Is Joda-Time DateTimeFormatter class thread safe?

Question

Is the Joda-Time DateTimeFormatter class thread safe? Once I get an instance from DateTimeFormat.forPattern, can its various parse methods be called by multiple threads? DateTimeFormatter's Javadocs makes no mention of thread safety.

Goeselt

Answer 1

Yes, it is:

DateTimeFormat is thread-safe and immutable, and the formatters it returns are as well.

and so is the Java 8 version

Implementation Requirements: This class is immutable and thread-safe.

Herdic

And so is the Java8 one as well. See docs.oracle.com/javase/8/docs/api/java/time/format/… – Biased

Answer 2

A quick look at the code shows there isn't any mutable shared state in DateTimeFormatter, which would make it thread safe.

Oared

Nitpick: A quick look at the code does not necessarily show how the code will be changed in the next point release. It's always better to have an explicit guarantee in the documented API (of course, additionally checking the code cannot hurt). – Ingra

Answer 3

Found this question on top of google's answers when checking for Java's java.time.format.DateTimeFormatter thread safety

Java's own DateTimeFormatter is also thread-safe, as the documentation states:

This class is immutable and thread-safe

Ohalloran