Guava’s immutablelist Is the builder thread safe?

Guava’s ImmutableList. What is the thread security of builder? Javadoc doesn't say

Solution

Although guava invariant courses are thread safe, their builders are not For most applications, only one thread will interact with any particular instance of builder

Although there is no thread safety and usually no record is required, Javadoc may make sense for immutable collection builder People may be surprised that immutablelist is thread safe, while immutablelist Builder is not@ H_ 502_ 7@