--- /dev/null	2012-02-29 08:26:07.944315018 +0100
+++ new/make/tools/anttasks/GenStubsTask.java	2012-03-02 15:59:36.345604422 +0100
@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2009, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package anttasks;
+
+import genstubs.GenStubs;
+
+import java.io.*;
+import java.util.*;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.DirectoryScanner;
+import org.apache.tools.ant.taskdefs.MatchingTask;
+import org.apache.tools.ant.types.Path;
+import org.apache.tools.ant.types.Reference;
+
+/**
+ * Files are specified with an implicit fileset, using srcdir as a base directory.
+ * The set of files to be included is specified with an includes attribute or
+ * nested <includes> set. However, unlike a normal fileset, an empty includes attribute
+ * means "no files" instead of "all files".  The Ant task also accepts "fork=true" and
+ * classpath attribute or nested <classpath> element to run GenStubs in a separate VM
+ * with the specified path. This is likely necessary if a JDK 7 parser is required to read the
+ * JDK 7 input files.
+ */
+public class GenStubsTask extends MatchingTask {
+    private File srcDir;
+    private File destDir;
+    private boolean fork;
+    private Path classpath;
+    private String includes;
+    
+    public void setSrcDir(File dir) {
+        this.srcDir = dir;
+    }
+    
+    public void setDestDir(File dir) {
+        this.destDir = dir;
+    }
+    
+    public void setFork(boolean v) {
+        this.fork = v;
+    }
+    
+    public void setClasspath(Path cp) {
+        if (classpath == null)
+            classpath = cp;
+        else
+            classpath.append(cp);
+    }
+    
+    public Path createClasspath() {
+        if (classpath == null) {
+            classpath = new Path(getProject());
+        }
+        return classpath.createPath();
+    }
+    
+    public void setClasspathRef(Reference r) {
+        createClasspath().setRefid(r);
+    }
+    
+    public void setIncludes(String includes) {
+        super.setIncludes(includes);
+        this.includes = includes;
+    }
+    
+    @Override
+    public void execute() {
+        if (includes != null && includes.trim().isEmpty())
+            return;
+        
+        DirectoryScanner s = getDirectoryScanner(srcDir);
+        String[] files = s.getIncludedFiles();
+//            System.err.println("Ant.execute: srcDir " + srcDir);
+//            System.err.println("Ant.execute: destDir " + destDir);
+//            System.err.println("Ant.execute: files " + Arrays.asList(files));
+        
+        files = filter(srcDir, destDir, files);
+        if (files.length == 0)
+            return;
+        System.out.println("Generating " + files.length + " stub files to " + destDir);
+        
+        List<String> classNames = new ArrayList<String>();
+        for (String file: files) {
+            classNames.add(file.replaceAll(".java$", "").replace('/', '.'));
+        }
+        
+        if (!fork) {
+            GenStubs m = new GenStubs();
+            boolean ok = m.run(srcDir.getPath(), destDir, classNames);
+            if (!ok)
+                throw new BuildException("genstubs failed");
+        } else {
+            List<String> cmd = new ArrayList<String>();
+            String java_home = System.getProperty("java.home");
+            cmd.add(new File(new File(java_home, "bin"), "java").getPath());
+            if (classpath != null)
+                cmd.add("-Xbootclasspath/p:" + classpath);
+            cmd.add(GenStubs.class.getName());
+            cmd.add("-sourcepath");
+            cmd.add(srcDir.getPath());
+            cmd.add("-s");
+            cmd.add(destDir.getPath());
+            cmd.addAll(classNames);
+            //System.err.println("GenStubs exec " + cmd);
+            ProcessBuilder pb = new ProcessBuilder(cmd);
+            pb.redirectErrorStream(true);
+            try {
+                Process p = pb.start();
+                BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
+                try {
+                    String line;
+                    while ((line = in.readLine()) != null)
+                        System.out.println(line);
+                } finally {
+                    in.close();
+                }
+                int rc = p.waitFor();
+                if (rc != 0)
+                    throw new BuildException("genstubs failed");
+            } catch (IOException e) {
+                throw new BuildException("genstubs failed", e);
+            } catch (InterruptedException e) {
+                throw new BuildException("genstubs failed", e);
+            }
+        }
+    }
+    
+    String[] filter(File srcDir, File destDir, String[] files) {
+        List<String> results = new ArrayList<String>();
+        for (String f: files) {
+            long srcTime = new File(srcDir, f).lastModified();
+            long destTime = new File(destDir, f).lastModified();
+            if (srcTime > destTime)
+                results.add(f);
+        }
+        return results.toArray(new String[results.size()]);
+    }
+}