Load jar in ClassLoad

Question

I need load jar in ClassLoad, I did write code, but he not work. what is the problem?
package jar;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
public class Jar1 {
    public static void main(String[] args) {
        try {
            String filePath = "/home/pitbull/temp/plugins/script.jar";
            printJar(filePath);
            load(filePath);
        } catch (Exception e) {
            e.printStackTrace();
    public static void printJar(String path) throws IOException {
        JarFile jarFile = new JarFile(path);
        Enumeration entries = jarFile.entries();
        while (entries.hasMoreElements()) {
            ZipEntry entry = (ZipEntry) entries.nextElement();
            System.out.println(entry.getName());
        jarFile.close();
    public static void load(String filePath) throws MalformedURLException, ClassNotFoundException {
        filePath = "jar:file://" + filePath + "!/";
        URL url = new File(filePath).toURI().toURL();
        URLClassLoader clazzLoader = new URLClassLoader(new URL[]{url});
        Class clazz = clazzLoader.loadClass("scripts.task_custom_field_value.MessageFormat");
        for (Method method : clazz.getMethods()) {
            System.out.println(method.getName());
}This jar "/home/pitbull/temp/plugins/script.jar" not classpath.

Answer 1

Get exception. But class scripts.task_custom_field_value.MessageFormat.class is exactly have in jar.
java.lang.ClassNotFoundException: scripts.task_custom_field_value.MessageFormat
     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     at jar.Jar1.load(Jar1.java:38)
     at jar.Jar1.main(Jar1.java:18)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:115)Edited by: P1tBull on Jul 27, 2010 2:17 AM