Java Utililty Methods Jar File Load

List of utility methods to do Jar File Load

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Description

The list of methods to do Jar File Load are organized into topic(s).

Method

List>loadClassesFromJar(final String jarPath, final CharSequence matchingPath)
load Classes From Jar 
List<Class<?>> classes = new ArrayList<>();
try {
    JarFile jarFile = new JarFile(jarPath);
    Enumeration<JarEntry> jarEntries = jarFile.entries();
    URLClassLoader cl = URLClassLoader.newInstance(new URL[] { new URL("jar:file:" + jarPath + "!/") });
    while (jarEntries.hasMoreElements()) {
        JarEntry jarEntry = jarEntries.nextElement();
        if (jarEntry.isDirectory() || !jarEntry.toString().contains(matchingPath)
...
ClassloadClassFromJar(String jarAbsolutePath, String className)
load Class From Jar 
Class result;
URL[] classLoaderUrls = new URL[] { new File(jarAbsolutePath).toURI().toURL() };
URLClassLoader child = new URLClassLoader(classLoaderUrls);
result = child.loadClass(className);
return result;
ClassLoaderloadJar(File jar)
Load a jar 
java.net.URL url = jar.toURI().toURL();
return new URLClassLoader(new URL[] { url });
voidloadJar(String jarPath)
Loads a JAR file so the application can access its classes. 
File f = new File(jarPath);
URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
method.setAccessible(true);
method.invoke(sysloader, new Object[] { f.toURI().toURL() });
ClassLoaderloadJar(String path)
load Jar 
URL url = new File(path).toURI().toURL();
URL[] urls = new URL[] { url };
return new URLClassLoader(urls);
TloadJarFile(File jarFile, String className)
Loads class className from the jar file jarFile. 
URL[] urls = new URL[] { jarFile.toURI().toURL() };
URLClassLoader classLoader = new URLClassLoader(urls, Thread.currentThread().getContextClassLoader());
Class<?> cls = classLoader.loadClass(className);
return (T) cls.newInstance();
voidloadJarInSystemClassLoader(File out)
load Jar In System Class Loader 
try {
    URLClassLoader systemClassLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    Method declaredMethod = URLClassLoader.class.getDeclaredMethod("addURL", new Class[] { URL.class });
    declaredMethod.setAccessible(true);
    declaredMethod.invoke(systemClassLoader, out.toURI().toURL());
} catch (Exception e) {
    throw new IllegalStateException(e);
voidloadJarIntoClasspath(File jarFile)
load Jar Into Classpath 
try {
    URL url = jarFile.toURI().toURL();
    URLClassLoader classLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
    method.setAccessible(true);
    method.invoke(classLoader, url);
} catch (Exception e) {
    System.out.println("Failed to load " + jarFile + " into classpath.");
...
File[]loadJarsFromDir(final File dir)
load Jars From Dir 
final File[] jars = dir.listFiles(new FilenameFilter() {
    @Override
    public boolean accept(final File dir, final String name) {
        return name.endsWith(".jar");
});
for (int i = 0; i < jars.length; i++) {
    final JarFile jarFile = new JarFile(jars[i]);
...