Upgrade to Hamcrest 2.1, switch to hamcrest artifact from -core and -library

Closes gh-15555

spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml

@@ -497,6 +497,12 @@
 			<groupId>com.squareup.okhttp3</groupId>
 			<artifactId>mockwebserver</artifactId>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>com.jayway.jsonpath</groupId>

spring-boot-project/spring-boot-autoconfigure/pom.xml

@@ -855,6 +855,12 @@
 			<groupId>com.squareup.okhttp3</groupId>
 			<artifactId>mockwebserver</artifactId>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>com.sun.xml.messaging.saaj</groupId>

spring-boot-project/spring-boot-cli/pom.xml

@@ -153,6 +153,12 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 	</dependencies>
 	<build>

spring-boot-project/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/install/GroovyGrabDependencyResolverTests.java

@@ -121,9 +121,9 @@ public class GroovyGrabDependencyResolverTests {
 	public void resolveMultipleArtifacts() throws Exception {
 		List<File> resolved = this.resolver.resolve(Arrays.asList("junit:junit:4.11",
 				"commons-logging:commons-logging:1.1.3"));
-		assertThat(resolved).hasSize(3);
+		assertThat(resolved).hasSize(4);
 		assertThat(getNames(resolved)).containsOnly("junit-4.11.jar",
-				"commons-logging-1.1.3.jar", "hamcrest-core-1.3.jar");
+				"commons-logging-1.1.3.jar", "hamcrest-core-2.1.jar", "hamcrest-2.1.jar");
 	}
 
 	public Set<String> getNames(Collection<File> files) {

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -66,7 +66,7 @@
 		<groovy.version>2.5.7</groovy.version>
 		<gson.version>2.8.5</gson.version>
 		<h2.version>1.4.199</h2.version>
-		<hamcrest.version>1.3</hamcrest.version>
+		<hamcrest.version>2.1</hamcrest.version>
 		<hazelcast.version>3.12</hazelcast.version>
 		<hazelcast-hibernate5.version>1.3.2</hazelcast-hibernate5.version>
 		<hibernate.version>5.4.2.Final</hibernate.version>
@@ -2245,6 +2245,11 @@
 				<scope>import</scope>
 				<type>pom</type>
 			</dependency>
+			<dependency>
+				<groupId>org.hamcrest</groupId>
+				<artifactId>hamcrest</artifactId>
+				<version>${hamcrest.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.hamcrest</groupId>
 				<artifactId>hamcrest-core</artifactId>

spring-boot-project/spring-boot-docs/pom.xml

@@ -88,6 +88,14 @@
 					<groupId>javax.activation</groupId>
 					<artifactId>activation</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-library</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 		<dependency>
@@ -401,6 +409,12 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<optional>true</optional>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>
@@ -660,7 +674,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 			<optional>true</optional>
 		</dependency>
 		<dependency>

spring-boot-project/spring-boot-parent/pom.xml

@@ -246,6 +246,12 @@
 			<groupId>org.junit.vintage</groupId>
 			<artifactId>junit-vintage-engine</artifactId>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>
@@ -264,7 +270,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 			<scope>test</scope>
 		</dependency>
 		<dependency>
@@ -583,6 +589,7 @@
 								<bannedDependencies>
 									<excludes>
 										<exclude>com.zaxxer:HikariCP-*</exclude>
+										<exclude>org.hamcrest:hamcrest-*</exclude>
 										<exclude>javax.*:*:*</exclude>
 									</excludes>
 									<includes>

spring-boot-project/spring-boot-starters/spring-boot-starter-test/pom.xml

@@ -42,10 +42,22 @@
 		<dependency>
 			<groupId>org.junit.vintage</groupId>
 			<artifactId>junit-vintage-engine</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>
@@ -57,11 +69,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-core</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>

spring-boot-project/spring-boot-test-autoconfigure/pom.xml

@@ -53,6 +53,14 @@
 					<groupId>javax.activation</groupId>
 					<artifactId>activation</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-library</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 		<dependency>
@@ -367,6 +375,10 @@
 					<groupId>javax.xml.bind</groupId>
 					<artifactId>jaxb-api</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 	</dependencies>

spring-boot-project/spring-boot-test/pom.xml

@@ -54,6 +54,12 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<optional>true</optional>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
@@ -67,12 +73,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-core</artifactId>
-			<optional>true</optional>
-		</dependency>
-		<dependency>
-			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 			<optional>true</optional>
 		</dependency>
 		<dependency>

spring-boot-project/spring-boot-tools/spring-boot-test-support/pom.xml

@@ -49,11 +49,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-core</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.assertj</groupId>
@@ -118,6 +114,12 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<scope>provided</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<!-- Test -->
 		<dependency>

spring-boot-project/spring-boot/pom.xml

@@ -115,6 +115,12 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<optional>true</optional>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hamcrest</groupId>
+					<artifactId>hamcrest-core</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.commons</groupId>
@@ -210,7 +216,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.hamcrest</groupId>
-			<artifactId>hamcrest-library</artifactId>
+			<artifactId>hamcrest</artifactId>
 			<optional>true</optional>
 		</dependency>
 		<dependency>