diff -r b367473ef0f1 -r ce2780cb121f langtools/make/tools/anttasks/CompilePropertiesTask.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/make/tools/anttasks/CompilePropertiesTask.java	Wed Mar 07 13:11:27 2012 +0100
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2007, 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.  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 compileproperties.CompileProperties;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.DirectoryScanner;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.taskdefs.MatchingTask;
+
+public class CompilePropertiesTask extends MatchingTask {
+    public void setSrcDir(File srcDir) {
+        this.srcDir = srcDir;
+    }
+
+    public void setDestDir(File destDir) {
+        this.destDir = destDir;
+    }
+
+    public void setSuperclass(String superclass) {
+        this.superclass = superclass;
+    }
+
+    @Override
+    public void execute() {
+        CompileProperties.Log log = new CompileProperties.Log() {
+            public void error(String msg, Exception e) {
+                log(msg, Project.MSG_ERR);
+            }
+            public void info(String msg) {
+                log(msg, Project.MSG_INFO);
+            }
+            public void verbose(String msg) {
+                log(msg, Project.MSG_VERBOSE);
+            }
+        };
+        List<String> mainOpts = new ArrayList<String>();
+        int count = 0;
+        DirectoryScanner s = getDirectoryScanner(srcDir);
+        for (String path: s.getIncludedFiles()) {
+            if (path.endsWith(".properties")) {
+                String destPath =
+                        path.substring(0, path.length() - ".properties".length()) +
+                        ".java";
+                File srcFile = new File(srcDir, path);
+                File destFile = new File(destDir, destPath);
+                // Arguably, the comparison in the next line should be ">", not ">="
+                // but that assumes the resolution of the last modified time is fine
+                // grained enough; in practice, it is better to use ">=".
+                if (destFile.exists() && destFile.lastModified() >= srcFile.lastModified())
+                    continue;
+                destFile.getParentFile().mkdirs();
+                mainOpts.add("-compile");
+                mainOpts.add(srcFile.getPath());
+                mainOpts.add(destFile.getPath());
+                mainOpts.add(superclass);
+                count++;
+            }
+        }
+        if (mainOpts.size() > 0) {
+            log("Generating " + count + " resource files to " + destDir, Project.MSG_INFO);
+            CompileProperties cp = new CompileProperties();
+            cp.setLog(log);
+            boolean ok = cp.run(mainOpts.toArray(new String[mainOpts.size()]));
+            if (!ok)
+                throw new BuildException("CompileProperties failed.");
+        }
+    }
+
+    private File srcDir;
+    private File destDir;
+    private String superclass = "java.util.ListResourceBundle";
+}