spring injection is thread-safe?

[rockwells]

public class Test{ 
private First first; 
private Second second;  
public void setFirst(First first){ this.first = first; } 
public First getFirst(){  return first; } 
// same approach for second 
}

.
If I inject the instance through spring injection, is it thread-safe?
If not, how to make it thread-safe?
I googled and found contradict responses, not able to come to any conclusion.

This class will be used by concurrrent request (ie, multi thread).

Please suggest

-RW