issue while ssh while using sshj in java

Question

I am trying to get a remote connection to server to execute some commands. I am new to this so started googling. After some search, I gave a try:

I am using sshj0.2.3.jar.

And here is how I implemented it:

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    final SSHClient ssh = new SSHClient();
    ssh.loadKnownHosts();
    ssh.connect("serverName");
    try{
        ssh.authPublickey("myUserId");
        final Session session = ssh.startSession();
        try{
            final Command cmd = session.exec("net send myMachineName Hello!!!");
            System.out.println(cmd.getOutputAsString());
            System.out.println("\n Exit Status: "+cmd.getExitStatus());
        }finally{
            session.close();
        }
        }finally{
            ssh.disconnect();
        }   
    }

}

But I get the folowing exception:

Exception in thread "main" java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory
at net.schmizz.sshj.DefaultConfig.<init>(DefaultConfig.java:92)
at net.schmizz.sshj.SSHClient.<init>(SSHClient.java:133)
at SSHTEST.main(SSHTEST.java:24)

Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory at java.net.URLClassLoader.findClass(URLClassLoader.java:419) at java.lang.ClassLoader.loadClass(ClassLoader.java:643) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:345) at java.lang.ClassLoader.loadClass(ClassLoader.java:609) .....

Do I need extra jars,How many extra jars do i need. AM I implementing correctly?. please help.

Thanks in advance.

Answer 1

From googling sshj, the first result reveals the answer:

Dependencies

Java 6+. slf4j is required. bouncycastle is highly recommended and required for using some of the crypto algorithms. jzlib is required for using zlib compression.

Answer 2

Yes, you need the jars for slf4j (see the 2-page manual)

slf4j comes with a API and then a pluggable implementation, but the proposed slf4j-simple should be just fine

Answer 3

slf4j is just a facade, and you need to supply a concrete implementation. If you don't really care about logging, stick in slf4j-nop-$(ver).jar that is present in the slf4j distribution.