Java Utililty Methods Class Loader

List of utility methods to do Class Loader

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Description

The list of methods to do Class Loader are organized into topic(s).

Method

booleanaddDirectoryToClassLoader(ClassLoader loader, File directory)
add Directory To Class Loader 
try {
    ClassLoader rootLoader = getRootLoader(loader);
    if (rootLoader == null) {
        return false;
    } else {
        URL url = directory.toURI().toURL();
        Method method = rootLoader.getClass().getMethod("addURL", URL.class);
        method.invoke(rootLoader, url);
...
voidaddFileToSystemClassLoader(String s)
add File To System Class Loader 
File f = new File(s);
addFileToSystemClassLoader(f);
ClassLoadercreateClassloader(File libDir, ClassLoader cl)
Create a class loader that can load classes from the specified file directory. 
URLClassLoader urlClassloader = null;
if (libDir.exists()) {
    if (libDir.isDirectory()) {
        String[] jars = libDir.list(new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.endsWith(".jar") || name.endsWith(".zip");
        });
...
URLClassLoadercreateClassLoader(File root)
create Class Loader 
return new URLClassLoader(new URL[] { root.toURI().toURL() },
        Thread.currentThread().getContextClassLoader());
ClassLoadercreateClassLoader(final String[] cpEntries)
Builds a ClassLoader for a given classpath. 
final URL[] cpUrls = new URL[cpEntries.length];
for (int i = 0; i < cpEntries.length; i++) {
    String cpEntry = cpEntries[i];
    File entry = new File(cpEntry);
    try {
        URL url = entry.toURI().toURL();
        cpUrls[i] = url;
    } catch (MalformedURLException ex) {
...
URLClassLoadercreateClassLoader(String fileName)
create Class Loader 
String urlPath = makeUrlPath(fileName);
URL url = null;
try {
    url = new URL(urlPath);
} catch (MalformedURLException e) {
    throw new RuntimeException(e);
URLClassLoader loader = URLClassLoader.newInstance(new URL[] { url });
...
URLClassLoadercreateFallbackClassLoader(Collection files)
create Fallback Class Loader 
List<URL> urls = new ArrayList<URL>(files.size());
for (File file : files) {
    urls.add(file.toURI().toURL());
return new URLClassLoader(urls.toArray(new URL[urls.size()]), null);
voiddumpClassLoader(ClassLoader cl, PrintWriter out)
dump Class Loader 
int level = 0;
while (cl != null) {
    String msg = "Servlet ClassLoader[" + level + "]: " + cl.getClass().getName() + ':' + cl.hashCode();
    out.println(msg);
    URL[] urls = getClassLoaderURLs(cl);
    msg = "  URLs:";
    out.println(msg);
    for (int u = 0; u < urls.length; u++) {
...
ClassgetClass(Object classLoaderMakedObject, File file, String targetClass)
get Class 
URL[] urls = { file.toURI().toURL() };
URLClassLoader classLoader = (URLClassLoader) classLoaderMakedObject.getClass().getClassLoader();
ClassLoader loader = URLClassLoader.newInstance(urls, classLoader);
Class<?> clazz = loader.loadClass(targetClass);
return clazz;
InputStreamgetClassInputStream(String className, ClassLoader cl)
get Class Input Stream 
return cl.getResourceAsStream(classToResource(className));