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JVM AOT compiler currently generating JavaScript, C++, Haxe, with initial focus on Kotlin and games.
There is a newer version: 0.6.8
/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * 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 java.lang;

import com.jtransc.JTranscSystem;
import com.jtransc.annotation.JTranscAddLibraries;
import com.jtransc.annotation.JTranscMethodBody;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Vector;

public abstract class ClassLoader {

	private ArrayList nativeLibs = new ArrayList<>();

	public static class NativeLib {
		long handle;
		String name;

		NativeLib(long handle, String name) {
			this.handle = handle;
			this.name = name;
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) return true;
			if (o == null || getClass() != o.getClass()) return false;

			NativeLib nativeLib = (NativeLib) o;

			return handle == nativeLib.handle;

		}

		@Override
		public int hashCode() {
			return (int) (handle ^ (handle >>> 32));
		}
	}

	public ArrayList getNativeLibs() {
		return nativeLibs;
	}

	private ClassLoader parent;

	protected ClassLoader(ClassLoader parent) {
		this.parent = parent;
	}

	protected ClassLoader() {
		this(null);
	}

	public final ClassLoader getParent() {
		return parent;
	}

	public static ClassLoader getSystemClassLoader() {
		return _ClassInternalUtils.getSystemClassLoader();
	}

	public Class loadClass(String name) throws ClassNotFoundException {
		//JTranscConsole.error("ClassLoader.loadClass('" + name + "');");
		//JTranscConsole.log("ClassLoader.loadClass('" + name + "');");
		return Class.forName(name);
	}

	protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
		return loadClass(name);
	}

	protected Object getClassLoadingLock(String className) {
		return this;
	}

	protected Class findClass(String name) throws ClassNotFoundException {
		return loadClass(name);
	}

	@Deprecated
	native protected final Class defineClass(byte[] b, int off, int len) throws ClassFormatError;

	native protected final Class defineClass(String name, byte[] b, int off, int len) throws ClassFormatError;

	//native protected final Class defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) throws ClassFormatError;
	//native protected final Class defineClass(String name, java.nio.ByteBuffer b, ProtectionDomain protectionDomain) throws ClassFormatError;
	native protected final void resolveClass(Class c);

	protected final Class findSystemClass(String name) throws ClassNotFoundException {
		return loadClass(name);
	}

	protected final Class findLoadedClass(String name) {
		try {
			return loadClass(name);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			return null;
		}
	}

	protected final void setSigners(Class c, Object[] signers) {
	}

	public URL getResource(String name) {
		try {
			return new URL("file:///" + name);
		} catch (MalformedURLException e) {
			throw new RuntimeException(e);
		}
	}

	public Enumeration getResources(String name) throws IOException {
		return new Vector<>(Arrays.asList(getResource(name))).elements();
	}

	native protected URL findResource(String name);

	native protected Enumeration findResources(String name) throws IOException;

	native protected static boolean registerAsParallelCapable();

	native public static URL getSystemResource(String name);

	native public static Enumeration getSystemResources(String name) throws IOException;

	public InputStream getResourceAsStream(String name) {
		try {
			return new FileInputStream(name);
		} catch (FileNotFoundException e) {
			return null;
		}
	}

	native public static InputStream getSystemResourceAsStream(String name);

	native protected Package definePackage(String name, String specTitle, String specVersion, String specVendor, String implTitle, String implVersion, String implVendor, URL sealBase) throws IllegalArgumentException;

	native protected Package getPackage(String name);

	native protected Package[] getPackages();

	native protected String findLibrary(String libname);

	native public void setDefaultAssertionStatus(boolean enabled);

	native public void setPackageAssertionStatus(String packageName, boolean enabled);

	native public void setClassAssertionStatus(String className, boolean enabled);

	native public void clearAssertionStatus();

	void loadLibrary(Class fromClass, String name, boolean isAbsolute) {
		if (JTranscSystem.isCpp()) {
			NativeLib nativeLib = new NativeLib(loadLibrarayCpp(name), name);
			if (!nativeLibs.contains(nativeLib)) {
				nativeLibs.add(nativeLib);
			} else {
				unLoadLibrarayCpp(nativeLib.handle);
			}
		} else {
			throw new UnsupportedOperationException("Loading dynamic libs is only supported by the cpp target!");
		}
	}

	@JTranscMethodBody(target = "cpp", value = "return ptr_to_jlong(DYN::openDynamicLib(N::istr3(p0).c_str()));")
	private static long loadLibrarayCpp(String filename) {
		return 0L;
	}

	@JTranscMethodBody(target = "cpp", value = "DYN::closeDynamicLib(jlong_to_ptr(p0));")
	private static void unLoadLibrarayCpp(long handle) {
	}
}