Rust isn't inherently thread-safe; not like in the way Java is thread-safe because of how the JVM's memory model is defined.

Rust makes it really difficult to share mutable data. But once you do that, such as by smuggling a pointer _through_ an unsafe block, all bets are off, even for code outside an unsafe block.

Also, as with Java there will always be bugs in the compiler and runtime. Rust programs were susceptible to StackClash just as much as C applications.

No matter what language you use, if you minimize shared mutable data you'll minimize thread-safety issues.