diff --git a/src/main/java/io/vertx/core/impl/IsolatingClassLoader.java b/src/main/java/io/vertx/core/impl/IsolatingClassLoader.java
deleted file mode 100644
index e8420cf0e5d..00000000000
--- a/src/main/java/io/vertx/core/impl/IsolatingClassLoader.java
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License 2.0 which is available at
- * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
- * which is available at https://www.apache.org/licenses/LICENSE-2.0.
- *
- * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
- */
-
-package io.vertx.core.impl;
-
-import java.io.IOException;
-import java.net.URL;
-import java.net.URLClassLoader;
-import java.util.Collections;
-import java.util.Enumeration;
-import java.util.List;
-
-/**
- *
- * @author Tim Fox
- */
-public class IsolatingClassLoader extends URLClassLoader {
-
- private volatile boolean closed;
- private List isolatedClasses;
-
- public IsolatingClassLoader(URL[] urls, ClassLoader parent, List isolatedClasses) {
- super(urls, parent);
- this.isolatedClasses = isolatedClasses;
- }
-
- @Override
- protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
- synchronized (getClassLoadingLock(name)) {
- Class c = findLoadedClass(name);
- if (c == null) {
- if (isIsolatedClass(name)) {
- // We don't want to load Vert.x (or Vert.x dependency) classes from an isolating loader
- if (isVertxOrSystemClass(name)) {
- try {
- c = getParent().loadClass(name);
- } catch (ClassNotFoundException e) {
- // Fall through
- }
- }
- if (c == null) {
- // Try and load with this classloader
- try {
- c = findClass(name);
- } catch (ClassNotFoundException e) {
- // Now try with parent
- c = getParent().loadClass(name);
- }
- }
- if (resolve) {
- resolveClass(c);
- }
- } else {
- // Parent first
- c = super.loadClass(name, resolve);
- }
- }
- return c;
- }
- }
-
- private boolean isIsolatedClass(String name) {
- if (isolatedClasses != null) {
- for (String isolated : isolatedClasses) {
- if (isolated.endsWith(".*")) {
- String isolatedPackage = isolated.substring(0, isolated.length() - 1);
- String paramPackage = name.substring(0, name.lastIndexOf('.') + 1);
- if (paramPackage.startsWith(isolatedPackage)) {
- // Matching package
- return true;
- }
- } else if (isolated.equals(name)) {
- return true;
- }
- }
- }
- return false;
- }
-
-
- /**
- * {@inheritDoc}
- */
- @Override
- public URL getResource(String name) {
-
- // First check this classloader
- URL url = findResource(name);
-
- // Then try the parent if not found
- if (url == null) {
- url = super.getResource(name);
- }
-
- return url;
- }
-
- /**
- * {@inheritDoc}
- */
- @Override
- public Enumeration getResources(String name) throws IOException {
-
- // First get resources from this classloader
- List resources = Collections.list(findResources(name));
-
- // Then add resources from the parent
- if (getParent() != null) {
- Enumeration parentResources = getParent().getResources(name);
- if (parentResources.hasMoreElements()) {
- resources.addAll(Collections.list(parentResources));
- }
- }
-
- return Collections.enumeration(resources);
- }
-
- @Override
- public void close() throws IOException {
- closed = true;
- super.close();
- }
-
- public boolean isClosed() {
- return closed;
- }
-
- private boolean isVertxOrSystemClass(String name) {
- return
- name.startsWith("java.") ||
- name.startsWith("javax.") ||
- name.startsWith("sun.*") ||
- name.startsWith("com.sun.") ||
- name.startsWith("io.vertx.core") ||
- name.startsWith("io.netty.") ||
- name.startsWith("com.fasterxml.jackson");
- }
-}
diff --git a/src/test/java/io/vertx/test/verticles/ExtraCPVerticleAlreadyInParentLoader.java b/src/test/java/io/vertx/test/verticles/ExtraCPVerticleAlreadyInParentLoader.java
deleted file mode 100644
index 2023f85b129..00000000000
--- a/src/test/java/io/vertx/test/verticles/ExtraCPVerticleAlreadyInParentLoader.java
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License 2.0 which is available at
- * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
- * which is available at https://www.apache.org/licenses/LICENSE-2.0.
- *
- * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
- */
-
-package io.vertx.test.verticles;
-
-import io.vertx.core.AbstractVerticle;
-import io.vertx.core.impl.IsolatingClassLoader;
-import org.junit.Assert;
-
-/**
-* @author Julien Viet
-*/
-public class ExtraCPVerticleAlreadyInParentLoader extends AbstractVerticle {
- @Override
- public void start() throws Exception {
- IsolatingClassLoader cl = (IsolatingClassLoader) Thread.currentThread().getContextClassLoader();
- Class extraCPClass = cl.loadClass("MyVerticle");
- Assert.assertSame(extraCPClass.getClassLoader(), cl.getParent());
- }
-}
diff --git a/src/test/java/io/vertx/test/verticles/ExtraCPVerticleNotInParentLoader.java b/src/test/java/io/vertx/test/verticles/ExtraCPVerticleNotInParentLoader.java
deleted file mode 100644
index ac316c23e2c..00000000000
--- a/src/test/java/io/vertx/test/verticles/ExtraCPVerticleNotInParentLoader.java
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License 2.0 which is available at
- * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
- * which is available at https://www.apache.org/licenses/LICENSE-2.0.
- *
- * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
- */
-
-package io.vertx.test.verticles;
-
-import io.vertx.core.AbstractVerticle;
-import io.vertx.core.impl.IsolatingClassLoader;
-import org.junit.Assert;
-
-/**
-* @author Julien Viet
-*/
-public class ExtraCPVerticleNotInParentLoader extends AbstractVerticle {
-
- public static IsolatingClassLoader cl;
-
- @Override
- public void start() throws Exception {
- cl = (IsolatingClassLoader) Thread.currentThread().getContextClassLoader();
- Class extraCPClass = cl.loadClass("MyVerticle");
- Assert.assertSame(extraCPClass.getClassLoader(), cl);
- try {
- cl.getParent().loadClass("MyVerticle");
- Assert.fail("Parent classloader should not see this class");
- } catch (ClassNotFoundException expected) {
- //
- }
- }
-}