package common.util.reflection; import java.net.URL; import java.net.URLClassLoader; /* * 커스텀 URLClassLoder * * WAS(톰캣)에서 URLClassLoder로 작동시 외부 라이브러리에 있는 jar파일을 읽지 못함 * 외부 라이브러리 class들을 먼저 읽기 위함 */ public class ParentLastURLClassLoader extends ClassLoader { private ChildURLClassLoader childClassLoader; /** * This class allows me to call findClass on a classloader */ private static class FindClassClassLoader extends ClassLoader { public FindClassClassLoader(ClassLoader parent) { super(parent); } @Override public Class<?> findClass(String name) throws ClassNotFoundException { return super.findClass(name); } } /** * This class delegates (child then parent) for the findClass method for a URLClassLoader. * We need this because findClass is protected in URLClassLoader */ private static class ChildURLClassLoader extends URLClassLoader { private FindClassClassLoader realParent; public ChildURLClassLoader( URL[] urls, FindClassClassLoader realParent ) { super(urls, null); this.realParent = realParent; } @Override public Class<?> findClass(String name) throws ClassNotFoundException { try { // first try to use the URLClassLoader findClass return super.findClass(name); } catch( ClassNotFoundException e ) { // if that fails, we ask our real parent classloader to load the class (we give up) return realParent.loadClass(name); } } } //List<URL> classpath public ParentLastURLClassLoader(URL[] urls) { super(Thread.currentThread().getContextClassLoader()); //URL[] urls = classpath.toArray(new URL[classpath.size()]); childClassLoader = new ChildURLClassLoader( urls, new FindClassClassLoader(this.getParent()) ); } @Override protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { try { // first we try to find a class inside the child classloader return childClassLoader.findClass(name); } catch( ClassNotFoundException e ) { // didn't find it, try the parent return super.loadClass(name, resolve); } } }