--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/processing/warnings/TestRepeatedItemsRuntime.java	Thu May 23 18:47:24 2019 -0700
@@ -0,0 +1,177 @@
+ /*
+ * Copyright (c) 2006, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8224177
+ * @summary Test warnings from the annotation processing runtime about malformed supported information from processors.
+ * @compile TestRepeatedItemsRuntime.java
+ * @compile/ref=gold_sv_none.out  -XDrawDiagnostics -processor TestRepeatedItemsRuntime -proc:only TestRepeatedItemsRuntime.java
+ * @compile/ref=auric_current.out -XDrawDiagnostics -processor TestRepeatedItemsRuntime -proc:only -Xlint:processing TestRepeatedItemsRuntime.java
+ */
+
+import java.lang.annotation.*;
+import java.util.*;
+import javax.annotation.processing.*;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.TypeElement;
+
+/**
+ * A warning should be issued by the logic in
+ * javax.annotation.processing.AbstractProcessor for the repeated
+ * information.  The "Foo" option warnings occur regardless of source
+ * level. The number of times the Baz annotation type is repeated
+ * depends on whether or not the source level supports modules.
+ */
+@Quux
+public class TestRepeatedItemsRuntime extends AbstractProcessor {
+
+    @Override
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latest();
+    }
+
+    @Override
+    public Set<String>getSupportedOptions() {
+        IdentityHashMap<String, Integer> temp = new IdentityHashMap<>();
+        // Use String constructor for identity map.
+        temp.put(new String("foo"), 1);
+        temp.put(new String("foo"), 2);
+
+        var returnValue = temp.keySet();
+        assert returnValue.size() == 2;
+        return returnValue;
+    }
+
+    /**
+     * Partial implementation of the Set interface with identity
+     * semantics and predictable iteration order.
+     *
+     * The javax.annotation.processing.Processor protocol relies on
+     * the iterator.
+     */
+    private static class ArrayBackedSet implements Set<String> {
+        private static String[] data = {"Quux",
+                                        "Quux",
+                                        "&&&/foo.Bar",
+                                        "foo.Bar",
+                                        "foo.Bar",
+                                        "quux/Quux",
+                                        "*"};
+        public ArrayBackedSet() {}
+
+        // Return an iterator of known iteration order so the set warning messages will be predictable.
+        @Override
+        public Iterator<String> iterator() {
+            return Arrays.asList(data).iterator();
+        }
+
+        @Override
+        public boolean add(String e) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean addAll(Collection<? extends String> c) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public void clear() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean contains(Object o){
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean containsAll(Collection<?> c) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            return o == this;
+        }
+
+        @Override
+        public int hashCode() {
+            int hash = 0;
+            for (String s : data) {
+                hash += s.hashCode();
+            }
+            return hash;
+        }
+
+        @Override
+        public boolean isEmpty() {
+            return data.length > 0;
+        }
+
+        @Override
+        public boolean remove(Object o) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean removeAll(Collection<?> c) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean retainAll(Collection<?> c) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public int size() {
+            return data.length;
+        }
+
+        @Override
+        public Object[] toArray() {
+            return data.clone();
+        }
+
+        @Override
+        public <T> T[] toArray(T[] a) {
+            throw new UnsupportedOperationException();
+        }
+    }
+
+    @Override
+    public Set<String>getSupportedAnnotationTypes() {
+        return new ArrayBackedSet();
+    }
+
+    public boolean process(Set<? extends TypeElement> annotations,
+                           RoundEnvironment roundEnvironment) {
+        return true;
+    }
+}
+
+@Retention(RetentionPolicy.RUNTIME)
+@interface Quux {
+}