can I use two ssh java lib in my java code?

Question

I am using j2ssh but due to some reasons (which we cant detect yet) we decided to switch to new ssh lib.

in j2ssh for 2 functions which are not giving expected result, we have to switch to new ssh (i have found vngx-jsch suitable)

but only for 2 functions, i need to do full rework of all ssh related function which i dont want to.
so I have following queries : -

can I use both lib ?
does it make sense ?
what if I keep j2ssh as it is and only for those 2 function I will load vngx-ssh?
is it possible?
how to do it ? any example ?

Sure, unless they both rely on competing versions of something else, but why? — user207421, Feb 24 '14 at 08:54
sry , but i dont understand ur answer. competing versions of something else means? j2ssh and vngx-jsch both are different java ssh libs both has similar functions to support sftp etc. — user1145280, Feb 24 '14 at 08:58

score 1 · Accepted Answer · answered Feb 24 '14 at 08:57

1

Yes, It's possible. you can use the fully qualified names to resolve the conflicts. for example:

let say there are 2 packages, com.package1.A and com.package2.B which exports the same function, func(). In your Java program, you can use any one of these by calling either

package com.package1;

public class A {
    public void func() {
       System.out.println("Inside A package's func ");
    }
}

And the second is:

package com.package2;

public class B {
    public void func() {
       System.out.println("Inside B package's func ");
    }
}

Then in a separate class you can use it like:

public class App {
    public static void main(String[] args) {
        com.package1.A.func();
        com.package2.B.func();
}
}

answered Feb 24 '14 at 08:57

Ankit Kumar

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thank you so much for answer, i understood the thing, one ques - i have included both jars now suppose only for 2 functions i have applied fully qualified names (in my case with vngx-jsch) is it sufficient or other place i have to mention with j2ssh ? – user1145280 Feb 24 '14 at 09:04
that should work. no need to change in other places. – Ankit Kumar Feb 24 '14 at 09:07
and also if you think the answer was useful and answered your question, vote "up" and mark it complete :) – Ankit Kumar Feb 24 '14 at 09:08
you should be able to see arrow mark just above the "0", clicking on that means that the answer was useful – Ankit Kumar Feb 24 '14 at 09:12

Stephen C · Answer 2 · 2014-02-24T09:07:46.303

1) can I use both lib ?

Probably yes. But you would need to try it to be sure.

The two things that would be contra-indicative would be:

the two libraries defining classes with the same fully qualified class names¹, or
needing to accept ssh connections in your application using the two libraries using the same port.

2) does it make sense ?

Possibly. But IMO, it makes more sense to either find and fix the root problem², or recode the application so that it does need the two missing functions.

3) what if I keep j2ssh as it is and only for those 2 function I will load vngx-ssh? is it possible?

It depends what you mean. If you make separate connections using the two libraries then that could work.

how to do it ? any example ?

It depends on the details of your problem. (But you are unlikely to find examples, because what you are doing sounds like an inferior approach ...)

^{1 - If this is a problem, it may be possible to work around the name clash using classloader magic, but you should only do that as a last resort.}

^{2 - This is one of the advantages of open source. If there is a problem in the application / library you are using, you can find it and fix it ... and then contribute your fix back to the community.}

What question are you talking about? – Stephen C Feb 24 '14 at 09:30 — Stephen C, Feb 24 '14 at 09:30

can I use two ssh java lib in my java code?

2 Answers2