--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java	Sat Nov 12 09:26:08 2016 -0800
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java	Mon Nov 14 19:45:41 2016 +0530
@@ -383,7 +383,19 @@
         addRootPackageFor(unnamedModule);
         unnamedModule.enclosedPackages = unnamedModule.enclosedPackages.prepend(unnamedModule.unnamedPackage);
 
-        errModule = new ModuleSymbol(names.empty, null) { };
+        errModule = new ModuleSymbol(names.empty, null) {
+                {
+                    directives = List.nil();
+                    exports = List.nil();
+                    provides = List.nil();
+                    uses = List.nil();
+                    ModuleSymbol java_base = enterModule(names.java_base);
+                    com.sun.tools.javac.code.Directive.RequiresDirective d =
+                            new com.sun.tools.javac.code.Directive.RequiresDirective(java_base,
+                                    EnumSet.of(com.sun.tools.javac.code.Directive.RequiresFlag.MANDATED));
+                    requires = List.of(d);
+                }
+            };
         addRootPackageFor(errModule);
 
         noModule = new ModuleSymbol(names.empty, null) {

--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java	Sat Nov 12 09:26:08 2016 -0800
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java	Mon Nov 14 19:45:41 2016 +0530
@@ -293,8 +293,11 @@
     private void enterModule(JCCompilationUnit toplevel, ClassSymbol c, Set<ModuleSymbol> modules) {
         boolean isModuleInfo = toplevel.sourcefile.isNameCompatible("module-info", Kind.SOURCE);
         boolean isModuleDecl = toplevel.defs.nonEmpty() && toplevel.defs.head.hasTag(MODULEDEF);
-        if (isModuleInfo && isModuleDecl) {
+        if (isModuleDecl) {
             JCModuleDecl decl = (JCModuleDecl) toplevel.defs.head;
+            if (!isModuleInfo) {
+                log.error(decl.pos(), Errors.ModuleDeclSbInModuleInfoJava);
+            }
             Name name = TreeInfo.fullName(decl.qualId);
             ModuleSymbol sym;
             if (c != null) {
@@ -330,9 +333,6 @@
                 JCTree tree = toplevel.defs.isEmpty() ? toplevel : toplevel.defs.head;
                 log.error(tree.pos(), Errors.ExpectedModule);
             }
-        } else if (isModuleDecl) {
-            JCTree tree = toplevel.defs.head;
-            log.error(tree.pos(), Errors.ModuleDeclSbInModuleInfoJava);
         }
     }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/modules/AnnotationProcessingWithModuleInfoInWrongPlace.java	Mon Nov 14 19:45:41 2016 +0530
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2016, 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 8168312
+ * @summary javac throws NPE if annotation processor is specified and module is declared in a file named arbitrarily
+ * @library /tools/lib
+ * @modules
+ *      jdk.compiler/com.sun.tools.javac.api
+ *      jdk.compiler/com.sun.tools.javac.main
+ * @build toolbox.ToolBox toolbox.JavacTask ModuleTestBase
+ * @run main AnnotationProcessingWithModuleInfoInWrongPlace
+ */
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Set;
+
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.TypeElement;
+
+import toolbox.JavacTask;
+import toolbox.Task;
+
+public class AnnotationProcessingWithModuleInfoInWrongPlace extends ModuleTestBase {
+
+    public static void main(String... args) throws Exception {
+        new AnnotationProcessingWithModuleInfoInWrongPlace().runTests();
+    }
+
+    @Test
+    public void testModuleInfoInWrongPlace(Path base) throws Exception {
+        Path moduleSrc = base.resolve("module-src");
+        Path m = moduleSrc.resolve("m");
+
+        Path classes = base.resolve("classes");
+
+        Files.createDirectories(classes);
+
+        tb.writeJavaFiles(m, "module m {}");
+
+        Path mi = m.resolve("module-info.java");
+        Path f = m.resolve("F.java");
+
+        tb.moveFile(mi, f);
+
+        String log = new JavacTask(tb)
+                .options("-XDrawDiagnostics",
+                         "--module-source-path", moduleSrc.toString(),
+                         "-processor", AP.class.getName())
+                .outdir(classes)
+                .files(findJavaFiles(moduleSrc))
+                .run(Task.Expect.FAIL)
+                .writeAll()
+                .getOutput(Task.OutputKind.DIRECT);
+
+
+        if (!log.contains("F.java:1:1: compiler.err.module.decl.sb.in.module-info.java"))
+            throw new AssertionError("Unexpected output: " + log);
+    }
+
+    @SupportedAnnotationTypes("*")
+    public static final class AP extends AbstractProcessor {
+
+        @Override
+        public boolean process(Set<? extends TypeElement> annot, RoundEnvironment env) {
+            return false;
+        }
+
+        @Override
+        public SourceVersion getSupportedSourceVersion() {
+            return SourceVersion.latest();
+        }
+    }
+}