diff --git a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/async/JavaVersion.java b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/async/JavaVersion.java
deleted file mode 100644
index 2c5208ad7..000000000
--- a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/async/JavaVersion.java
+++ /dev/null
@@ -1,172 +0,0 @@
-/*
- * Copyright 2013-2014 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.cloud.sleuth.instrument.async;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * TAKEN FROM GRADLE
- * (https://github.com/gradle/gradle/blob/master/subprojects/base-services/src/main/java/org/gradle/api/JavaVersion.java)
- *
- * An enumeration of Java versions. Before 9:
- * http://www.oracle.com/technetwork/java/javase/versioning-naming-139433.html 9+:
- * http://openjdk.java.net/jeps/223
- */
-enum JavaVersion {
-
-	VERSION_1_1, VERSION_1_2, VERSION_1_3, VERSION_1_4, VERSION_1_5, VERSION_1_6, VERSION_1_7, VERSION_1_8, VERSION_1_9, VERSION_1_10,
-	/**
-	 * Java 11 major version.
-	 *
-	 * @since 4.7
-	 */
-	VERSION_11,
-
-	/**
-	 * Java 12 major version.
-	 *
-	 * @since 5.0
-	 */
-	VERSION_12,
-
-	/**
-	 * Higher version of Java.
-	 * @since 4.7
-	 */
-	VERSION_HIGHER;
-	// Since Java 9, version should be X instead of 1.X
-	// However, to keep backward compatibility, we change from 11
-	private static final int FIRST_MAJOR_VERSION_ORDINAL = 10;
-
-	private static JavaVersion currentJavaVersion;
-
-	private final String versionName;
-
-	JavaVersion() {
-		this.versionName = ordinal() >= FIRST_MAJOR_VERSION_ORDINAL ? getMajorVersion()
-				: "1." + getMajorVersion();
-	}
-
-	/**
-	 * Converts the given object into a {@code JavaVersion}.
-	 * @param value An object whose toString() value is to be converted. May be null.
-	 * @return The version, or null if the provided value is null.
-	 * @throws IllegalArgumentException when the provided value cannot be converted.
-	 */
-	public static JavaVersion toVersion(Object value) throws IllegalArgumentException {
-		if (value == null) {
-			return null;
-		}
-		if (value instanceof JavaVersion) {
-			return (JavaVersion) value;
-		}
-		String name = value.toString();
-		int firstNonVersionCharIndex = findFirstNonVersionCharIndex(name);
-		String[] versionStrings = name.substring(0, firstNonVersionCharIndex)
-				.split("\\.");
-		List<Integer> versions = convertToNumber(name, versionStrings);
-		if (isLegacyVersion(versions)) {
-			assertTrue(name, versions.get(1) > 0);
-			return getVersionForMajor(versions.get(1));
-		}
-		else {
-			return getVersionForMajor(versions.get(0));
-		}
-	}
-
-	/**
-	 * Returns the version of the current JVM.
-	 * @return The version of the current JVM.
-	 */
-	public static JavaVersion current() {
-		if (currentJavaVersion == null) {
-			currentJavaVersion = toVersion(System.getProperty("java.version"));
-		}
-		return currentJavaVersion;
-	}
-
-	private static JavaVersion getVersionForMajor(int major) {
-		return major >= values().length ? JavaVersion.VERSION_HIGHER
-				: values()[major - 1];
-	}
-
-	private static void assertTrue(String value, boolean condition) {
-		if (!condition) {
-			throw new IllegalArgumentException(
-					"Could not determine java version from '" + value + "'.");
-		}
-	}
-
-	private static boolean isLegacyVersion(List<Integer> versions) {
-		return 1 == versions.get(0) && versions.size() > 1;
-	}
-
-	private static List<Integer> convertToNumber(String value, String[] versionStrs) {
-		List<Integer> result = new ArrayList<Integer>();
-		for (String s : versionStrs) {
-			assertTrue(value, !isNumberStartingWithZero(s));
-			try {
-				result.add(Integer.parseInt(s));
-			}
-			catch (NumberFormatException e) {
-				assertTrue(value, false);
-			}
-		}
-		assertTrue(value, !result.isEmpty() && result.get(0) > 0);
-		return result;
-	}
-
-	private static boolean isNumberStartingWithZero(String number) {
-		return number.length() > 1 && number.startsWith("0");
-	}
-
-	private static int findFirstNonVersionCharIndex(String s) {
-		assertTrue(s, s.length() != 0);
-
-		for (int i = 0; i < s.length(); ++i) {
-			if (!isDigitOrPeriod(s.charAt(i))) {
-				assertTrue(s, i != 0);
-				return i;
-			}
-		}
-
-		return s.length();
-	}
-
-	private static boolean isDigitOrPeriod(char c) {
-		return (c >= '0' && c <= '9') || c == '.';
-	}
-
-	/**
-	 * Returns if the version is Java 11 compatible.
-	 *
-	 * @since 4.7
-	 */
-	public boolean isJava11Compatible() {
-		return this.compareTo(VERSION_11) >= 0;
-	}
-
-	@Override
-	public String toString() {
-		return this.versionName;
-	}
-
-	public String getMajorVersion() {
-		return String.valueOf(ordinal() + 1);
-	}
-
-}
\ No newline at end of file