[I] sshd-sftp on the class path leaves sshd-SshClient[*]-timer-thread-1 running [mina-sshd]

[via GitHub]

veita opened a new issue, #721:
URL: https://github.com/apache/mina-sshd/issues/721

   ### Version
   
   2.15.0
   
   ### Bug description
   
   When sshd-sftp it on the class path a `sshd-SshClient[*]-timer-thread-1` is 
created and left running as a side effect of various code execution, even 
though SFTP is never used during the life time of the JVM.
   
   An example is the execution of Groovy code in the JVM. The problem can be 
reproduced with the following code:
   
   ```java
   import java.nio.file.*;
   
   public void test()
        throws IOException
   {
        FileSystems.newFileSystem(Paths.get("foo://bar"));
   
        return; // place breakpoint here to observe the created thread
   }
   ```
   
   
   ### Actual behavior
   
   A thread named `sshd-SshClient[*]-timer-thread-1` is being created as a side 
effect of unrelated code execution.
   
   ### Expected behavior
   
   The thread should only be created if it is actually needed.
   
   ### Relevant log output
   
   ```Shell
   
   ```
   
   ### Other information
   
   _No response_


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