Java Hamcrest Home

Hamcrest Distributables


Hamcrest consists of different jars matching the different needs of applications. This document describes these distributables and the functionality contained in each of them.

Table of Contents

The Java Hamcrest Jars


This is the core API to be used by third-party framework providers. This includes a foundation set of matcher implementations for common operations. This API is stable and will rarely change. You will need this library as a minimum.


The library of Matcher implementations which are based on the core functionality in hamcrest-core.jar.


Provides integration between Hamcrest and other testing tools, such as jMock and EasyMock. Uses hamcrest-core.jar and hamcrest-library.jar.


A tool to allow many Matcher implementations to be combined into a single class with static methods returning the different matchers so users don’t have to remember many classes/packages to import. Generates code. This library is only used internally at compile time. It is not necessary for the use of any of the other hamcrest libraries at runtime.


One jar containing all classes of all the other jars.

Adding Hamcrest to your Project

The dependencies of the jars (hamcrest-integration uses hamcrest-library which uses hamcrest-core) is represented by the Maven dependency mechanism. There is no hamcrest-all library in the Maven repo prior to version 1.3. Just use hamcrest-integration which references all the other hamcrest libraries.


Add "org.hamcrest:hamcrest-library:1.3" to the dependencies section of your build.gradle, for example:

apply plugin: 'java'

dependencies {
    testImplementation 'org.hamcrest:hamcrest-library:1.3'

Note: older versions of Gradle use the testCompile configuration instead of the testImplementation configuration.


Add the following dependency declaration to your pom.xml:



You can download the jars directly from Maven Central. At a minimum, you will need hamcrest-core.jar, though most people will also use hamcrest-library.jar too. If you want to integrate Hamcrest Matchers with other test tools, such as jMock or EasyMock, download hamcrest-integration.jar, too.

You can find the jars by searching Maven Central for groupId org.hamcrest using the following link:

Maven central has some extra artifacts called java-hamcrest and hamcrest-java, with a version of Please do not use these, as they are an aborted effort at repackaging the different jars.

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