--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/file/Locations.java	Sat Feb 25 18:02:06 2017 -0800
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/file/Locations.java	Tue Feb 28 13:57:39 2017 -0800
@@ -963,7 +963,7 @@
         void add(ModuleLocationHandler h) {
             nameMap.put(h.moduleName, h);
             for (Path p : h.searchPath) {
-                pathMap.put(p.toAbsolutePath().normalize(), h);
+                pathMap.put(normalize(p), h);
             }
         }
 
@@ -977,7 +977,7 @@
                 }
             }
             for (Path p : h.searchPath) {
-                pathMap.put(p.toAbsolutePath().normalize(), h);
+                pathMap.put(normalize(p), h);
             }
         }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/modules/SourceInSymlinkTest.java	Tue Feb 28 13:57:39 2017 -0800
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2017, 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 8175990
+ * @summary source in symbolic link
+ * @library /tools/lib
+ * @modules
+ *      jdk.compiler/com.sun.tools.javac.api
+ *      jdk.compiler/com.sun.tools.javac.main
+ * @build toolbox.ToolBox toolbox.JarTask toolbox.JavacTask ModuleTestBase
+ * @run main SourceInSymlinkTest
+ */
+
+import java.nio.file.*;
+import javax.tools.*;
+
+import toolbox.JarTask;
+import toolbox.JavacTask;
+import toolbox.Task;
+import toolbox.ToolBox;
+
+public class SourceInSymlinkTest extends ModuleTestBase {
+    public static void main(String... args) throws Exception {
+        SourceInSymlinkTest t = new SourceInSymlinkTest();
+        t.runTests();
+    }
+
+    @Test
+    public void testModuleSourcePath(Path base) throws Exception {
+        Path src = base.resolve("src");
+        Path src_m = src.resolve("m");
+        tb.writeFile(src_m.resolve("module-info.java"), "module m { }");
+        tb.writeJavaFiles(src_m, "package p; public class A{}");
+
+        Path classes = base.resolve("classes");
+        Files.createDirectories(classes);
+
+        new JavacTask(tb)
+            .options("--module-source-path", src.toString())
+            .outdir(classes)
+            .files(src_m.resolve("p/A.java"))
+            .run()
+            .writeAll();
+
+        checkFiles(
+            classes.resolve("m/module-info.class"),
+            classes.resolve("m/p/A.class"));
+
+        // ok normal case works, now create a symlink to the source
+        Path lsrc = base.resolve("link");
+        Path lsrc_m = src.resolve("m");
+        Path lclasses = base.resolve("link-out");
+        Files.createDirectories(lclasses);
+        try {
+            Files.createSymbolicLink(lsrc, Paths.get("src"));
+        } catch (FileSystemException fse) {
+            System.err.println("warning: test passes vacuously, sym-link could not be created");
+            System.err.println(fse.getMessage());
+            return;
+        }
+        new JavacTask(tb)
+            .options("--module-source-path", lsrc.toString())
+            .outdir(lclasses)
+            .files(lsrc_m.resolve("p/A.java"))
+            .run()
+            .writeAll();
+
+        checkFiles(
+            lclasses.resolve("m/module-info.class"),
+            lclasses.resolve("m/p/A.class"));
+
+    }
+
+    void checkFiles(Path... files) throws Exception {
+        for (Path f: files) {
+            if (!Files.exists(f))
+                throw new Exception("expected file not found: " + f);
+        }
+    }
+}