--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/classfiles/ClassVersionChecker.java	Fri Apr 06 10:10:44 2012 -0700
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2012, 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 7157626
+ * @summary Test major version for all legal combinations for -source and -target
+ * @author sgoel
+ *
+ */
+
+import java.io.*;
+import java.nio.*;
+import java.util.*;
+import java.util.regex.*;
+
+public class ClassVersionChecker {
+
+    int errors;
+    String[] jdk = {"","1.2","1.3","1.4","1.5","1.6","1.7","1.8"};
+    File javaFile = null;
+
+    public static void main(String[] args) throws Throwable {
+        new ClassVersionChecker().run();
+    }
+
+    void run() throws Exception {
+        writeTestFile();
+        /* Rules applicable for -source and -target combinations
+         * 1. If both empty, version num is for 1.7
+         * 2. If source is not empty and target is empty, version is based on source
+         * 3. If both non-empty, version is based on target
+         */
+
+        /* -source (0=>empty,1=>1.2,...) X -target (0=>empty,1=>1.2,...)
+         * ver[0][0] => no -source or -target was given
+         * -1 => invalid combinations
+         */
+        int[][] ver =
+                {{51, -1, -1, -1, -1, -1, -1, -1},
+                 {48, 46, 47, 48, 49, 50, 51, 51},
+                 {48, 46, 47, 48, 49, 50, 51, 51},
+                 {48, -1, -1, 48, 49, 50, 51, 51},
+                 {51, -1, -1, -1, 49, 50, 51, 51},
+                 {51, -1, -1, -1, -1, 50, 51, 51},
+                 {51, -1, -1, -1, -1, -1, 51, 51},
+                 {51, -1, -1, -1, -1, -1, -1, 51}};
+
+        // Loop to run all possible combinations of source/target values
+        for (int i = 0; i< ver.length; i++) {
+            for (int j = 0 ; j< ver[i].length; j++) {
+                if(ver[i][j] != -1) {
+                    logMsg("Index values for i = " + i + " j = " + j);
+                    logMsg("Running for src = " + jdk[i] + " target = "+jdk[j] +" expected = " + ver[i][j]);
+                    test(i,j, ver[i][j]);
+                }
+            }
+        }
+
+        if (errors > 0)
+            throw new Exception(errors + " errors found");
+    }
+
+    void test (int i, int j, int expected) {
+        File classFile = compileTestFile(i, j, javaFile);
+        short majorVer = getMajorVersion(classFile);
+        checkVersion(majorVer, expected);
+    }
+
+    void writeTestFile() throws IOException {
+        javaFile = new File("Test.java");
+        try(PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(javaFile)));) {
+            out.println("class Test { ");
+            out.println("  public void foo() { }");
+            out.println("}");
+        } catch (IOException ioe) {
+            error("IOException while creating Test.java" + ioe);
+        }
+    }
+
+    File compileTestFile(int i , int j, File f) {
+        int rc = -1;
+        // Src and target are empty
+        if (i == 0 && j == 0 ) {
+            rc = compile("-g", f.getPath());
+        } else if( j == 0 ) {  // target is empty
+            rc = compile("-source", jdk[i], "-g", f.getPath());
+        } else {
+            rc = compile("-source", jdk[i], "-target", jdk[j], "-g", f.getPath());
+        }
+        if (rc != 0)
+            throw new Error("compilation failed. rc=" + rc);
+        String path = f.getPath();
+        return new File(path.substring(0, path.length() - 5) + ".class");
+    }
+
+    int compile(String... args) {
+        return com.sun.tools.javac.Main.compile(args);
+    }
+
+    void logMsg (String str) {
+        System.out.println(str);
+    }
+
+    short getMajorVersion(File f) {
+        List<String> args = new ArrayList<String>();
+        short majorVer = 0;
+        try(DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(f)));) {
+            in.readInt();
+            in.readShort();
+            majorVer = in.readShort();
+            System.out.println("major version:" +  majorVer);
+        } catch (IOException e) {
+            error("IOException while reading Test.class" + e);
+        }
+        return majorVer;
+    }
+
+    void checkVersion(short majorVer, int expected) {
+        if (majorVer != expected ) {
+            error("versions did not match, Expected: " + expected + "Got: " + majorVer);
+        }
+    }
+
+    void error(String msg) {
+       System.out.println("error: " + msg);
+       errors++;
+    }
+}