--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/api/TestJavacTask_Lock.java	Mon Mar 14 11:48:41 2011 -0700
@@ -0,0 +1,111 @@
+/*
+ * 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 7026509
+ * @summary Cannot use JavaCompiler to create multiple CompilationTasks for partial compilations
+ */
+
+import java.io.*;
+import java.util.*;
+import javax.tools.*;
+import javax.tools.JavaCompiler.CompilationTask;
+import com.sun.source.util.*;
+
+public class TestJavacTask_Lock {
+    public static void main(String... args) throws Exception {
+        new TestJavacTask_Lock().run();
+    }
+
+    enum MethodKind {
+        CALL {
+            int test(CompilationTask t) {
+                boolean ok = t.call();
+                if (!ok)
+                    throw new Error("compilation failed");
+                return 1;
+            }
+        },
+        PARSE {
+            int test(CompilationTask t) {
+                try {
+                    ((JavacTask) t).parse();
+                return 1;
+                } catch (IOException ex) {
+                    throw new Error(ex);
+                }
+            }
+
+        };
+        abstract int test(CompilationTask t);
+    }
+
+    JavaCompiler comp;
+    StandardJavaFileManager fm;
+
+    void run() throws Exception {
+        comp = ToolProvider.getSystemJavaCompiler();
+        fm = comp.getStandardFileManager(null, null, null);
+
+        for (MethodKind first: MethodKind.values()) {
+            for (MethodKind second: MethodKind.values()) {
+                test(first, second);
+            }
+        }
+
+        if (errors > 0)
+            throw new Exception(errors + " errors found");
+    }
+
+    void test(MethodKind first, MethodKind second) {
+        System.err.println("test: " + first + ", " + second);
+        File testSrc = new File(System.getProperty("test.src"));
+        String thisClassName = TestJavacTask_Lock.class.getName();
+        Iterable<? extends JavaFileObject> files =
+                fm.getJavaFileObjects(new File(testSrc, thisClassName + ".java"));
+        File tmpDir = new File(first + "_" + second);
+        tmpDir.mkdirs();
+        List<String> options = Arrays.asList( "-d", tmpDir.getPath() );
+        CompilationTask t = comp.getTask(null, fm, null, options, null, files);
+
+        try {
+            first.test(t);
+            second.test(t);
+            error("No exception thrown");
+        } catch (IllegalStateException e) {
+            System.err.println("Expected exception caught: " + e);
+        } catch (Exception e) {
+            error("Unexpected exception caught: " + e);
+            e.printStackTrace(System.err);
+        }
+
+    }
+
+    void error(String msg) {
+        System.err.println("Error: " + msg);
+        errors++;
+    }
+
+    int errors;
+}