--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacRoundEnvironment.java	Sun Nov 04 13:06:02 2018 -0500
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacRoundEnvironment.java	Mon Nov 05 10:31:47 2018 +0100
@@ -31,6 +31,7 @@
 import javax.lang.model.util.*;
 import java.util.*;
 
+import com.sun.tools.javac.code.Source.Feature;
 import com.sun.tools.javac.util.DefinedBy;
 import com.sun.tools.javac.util.DefinedBy.Api;
 
@@ -53,17 +54,20 @@
     private final ProcessingEnvironment processingEnv;
     private final Elements eltUtils;
 
+    private final boolean allowModules;
+
     // Caller must pass in an immutable set
     private final Set<? extends Element> rootElements;
 
     JavacRoundEnvironment(boolean processingOver,
                           boolean errorRaised,
                           Set<? extends Element> rootElements,
-                          ProcessingEnvironment processingEnv) {
+                          JavacProcessingEnvironment processingEnv) {
         this.processingOver = processingOver;
         this.errorRaised = errorRaised;
         this.rootElements = rootElements;
         this.processingEnv = processingEnv;
+        this.allowModules = Feature.MODULES.allowedInSource(processingEnv.source);
         this.eltUtils = processingEnv.getElementUtils();
     }
 
@@ -287,9 +291,11 @@
         TypeElement annotationElement = eltUtils.getTypeElement(name);
         if (annotationElement != null)
             return annotationElement;
-        else {
+        else if (allowModules) {
             String moduleName = Objects.requireNonNullElse(annotation.getModule().getName(), "");
             return eltUtils.getTypeElement(eltUtils.getModuleElement(moduleName), name);
+        } else {
+            return null;
         }
     }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/processing/rounds/GetElementsAnnotatedWithOnMissing.java	Mon Nov 05 10:31:47 2018 +0100
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2018, 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 8213103
+ * @summary Checking getElementsAnnotatedWith works for unknown annotations and with -source 8.
+ * @library /tools/lib /tools/javac/lib
+ * @modules
+ *      jdk.compiler/com.sun.tools.javac.api
+ *      jdk.compiler/com.sun.tools.javac.main
+ * @build toolbox.ToolBox toolbox.JavacTask JavacTestingAbstractProcessor
+ * @run main GetElementsAnnotatedWithOnMissing
+ */
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Set;
+
+import javax.annotation.processing.RoundEnvironment;
+import javax.lang.model.element.TypeElement;
+
+import toolbox.JavacTask;
+import toolbox.Task;
+import toolbox.TestRunner;
+import toolbox.ToolBox;
+
+public class GetElementsAnnotatedWithOnMissing extends TestRunner {
+
+    public static void main(String... args) throws Exception {
+        new GetElementsAnnotatedWithOnMissing().runTests(
+                m -> new Object[] { Paths.get(m.getName()) }
+        );
+    }
+
+    private ToolBox tb = new ToolBox();
+
+    public GetElementsAnnotatedWithOnMissing() {
+        super(System.err);
+    }
+
+    @Test
+    public void testModuleInfoInWrongPlace(Path base) throws Exception {
+        Path src = base.resolve("src");
+        Path classes = base.resolve("classes");
+
+        Files.createDirectories(classes);
+
+        tb.writeJavaFiles(src, "package test; public class Test {}");
+
+        new JavacTask(tb)
+                .options("-XDrawDiagnostics",
+                         "-source", "8",
+                         "-classpath", "",
+                         "-sourcepath", src.toString(),
+                         "-processorpath", System.getProperty("test.class.path"),
+                         "-processor", AP.class.getName())
+                .outdir(classes)
+                .files(tb.findJavaFiles(src))
+                .run()
+                .writeAll()
+                .getOutput(Task.OutputKind.DIRECT);
+
+        new JavacTask(tb)
+                .options("-XDrawDiagnostics",
+                         "-classpath", "",
+                         "-sourcepath", src.toString(),
+                         "-processorpath", System.getProperty("test.class.path"),
+                         "-processor", AP.class.getName())
+                .outdir(classes)
+                .files(tb.findJavaFiles(src))
+                .run()
+                .writeAll()
+                .getOutput(Task.OutputKind.DIRECT);
+    }
+
+    public static final class AP extends JavacTestingAbstractProcessor {
+
+        @Override
+        public boolean process(Set<? extends TypeElement> annot, RoundEnvironment env) {
+            if (elements.getTypeElement(Ann.class.getCanonicalName()) != null) {
+                throw new IllegalStateException("Can resolve @Ann!");
+            }
+            env.getElementsAnnotatedWith(Ann.class);
+            return false;
+        }
+
+    }
+
+    public @interface Ann {}
+}