Use a class literal instead of Class.forName.

My naive hope is that this uses the same class loader and that it differs only in not causing the class to be immediately initialized.

If we were to want to preserve the eager initialization, we could use Reflection.initialize. But initialization seems to mainly be a matter of some reflective lookups that are allowed to fail, so my guess is that it’s actually better to postpone that on the general principle of not slowing down startup time, especially on Android where reflection has at least historically been slow. (Perhaps even the direct use of the class literal improves performance, though we still need to look up its method reflectively later on, at least unless we use performance as a reason to make Finalizer implement some interface whose method we can call directly, as contemplated in https://github.com/google/guava/commit/9744861cb9b985bb832b81da91233b423b812276.)

RELNOTES=n/a PiperOrigin-RevId: 878788447

Guava: Google Core Libraries for Java

Guava is a set of core Java libraries from Google that includes new collection types (such as multimap and multiset), immutable collections, a graph library, and utilities for concurrency, I/O, hashing, primitives, strings, and more! It is widely used on most Java projects within Google, and widely used by many other companies as well.

Guava comes in two flavors:

The JRE flavor requires JDK 1.8 or higher.
If you need support for Android, use the Android flavor. You can find the Android Guava source in the android directory.

Adding Guava to your build

Guava’s Maven group ID is com.google.guava, and its artifact ID is guava. Guava provides two different “flavors”: one for use on a (Java 8+) JRE and one for use on Android or by any library that wants to be compatible with Android. These flavors are specified in the Maven version field as either 33.5.0-jre or 33.5.0-android. For more about depending on Guava, see using Guava in your build.

To add a dependency on Guava using Maven, use the following:

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>33.5.0-jre</version>
  <!-- or, for Android: -->
  <version>33.5.0-android</version>
</dependency>

To add a dependency using Gradle:

dependencies {
  // Pick one:

  // 1. Use Guava in your implementation only:
  implementation("com.google.guava:guava:33.5.0-jre")

  // 2. Use Guava types in your public API:
  api("com.google.guava:guava:33.5.0-jre")

  // 3. Android - Use Guava in your implementation only:
  implementation("com.google.guava:guava:33.5.0-android")

  // 4. Android - Use Guava types in your public API:
  api("com.google.guava:guava:33.5.0-android")
}

For more information on when to use api and when to use implementation, consult the Gradle documentation on API and implementation separation.

Snapshots and Documentation

Snapshots of Guava built from the master branch are available through Maven using version 999.0.0-HEAD-jre-SNAPSHOT, or 999.0.0-HEAD-android-SNAPSHOT for the Android flavor.

Snapshot API Javadoc as well as Snapshot API Diffs are also available.

Another easy way to get to the Javadoc is to open guava.dev/api. You can also jump right to a specific class by appending the class name to guava.dev. For example, guava.dev/ImmutableList!

Learn about Guava

Our users’ guide, Guava Explained
A nice collection of other helpful links

IMPORTANT WARNINGS

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, at any time. 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. If your code is a library, we strongly recommend using the Guava Beta Checker to ensure that you do not use any @Beta APIs!
APIs without @Beta will remain binary-compatible for the indefinite future. (Previously, we sometimes removed such APIs after a deprecation period. The last release to remove non-@Beta APIs was Guava 21.0.) Even @Deprecated APIs will remain (again, unless they are @Beta). We have no plans to start removing things again, but officially, we’re leaving our options open in case of surprises (like, say, a serious security problem).
Guava has one dependency that is needed for linkage at runtime: com.google.guava:failureaccess:1.0.3. It also has some annotation-only dependencies, which we discuss in more detail at that link.
Serialized forms of ALL objects are subject to change unless noted otherwise. Do not persist these and assume they can be read by a future version of the library.
Our classes are not designed to protect against a malicious caller. You should not use them for communication between trusted and untrusted code.
For the mainline flavor, we test the libraries using OpenJDK 8, 11, and 17 on Linux, with some additional testing on newer JDKs and on Windows. Some features, especially in com.google.common.io, may not work correctly in non-Linux environments. For the Android flavor, our unit tests also run on API level 23 (Marshmallow).

Guava: Google Core Libraries for Java

Adding Guava to your build

Snapshots and Documentation

Learn about Guava

Links

IMPORTANT WARNINGS