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‎LICENSE

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Apache License
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‎README.md

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# URLExtraLoader
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## or Java extra classpath
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URLExtraLoader is a utility that allows you to quickly and easily create a URLClassLoader or work with an existing instance.
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Functions:
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1) Create your own URLClassLoader with dynamic modification of Classpath on the fly and control of resources loaded into Classpath.
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2) Extension of the standard URLClassLoader with a wrapper.
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3) A utility to work on the fly. It is sufficient to pass a reference to the loader object.
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Default way to work with URLClassLoader.
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In this way, we cannot add files to Classpath.
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```java
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URLClassLoader classLoader = new URLClassLoader(new URL[]{
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new URL("file:\\test.jar")
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});
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```
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**URLExtraClassLoader**
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```java
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Extra extra = new ExtraURLClassloader(new URL[]{
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new URL("file:\\test.jar")
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});
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```
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We can now add and remove files to Classpath dynamically.
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```java
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extra.add(new File("test.jar"));
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```
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Example of using the **URLClassLoader** wrapper
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```java
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Extra extra = new URLClassloaderWrapper(new URLClassLoader(new URL[0]));
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extra.add(new File("test.jar"));
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```
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You can also use **ClasspathUtils**. <br/> Let's create a new instance of URLClassLoader and add a test jar file to Classpath.
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```java
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URLClassLoader urlClassLoader = new URLClassLoader(new URL[0]);
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ClasspathUtils.addToPath(new URL("file:\\test.jar"), urlClassLoader);
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```
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## Open source
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URLExtraLoader is an open source project distributed under the Apache License 2.0 <br>
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## Getting started
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1. Download the latest build from releases
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2. Read the FAQ and examples
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3. Enjoy!
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## Status
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The project is in beta. Use at your own risk. <br>
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‎src/ua/juniffiro/extra/classpath/ClasspathUtils.java

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package ua.juniffiro.extra.classpath;
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import sun.misc.URLClassPath;
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import java.io.File;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Stack;
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/**
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* +-+-+-+-+-+ +-+-+ +-+-+-+-+-+-+-+-+-+
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* ( Created ) ( by ) ( @juniffiro )
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* 27/02/2023
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* +-+-+-+-+-+ +-+-+ +-+-+-+-+-+-+-+-+-+
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*/
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public class ClasspathUtils {
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/*
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A utility for working with application
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Classpath on the fly.
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*/
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/**
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* Get application Classpath.
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*
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* @return Application 'java.class.path'.
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*/
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public static Collection<String> getClasspath() {
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String classPath = System.getProperty("java.class.path", ".");
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String[] split = classPath.split(File.pathSeparator);
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return new HashSet<>(Arrays.asList(split));
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}
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/**
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* Check if the file is loaded in Classpath.
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* @param path
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* Path to the file you want to check
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*/
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public static boolean checkInClasspath(String path) {
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return getClasspath().contains(path);
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}
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/**
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* Load the file into the Classpath
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* of a specific application "on the fly"
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* with URL.
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* @param url
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* URL of the desired file
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* @param loader
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* URLClassLoader
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* @throws Exception
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* In the case of an error when loading.
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* Can be related to either a URL error
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* or an exception on the Reflection API side.
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*/
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public static void addToPath(URL url, URLClassLoader loader) throws Exception {
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Method addUrl = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
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addUrl.setAccessible(true);
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addUrl.invoke(loader, url);
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addUrl.setAccessible(false);
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}
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/**
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* Deleting a file from a certain Classpath
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* of a certain application "on the fly"
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* with URL.
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* @param loader
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* URLClassLoader
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* @throws Exception
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* In the case of an error when deleting.
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* Can be related to either a URL error
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* or an exception on the Reflection API side.
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*/
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public static void removePath(URL url, URLClassLoader loader) throws Exception {
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Class<?> urlClass = URLClassLoader.class;
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Field ucpField = urlClass.getDeclaredField("ucp");
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ucpField.setAccessible(true);
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URLClassPath ucp = (URLClassPath) ucpField.get(loader);
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Class<?> ucpClass = URLClassPath.class;
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Field urlsField = ucpClass.getDeclaredField("urls");
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urlsField.setAccessible(true);
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Stack urls = (Stack) urlsField.get(ucp);
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urls.remove(url);
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urlsField.setAccessible(false);
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ucpField.setAccessible(false);
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}
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}

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