Example usage for org.springframework.boot.loader LaunchedURLClassLoader LaunchedURLClassLoader

Introduction

In this page you can find the example usage for org.springframework.boot.loader LaunchedURLClassLoader LaunchedURLClassLoader.

Prototype

public LaunchedURLClassLoader(URL[] urls, ClassLoader parent) 

Source Link

Document

Create a new LaunchedURLClassLoader instance.

Usage

From source file:org.springframework.cloud.dataflow.app.utils.ClassloaderUtils.java

/**
 * Creates a ClassLoader for the launched modules by merging the URLs supplied as argument with the URLs that
 * make up the additional classpath of the launched JVM (retrieved from the application classloader), and
 * setting the extension classloader of the JVM as parent, if accessible.
 *
 * @param urls a list of library URLs//from   w  ww. j ava2 s.c  om
 * @return the resulting classloader
 */
public static ClassLoader createModuleClassloader(URL[] urls) {
    ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
    if (log.isDebugEnabled()) {
        log.debug("systemClassLoader is " + systemClassLoader);
    }
    if (systemClassLoader instanceof URLClassLoader) {
        // add the URLs of the application classloader to the created classloader
        // to compensate for LaunchedURLClassLoader not delegating to parent to retrieve resources
        @SuppressWarnings("resource")
        URLClassLoader systemUrlClassLoader = (URLClassLoader) systemClassLoader;
        URL[] mergedUrls = new URL[urls.length + systemUrlClassLoader.getURLs().length];
        if (log.isDebugEnabled()) {
            log.debug("Original URLs: " + StringUtils.arrayToCommaDelimitedString(urls));
            log.debug("Java Classpath URLs: "
                    + StringUtils.arrayToCommaDelimitedString(systemUrlClassLoader.getURLs()));
        }
        System.arraycopy(urls, 0, mergedUrls, 0, urls.length);
        System.arraycopy(systemUrlClassLoader.getURLs(), 0, mergedUrls, urls.length,
                systemUrlClassLoader.getURLs().length);
        // add the extension classloader as parent to the created context, if accessible
        if (log.isDebugEnabled()) {
            log.debug("Classloader URLs: " + StringUtils.arrayToCommaDelimitedString(mergedUrls));
        }
        return new LaunchedURLClassLoader(mergedUrls, systemUrlClassLoader.getParent());
    }
    return new LaunchedURLClassLoader(urls, systemClassLoader);
}

---