Index: log4j-core/src/main/java/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- log4j-core/src/main/java/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.java	(date 1523489834000)
+++ log4j-core/src/main/java/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.java	(date 1523631328000)
@@ -19,6 +19,7 @@
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -198,13 +199,29 @@
                         close(stream, newURL);
                     }
                 } else if (VFS.equals(url.getProtocol())) {
-                    final String containerPath = urlPath.substring(1,
-                                                  urlPath.length() - packageName.length() - 2);
+                    final String containerPath = urlPath.substring(1, urlPath.length() - packageName.length() - 2);
                     final File containerFile = new File(containerPath);
-                    if (containerFile.isDirectory()) {
-                        loadImplementationsInDirectory(test, packageName, new File(containerFile, packageName));
-                    } else {
-                        loadImplementationsInJar(test, packageName, containerFile);
+                    if (containerFile.exists()) {
+                        if (containerFile.isDirectory()) {
+                            loadImplementationsInDirectory(test, packageName, new File(containerFile, packageName));
+                        } else {
+                            loadImplementationsInJar(test, packageName, containerFile);
+                        }
+                    } else {
+                        // fallback code for Jboss/Wildfly, if the file couldn't be found
+                        // by loading the path as a file, try to read the jar as a stream
+                        final String path = urlPath.substring(0, urlPath.length() - packageName.length() - 2);
+                        final URL newURL = new URL(url.getProtocol(), url.getHost(), path);
+
+                        try (final InputStream is = newURL.openStream()) {
+                            final JarInputStream jarStream;
+                            if (is instanceof JarInputStream) {
+                                jarStream = (JarInputStream) is;
+                            } else {
+                                jarStream = new JarInputStream(is);
+                            }
+                            loadImplementationsInJar(test, packageName, path, jarStream);
+                        }
                     }
                 } else if (BUNDLE_RESOURCE.equals(url.getProtocol())) {
                     loadImplementationsInBundle(test, packageName);