jiangyunpeng opened a new issue #2507: Dubbo 's ExtensionLoader may be can't find custom Extension URL: https://github.com/apache/incubator-dubbo/issues/2507 ### Environment * Dubbo version: 2.6.3 * Operating System version: mac OS * Java version: 1.8 ### Steps to reproduce this issue Dubbo通过 ExtensionLoader 加载各种SPI的实现，但是findClassLoader可能无法发现自定义SPI扩展点。 dubbo ExtensionLoader 代码： private void loadFile(Map<String, Class<?>> extensionClasses, String dir) { String fileName = dir + type.getName(); try { Enumeration<java.net.URL> urls; ClassLoader classLoader = findClassLoader(); if (classLoader != null) { urls = classLoader.getResources(fileName); } else { urls = ClassLoader.getSystemResources(fileName); } ...... } private static ClassLoader findClassLoader() { return ExtensionLoader.class.getClassLoader(); } 可以看到 ExtensionLoader 使用的是本身class所在的ClassLoader load 文件，当我们自定义的SPI扩展点和dubbo不在同一个classloader就会导致无法被load。 建议修改为 org.springframework.util.ClassUtils 中更合理的实现方式： public static ClassLoader getDefaultClassLoader() { ClassLoader cl = null; try { cl = Thread.currentThread().getContextClassLoader(); } catch (Throwable ex) { // Cannot access thread context ClassLoader - falling back... } if (cl == null) { // No thread context class loader -> use class loader of this class. cl = ClassUtils.class.getClassLoader(); if (cl == null) { // getClassLoader() returning null indicates the bootstrap ClassLoader try { cl = ClassLoader.getSystemClassLoader(); } catch (Throwable ex) { // Cannot access system ClassLoader - oh well, maybe the caller can live with null... } } } return cl;
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