AbstractKnownHostsKeyVerification.verifyHost(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolClient.verifyHostKey(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolClient.performKeyExchange(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolCommon.beginKeyExchange(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolCommon.onMsgKexInit(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolCommon.startBinaryPacketProtocol(Unknown Source) 
        at com.sshtools.j2ssh.transport.TransportProtocolCommon.run(Unknown Source) 
        at java.lang.Thread.run(Thread.java:534)

 
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