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.

score 83 · Accepted Answer · edited Aug 15 '17 at 13:44

83

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.

edited Aug 15 '17 at 13:44

Sled

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answered Sep 22 '12 at 02:52

Erre Efe

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And so is the Java8 one as well. See https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html – muttonUp Mar 04 '15 at 20:13

score 13 · Answer 2 · answered Sep 22 '12 at 02:53

13

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

answered Sep 22 '12 at 02:53

Mark Elliot

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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). – sleske Dec 14 '15 at 14:21

score 3 · Answer 3 · answered Jun 28 '16 at 07:06

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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

answered Jun 28 '16 at 07:06

Dariusz

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Is Joda-Time DateTimeFormatter class thread safe?

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