--- a/src/share/classes/com/sun/tools/javac/file/JavacFileManager.java	Mon Dec 13 17:35:57 2010 -0800
+++ b/src/share/classes/com/sun/tools/javac/file/JavacFileManager.java	Tue Dec 14 14:17:20 2010 -0800
@@ -869,8 +869,9 @@
             return false;
         if (!path.equals(uri.getPath())) // implicitly checks for embedded . and ..
             return false;
-        char first = path.charAt(0);
-        return first != '.' && first != '/';
+        if (path.startsWith("/") || path.startsWith("./") || path.startsWith("../"))
+            return false;
+        return true;
     }
 
     // Convenience method

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/processing/filer/TestValidRelativeNames.java	Tue Dec 14 14:17:20 2010 -0800
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2010, 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 6999891
+ * @summary Test valid relative names for Filer.createResource and Filer.getResource
+ * @library ../../lib
+ * @build   JavacTestingAbstractProcessor
+ * @compile TestValidRelativeNames.java
+ * @compile/process -processor TestValidRelativeNames -Amode=create java.lang.Object
+ * @compile/process -processor TestValidRelativeNames -Amode=get    java.lang.Object
+ */
+
+import java.io.*;
+import java.util.*;
+import javax.annotation.processing.*;
+import javax.lang.model.*;
+import javax.lang.model.element.*;
+import javax.tools.Diagnostic;
+import javax.tools.StandardLocation;
+
+@SupportedOptions("mode")
+public class TestValidRelativeNames extends JavacTestingAbstractProcessor {
+    enum Kind { READER_WRITER, INPUT_OUTPUT_STREAM };
+
+    static final String[] validRelativeNames = {
+            "foo", "foo.bar", ".foo", ".foo.bar", "foodir/bar", "foodir/.bar"
+    };
+
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        if (roundEnv.processingOver()) {
+            String mode = options.get("mode");
+            for (String relativeBase: validRelativeNames) {
+                for (Kind kind: Kind.values()) {
+                    if (mode.equals("create"))
+                        testCreate(relativeBase, kind);
+                    else
+                        testGet(relativeBase, kind);
+                }
+            }
+        }
+
+        return true;
+    }
+
+    void testCreate(String relativeBase, Kind kind) {
+        String relative = getRelative(relativeBase, kind);
+        System.out.println("test create relative path: " + relative + ", kind: " + kind);
+        try {
+            switch (kind) {
+                case READER_WRITER:
+                    try (Writer writer = filer.createResource(
+                            StandardLocation.CLASS_OUTPUT, "", relative).openWriter()) {
+                        writer.write(relative);
+                    }
+                    break;
+
+                case INPUT_OUTPUT_STREAM:
+                    try (OutputStream out = filer.createResource(
+                            StandardLocation.CLASS_OUTPUT, "", relative).openOutputStream()) {
+                        out.write(relative.getBytes());
+                    }
+                    break;
+            }
+        } catch (Exception e) {
+            messager.printMessage(Diagnostic.Kind.ERROR,
+                    "relative path: " + relative + ", kind: " + kind + ", unexpected exception: " + e);
+        }
+    }
+
+    void testGet(String relativeBase, Kind kind) {
+        String relative = getRelative(relativeBase, kind);
+        System.out.println("test get relative path: " + relative + ", kind: " + kind);
+        try {
+            switch (kind) {
+                case READER_WRITER:
+                    try (Reader reader = new BufferedReader(filer.getResource(
+                            StandardLocation.CLASS_OUTPUT, "", relative).openReader(true))) {
+                        StringBuilder sb = new StringBuilder();
+                        char[] buf = new char[1024];
+                        int n;
+                        while ((n = reader.read(buf, 0, buf.length)) > 0)
+                            sb.append(new String(buf, 0, n));
+                        if (!sb.toString().equals(relative)) {
+                            messager.printMessage(Diagnostic.Kind.ERROR, "unexpected content: " + sb);
+                        }
+                    }
+                    break;
+
+                case INPUT_OUTPUT_STREAM:
+                    try (InputStream in = new DataInputStream(filer.getResource(
+                            StandardLocation.CLASS_OUTPUT, "", relative).openInputStream())) {
+                        StringBuilder sb = new StringBuilder();
+                        byte[] buf = new byte[1024];
+                        int n;
+                        while ((n = in.read(buf, 0, buf.length)) > 0)
+                            sb.append(new String(buf, 0, n));
+                        if (!sb.toString().equals(relative)) {
+                            messager.printMessage(Diagnostic.Kind.ERROR, "unexpected content: " + sb);
+                        }
+                    }
+                    break;
+            }
+        } catch (Exception e) {
+            messager.printMessage(Diagnostic.Kind.ERROR,
+                    "relative path: " + relative + ", kind: " + kind + ", unexpected exception: " + e);
+        }
+    }
+
+    String getRelative(String relativeBase, Kind kind) {
+        String suffix = (kind == Kind.READER_WRITER ? "RW" : "IOS");
+        return relativeBase.replace("foo", "foo" + suffix);
+    }
+}
+