--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/NoStringToLower.java	Tue Dec 17 10:55:59 2013 +0100
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2013, 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 8029800
+ * @summary String.toLowerCase()/toUpperCase is generally dangerous, check it is not used in langtools
+ */
+
+import java.io.*;
+import java.util.*;
+import javax.tools.*;
+import com.sun.tools.classfile.*;
+import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
+
+public class NoStringToLower {
+    public static void main(String... args) throws Exception {
+        NoStringToLower c = new NoStringToLower();
+        if (c.run(args))
+            return;
+
+        if (is_jtreg())
+            throw new Exception(c.errors + " errors occurred");
+        else
+            System.exit(1);
+    }
+
+    static boolean is_jtreg() {
+        return (System.getProperty("test.src") != null);
+    }
+
+    /**
+     * Main entry point.
+     */
+    boolean run(String... args) throws Exception {
+        JavaCompiler c = ToolProvider.getSystemJavaCompiler();
+        JavaFileManager fm = c.getStandardFileManager(null, null, null);
+        JavaFileManager.Location javacLoc = findJavacLocation(fm);
+        String[] pkgs = {
+            "javax.annotation.processing",
+            "javax.lang.model",
+            "javax.tools",
+            "com.sun.source",
+            "com.sun.tools"
+        };
+        for (String pkg: pkgs) {
+            for (JavaFileObject fo: fm.list(javacLoc,
+                    pkg, EnumSet.of(JavaFileObject.Kind.CLASS), true)) {
+                scan(fo);
+            }
+        }
+
+        return (errors == 0);
+    }
+
+    // depending on how the test is run, javac may be on bootclasspath or classpath
+    JavaFileManager.Location findJavacLocation(JavaFileManager fm) {
+        JavaFileManager.Location[] locns =
+            { StandardLocation.PLATFORM_CLASS_PATH, StandardLocation.CLASS_PATH };
+        try {
+            for (JavaFileManager.Location l: locns) {
+                JavaFileObject fo = fm.getJavaFileForInput(l,
+                    "com.sun.tools.javac.Main", JavaFileObject.Kind.CLASS);
+                if (fo != null)
+                    return l;
+            }
+        } catch (IOException e) {
+            throw new Error(e);
+        }
+        throw new IllegalStateException("Cannot find javac");
+    }
+
+    /**
+     * Verify there are no references to String.toLowerCase() in a class file.
+     */
+    void scan(JavaFileObject fo) throws IOException {
+        InputStream in = fo.openInputStream();
+        try {
+            ClassFile cf = ClassFile.read(in);
+            for (ConstantPool.CPInfo cpinfo: cf.constant_pool.entries()) {
+                if (cpinfo.getTag() == ConstantPool.CONSTANT_Methodref) {
+                    CONSTANT_Methodref_info ref = (CONSTANT_Methodref_info) cpinfo;
+                    String methodDesc = ref.getClassInfo().getName() + "." + ref.getNameAndTypeInfo().getName() + ":" + ref.getNameAndTypeInfo().getType();
+
+                    if ("java/lang/String.toLowerCase:()Ljava/lang/String;".equals(methodDesc)) {
+                        error("found reference to String.toLowerCase() in: " + fo.getName());
+                    }
+                    if ("java/lang/String.toUpperCase:()Ljava/lang/String;".equals(methodDesc)) {
+                        error("found reference to String.toLowerCase() in: " + fo.getName());
+                    }
+                }
+            }
+        } catch (ConstantPoolException ignore) {
+        } finally {
+            in.close();
+        }
+    }
+
+    /**
+     * Report an error.
+     */
+    void error(String msg) {
+        System.err.println("Error: " + msg);
+        errors++;
+    }
+
+    int errors;
+}