com.taobao.arthas.agent.attach.AttachArthasClassloader Maven / Gradle / Ivy
package com.taobao.arthas.agent.attach;
import java.net.URL;
import java.net.URLClassLoader;
/**
*
* @author hengyunabc 2020-06-22
*
*/
public class AttachArthasClassloader extends URLClassLoader {
public AttachArthasClassloader(URL[] urls) {
super(urls, ClassLoader.getSystemClassLoader().getParent());
}
@Override
protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
final Class loadedClass = findLoadedClass(name);
if (loadedClass != null) {
return loadedClass;
}
// 优先从parent（SystemClassLoader）里加载系统类，避免抛出ClassNotFoundException
if (name != null && (name.startsWith("sun.") || name.startsWith("java."))) {
return super.loadClass(name, resolve);
}
try {
Class aClass = findClass(name);
if (resolve) {
resolveClass(aClass);
}
return aClass;
} catch (Exception e) {
// ignore
}
return super.loadClass(name, resolve);
}
}