The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.

The latest release is 16.0.1, released February 4, 2014.

Start using Guava

You can download a JAR at:

• guava-16.0.1.jar
• guava-gwt-16.0.1.jar (for GWT users)

Guava is also available in Maven Central under the following identifiers:

• com.google.guava:guava
• com.google.guava:guava-gwt (for GWT users)

Learn more about how to UseGuavaInYourBuild.

Please see the 16.0 release notes for more details about this release.

Learn about Guava

• Our users' guide, GuavaExplained
• Browse API docs for the most recent release
• Browse API diffs for the most recent release
• Presentation slides focusing on base, primitives, and io
• Presentation slides focusing on cache
• Presentation slides focusing on util.concurrent
• A nice collection of other helpful links

How to communicate with us (and each other)

To stay informed and get "tip of the week"-style posts, follow +Google Guava on Google+.

To just stay informed, period, about important news that every Guava user needs to know, subscribe to guava-announce. It is very low-traffic.

To report a defect or request a feature, click the Issues tab above and enter a new issue.

To get help on a specific question or problem, post a question to Stack Overflow with the tag "guava". We monitor these questions using this RSS feed.)

Keep an eye on project updates using any of these Project Feeds. (The "Updates" feed is an aggregation of all the others.) You can view our code changes as they happen, and comment on them using the code-review tool.

We have a read-only mailing list consisting of email notifications of issue tracker activity, which can be easier to follow in a threaded manner than the project feed.

For general discussion that doesn't fit neatly into any of these categories, join our discussion group guava-discuss.

Important Warnings

Guava contains a strictly compatible superset of the old, deprecated Google Collections Library. You should not use that library anymore.

APIs marked with the @Beta annotation at the class or method level are subject to change. They can be modified in any way, or even removed, in any major release. If your code is a library itself (i.e. it is used on the CLASSPATH of users outside your own control), you should not use beta APIs, unless you repackage them (e.g. using ProGuard). Here is a current list of all the beta APIs.

Serialized forms of ALL objects are subject to change. Do not persist these and assume they can be read by a future version of the library.

Deprecated non-beta APIs will be removed eighteen months after the release in which they are first deprecated. You must fix your usages before this time. If you don't, any manner of breakage might result (you are not guaranteed a compilation error).