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Utility JAR for copying a file tree from web server or from classpath resources to a (local) file system.

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package com.giraone.io.copier.common;

/**
 * Miscellaneous java.lang.Class utility methods inspired by org.springframework.util.ClassUtils.
 */
public class ClassUtils {

    /**
     * Return the default ClassLoader to use:
     * 
     *     typically the thread context ClassLoader, if available.
     *     otherwise the ClassLoader that loaded this ClassUtils class
     * 
     * Call this method if you intend to use the thread context ClassLoader in a scenario where you clearly prefer a non-null
     * ClassLoader reference: for example, for class path resource loading.
     *
     * @return a class loader or null
     */
    public static ClassLoader getDefaultClassLoader() {

        ClassLoader ret = null;
        try {
            ret = Thread.currentThread().getContextClassLoader();
        } catch (Throwable ex) {
            // Cannot get thread context ClassLoader - using fallback...
        }
        if (ret == null) {
            // No thread context class loader -> use class loader of this class.
            ret = ClassUtils.class.getClassLoader();
            if (ret == null) {
                // getClassLoader() returning null indicates the bootstrap ClassLoader.
                try {
                    ret = ClassLoader.getSystemClassLoader();
                } catch (Throwable ex) {
                    // Cannot access system ClassLoader - the caller must live with null.
                }
            }
        }
        return ret;
    }
}