Trying to fix the build

pom.xml

@@ -179,6 +179,18 @@
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework</groupId>
+				<artifactId>spring-core</artifactId>
+				<version>${spring.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework</groupId>
+				<artifactId>spring-framework-bom</artifactId>
+				<version>${spring.version}</version>
+				<scope>import</scope>
+				<type>pom</type>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-dependencies</artifactId>
@@ -255,6 +267,7 @@
 		<reactor.version>Bismuth-BUILD-SNAPSHOT</reactor.version>
 		<!-- To make Reactor work -->
 		<spring-boot.version>2.0.0.BUILD-SNAPSHOT</spring-boot.version>
+		<spring.version>5.0.0.BUILD-SNAPSHOT</spring.version>
 	</properties>
 
 	<profiles>

spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/reactor/TraceReactorAutoConfiguration.java

@@ -1,8 +1,9 @@
 package org.springframework.cloud.sleuth.instrument.reactor;
 
-import javax.annotation.PostConstruct;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.function.Supplier;
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
@@ -16,7 +17,6 @@ import org.springframework.cloud.sleuth.Tracer;
 import org.springframework.cloud.sleuth.instrument.async.TraceableScheduledExecutorService;
 import org.springframework.cloud.sleuth.instrument.web.TraceWebFluxAutoConfiguration;
 import org.springframework.context.annotation.Configuration;
-
 import reactor.core.publisher.Hooks;
 import reactor.core.publisher.Mono;
 import reactor.core.scheduler.Schedulers;
@@ -57,5 +57,11 @@ public class TraceReactorAutoConfiguration {
 				}
 			});
 		}
+
+		@PreDestroy
+		public void cleanupHooks() {
+			Hooks.resetOnLastOperator();
+			Schedulers.resetFactory();
+		}
 	}
 }

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/reactor/SpanSubscriberTests.java

@@ -5,8 +5,10 @@ import java.util.concurrent.atomic.AtomicReference;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.awaitility.Awaitility;
+import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.reactivestreams.Publisher;
@@ -18,6 +20,7 @@ import org.springframework.cloud.sleuth.Sampler;
 import org.springframework.cloud.sleuth.Span;
 import org.springframework.cloud.sleuth.Tracer;
 import org.springframework.cloud.sleuth.sampler.AlwaysSampler;
+import org.springframework.cloud.sleuth.trace.TestSpanContextHolder;
 import org.springframework.cloud.sleuth.util.ExceptionUtils;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;