--- a/src/share/classes/com/sun/tools/javac/file/RegularFileObject.java	Tue Oct 11 15:48:53 2011 -0700
+++ b/src/share/classes/com/sun/tools/javac/file/RegularFileObject.java	Tue Oct 18 14:45:09 2011 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2011, 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
@@ -98,6 +98,7 @@
 
     @Override
     public OutputStream openOutputStream() throws IOException {
+        fileManager.flushCache(this);
         ensureParentDirectoriesExist();
         return new FileOutputStream(file);
     }
@@ -128,6 +129,7 @@
 
     @Override
     public Writer openWriter() throws IOException {
+        fileManager.flushCache(this);
         ensureParentDirectoriesExist();
         return new OutputStreamWriter(new FileOutputStream(file), fileManager.getEncodingName());
     }

--- a/src/share/classes/com/sun/tools/javac/nio/PathFileObject.java	Tue Oct 11 15:48:53 2011 -0700
+++ b/src/share/classes/com/sun/tools/javac/nio/PathFileObject.java	Tue Oct 18 14:45:09 2011 -0700
@@ -205,6 +205,7 @@
 
     @Override
     public OutputStream openOutputStream() throws IOException {
+        fileManager.flushCache(this);
         ensureParentDirectoriesExist();
         return Files.newOutputStream(path);
     }
@@ -241,6 +242,7 @@
 
     @Override
     public Writer openWriter() throws IOException {
+        fileManager.flushCache(this);
         ensureParentDirectoriesExist();
         return new OutputStreamWriter(Files.newOutputStream(path), fileManager.getEncodingName());
     }

--- a/src/share/classes/com/sun/tools/javac/util/BaseFileManager.java	Tue Oct 11 15:48:53 2011 -0700
+++ b/src/share/classes/com/sun/tools/javac/util/BaseFileManager.java	Tue Oct 18 14:45:09 2011 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2011, 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
@@ -322,16 +322,46 @@
 
     // <editor-fold defaultstate="collapsed" desc="Content cache">
     public CharBuffer getCachedContent(JavaFileObject file) {
-        SoftReference<CharBuffer> r = contentCache.get(file);
-        return (r == null ? null : r.get());
+        ContentCacheEntry e = contentCache.get(file);
+        if (e == null)
+            return null;
+
+        if (!e.isValid(file)) {
+            contentCache.remove(file);
+            return null;
+        }
+
+        return e.getValue();
     }
 
     public void cache(JavaFileObject file, CharBuffer cb) {
-        contentCache.put(file, new SoftReference<CharBuffer>(cb));
+        contentCache.put(file, new ContentCacheEntry(file, cb));
+    }
+
+    public void flushCache(JavaFileObject file) {
+        contentCache.remove(file);
     }
 
-    protected final Map<JavaFileObject, SoftReference<CharBuffer>> contentCache
-            = new HashMap<JavaFileObject, SoftReference<CharBuffer>>();
+    protected final Map<JavaFileObject, ContentCacheEntry> contentCache
+            = new HashMap<JavaFileObject, ContentCacheEntry>();
+
+    protected static class ContentCacheEntry {
+        final long timestamp;
+        final SoftReference<CharBuffer> ref;
+
+        ContentCacheEntry(JavaFileObject file, CharBuffer cb) {
+            this.timestamp = file.getLastModified();
+            this.ref = new SoftReference<CharBuffer>(cb);
+        }
+
+        boolean isValid(JavaFileObject file) {
+            return timestamp == file.getLastModified();
+        }
+
+        CharBuffer getValue() {
+            return ref.get();
+        }
+    }
     // </editor-fold>
 
     public static Kind getKind(String name) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/file/T7068451.java	Tue Oct 18 14:45:09 2011 -0700
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2011, 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 7068451
+ * @summary Regression: javac compiles fixed sources against previous,
+ *              not current, version of generated sources
+ */
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.Writer;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.Filer;
+import javax.annotation.processing.Messager;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.TypeElement;
+import javax.tools.Diagnostic.Kind;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.StandardLocation;
+import javax.tools.ToolProvider;
+
+public class T7068451 {
+    public static void main(String[] args) throws Exception {
+        new T7068451().run();
+    }
+
+    void run() throws Exception {
+        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
+        System.err.println("using " + compiler.getClass() + " from " + compiler.getClass().getProtectionDomain().getCodeSource());
+
+        File tmp = new File("tmp");
+        tmp.mkdir();
+        for (File f: tmp.listFiles())
+            f.delete();
+
+        File input = writeFile(tmp, "X.java", "package p; class X { { p.C.first(); } }");
+
+        List<String> opts = Arrays.asList(
+                "-s", tmp.getPath(),
+                "-d", tmp.getPath(),
+                "-XprintRounds");
+
+        System.err.println();
+        System.err.println("FIRST compilation");
+        System.err.println();
+
+        CompilationTask task = compiler.getTask(null, null, null, opts, null,
+                compiler.getStandardFileManager(null, null, null).getJavaFileObjects(input));
+        task.setProcessors(Collections.singleton(new Proc("first")));
+        check("compilation", task.call());
+
+        writeFile(tmp, "X.java", "package p; class X { { p.C.second(); } }");
+
+        //Thread.sleep(2000);
+
+        System.err.println();
+        System.err.println("SECOND compilation");
+        System.err.println();
+
+        task = compiler.getTask(null, null, null, opts, null,
+                compiler.getStandardFileManager(null, null, null).getJavaFileObjects(input));
+        task.setProcessors(Collections.singleton(new Proc("second")));
+        check("compilation", task.call());
+
+        //Thread.sleep(2000);
+
+        System.err.println();
+        System.err.println("SECOND compilation, REPEATED");
+        System.err.println();
+
+        task = compiler.getTask(null, null, null, opts, null,
+                compiler.getStandardFileManager(null, null, null).getJavaFileObjects(input));
+        task.setProcessors(Collections.singleton(new Proc("second")));
+        check("compilation", task.call());
+    }
+
+    void check(String msg, boolean ok) {
+        System.err.println(msg + ": " + (ok ? "ok" : "failed"));
+        if (!ok)
+            throw new AssertionError(msg);
+    }
+
+    static File writeFile(File base, String path, String body) throws IOException {
+        File f = new File(base, path);
+        FileWriter out = new FileWriter(f);
+        out.write(body);
+        out.close();
+        System.err.println("wrote " + path + ": " + body);
+        return f;
+    }
+
+    @SupportedAnnotationTypes("*")
+    private static class Proc extends AbstractProcessor {
+        final String m;
+        Proc(String m) {
+            this.m = m;
+        }
+
+        int count;
+        @Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+            if (roundEnv.processingOver() || count++ > 0) {
+                return false;
+            }
+
+            Filer filer = processingEnv.getFiler();
+            Messager messager = processingEnv.getMessager();
+
+            System.err.println("running Proc");
+            try {
+                int len = filer.getResource(StandardLocation.SOURCE_OUTPUT, "p", "C.java").getCharContent(false).length();
+                messager.printMessage(Kind.NOTE, "C.java: found previous content of length " + len);
+            } catch (FileNotFoundException x) {
+                messager.printMessage(Kind.NOTE, "C.java: not previously there");
+            } catch (IOException x) {
+                messager.printMessage(Kind.ERROR, "while reading: " + x);
+            }
+
+            try {
+                String body = "package p; public class C { public static void " + m + "() {} }";
+                Writer w = filer.createSourceFile("p.C").openWriter();
+                w.write(body);
+                w.close();
+                messager.printMessage(Kind.NOTE, "C.java: wrote new content: " + body);
+            } catch (IOException x) {
+                messager.printMessage(Kind.ERROR, "while writing: " + x);
+            }
+
+            return true;
+        }
+
+        @Override
+        public SourceVersion getSupportedSourceVersion() {
+            return SourceVersion.latest();
+        }
+    }
+}
+