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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