Github user bbende commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1156#discussion_r86226932
  
    --- Diff: 
nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/file/classloader/ClassLoaderUtils.java
 ---
    @@ -52,23 +86,29 @@ public static ClassLoader getCustomClassLoader(String 
modulePath, ClassLoader pa
                         isUrl = false;
                     }
                     if (!isUrl) {
    -                    File modulePath = new File(modulePathString);
    +                    try {
    +                        File modulePath = new File(modulePathString);
     
    -                    if (modulePath.exists()) {
    +                        if (modulePath.exists()) {
     
    -                        
additionalClasspath.add(modulePath.toURI().toURL());
    +                            
additionalClasspath.add(modulePath.toURI().toURL());
     
    -                        if (modulePath.isDirectory()) {
    -                            File[] files = 
modulePath.listFiles(filenameFilter);
    +                            if (modulePath.isDirectory()) {
    +                                File[] files = 
modulePath.listFiles(filenameFilter);
     
    -                            if (files != null) {
    -                                for (File jarFile : files) {
    -                                    
additionalClasspath.add(jarFile.toURI().toURL());
    +                                if (files != null) {
    +                                    for (File jarFile : files) {
    +                                        
additionalClasspath.add(jarFile.toURI().toURL());
    --- End diff --
    
    I see what you mean, I'll add that check to see if it is a directory or 
file and handle accordingly


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