Fixes #4304: ResourceConfig not properly using specified ClassLoader

core-server/src/main/java/org/glassfish/jersey/server/ResourceConfig.java

@@ -655,6 +655,27 @@ public final ResourceConfig packages(final boolean recursive, final String... pa
         return registerFinder(new PackageNamesScanner(packages, recursive));
     }
 
+    /**
+     * Adds array of package names which will be used to scan for components.
+     * <p/>
+     * Package scanning ignores an inheritance and therefore {@link Path} annotation
+     * on parent classes and interfaces will be ignored.
+     * <p/>
+     * @param recursive defines whether any nested packages in the collection of specified
+     *                  package names should be recursively scanned (value of {@code true})
+     *                  as part of the package scanning or not (value of {@code false}).
+     * @param classLoader defines the classloader used for scanning the packages and loading the classes.
+     * @param packages  array of package names.
+     * @return updated resource configuration instance.
+     * @see #packages(String...)
+     */
+    public final ResourceConfig packages(final boolean recursive, final ClassLoader classLoader, final String... packages) {
+        if (packages == null || packages.length == 0) {
+            return this;
+        }
+        return registerFinder(new PackageNamesScanner(classLoader, packages, recursive));
+    }
+
     /**
      * Adds array of file and directory names to scan for components.
      * <p/>
@@ -877,11 +898,21 @@ private Set<Class<?>> scanClasses() {
             rfs.add(new FilesScanner(classPathElements, true));
         }
 
-        final AnnotationAcceptingListener afl =
+        final AnnotationAcceptingListener parentAfl =
                 AnnotationAcceptingListener.newJaxrsResourceAndProviderListener(_state.getClassLoader());
+
         for (final ResourceFinder resourceFinder : rfs) {
+            AnnotationAcceptingListener afl = parentAfl;
+
+            // Workaround because otherwise classes from a different classloader can't be loaded
+            if (resourceFinder instanceof PackageNamesScanner) {
+                final ClassLoader classLoader = ((PackageNamesScanner) resourceFinder).getClassloader();
+                afl = AnnotationAcceptingListener.newJaxrsResourceAndProviderListener(classLoader);
+            }
+
             while (resourceFinder.hasNext()) {
                 final String next = resourceFinder.next();
+
                 if (afl.accept(next)) {
                     final InputStream in = resourceFinder.open();
                     try {
@@ -896,10 +927,11 @@ private Set<Class<?>> scanClasses() {
                         }
                     }
                 }
+
+                result.addAll(afl.getAnnotatedClasses());
             }
         }
 
-        result.addAll(afl.getAnnotatedClasses());
         return result;
     }
 

core-server/src/main/java/org/glassfish/jersey/server/internal/scanning/PackageNamesScanner.java

@@ -164,6 +164,10 @@ public void reset() {
         init();
     }
 
+    public ClassLoader getClassloader() {
+        return classloader;
+    }
+
     private void init() {
         compositeResourceFinder = new CompositeResourceFinder();