gharris1727 commented on code in PR #16604:
URL: https://github.com/apache/kafka/pull/16604#discussion_r1700627317


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connect/runtime/src/main/java/org/apache/kafka/connect/runtime/isolation/PluginUtils.java:
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@@ -453,4 +457,56 @@ private static class DirectoryEntry {
         }
     }
 
+    private static Collection<URL> forJavaClassPath() {
+        Collection<URL> urls = new ArrayList<>();
+        String javaClassPath = System.getProperty("java.class.path");
+        if (javaClassPath != null) {
+            for (String path : javaClassPath.split(File.pathSeparator)) {
+                try {
+                    urls.add(new File(path).toURI().toURL());
+                } catch (Exception e) {
+                    log.debug("Could not get URL", e);
+                }
+            }
+        }
+        return distinctUrls(urls);
+    }
+    
+    private static Collection<URL> forClassLoader(ClassLoader classLoader) {
+        final Collection<URL> result = new ArrayList<URL>();
+        final ClassLoader[] loaders = classLoaders(classLoader);
+        for (ClassLoader loader : loaders) {
+            while (loader != null) {
+                if (loader instanceof URLClassLoader) {
+                    URL[] urls = ((URLClassLoader) loader).getURLs();
+                    if (urls != null) {
+                        result.addAll(new HashSet<URL>(Arrays.asList(urls)));
+                    }
+                }
+                loader = loader.getParent();
+            }
+        }
+        return distinctUrls(result);
+    }
+    
+    private static ClassLoader[] classLoaders(ClassLoader classLoader) {
+        if (classLoader == null) {

Review Comment:
   I think this condition is wrong. And the condition probably shouldn't exist, 
because classLoader is never null.



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