Try to use current java executable path, not the one in %PATH% (there could be a…

Try to use current java executable path, not the one in %PATH% (there could be a reference to an old one)

h2/src/tools/org/h2/dev/util/Migrate.java

@@ -61,6 +61,7 @@ public class Migrate {
      * @throws Exception if conversion fails
      */
     public void execute(File file, boolean recursive, String user, String password, boolean runQuiet) throws Exception {
+        String pathToJavaExe = getJavaExecutablePath();
         this.quiet = runQuiet;
         if (file.isDirectory() && recursive) {
             for (File f : file.listFiles()) {
@@ -78,7 +79,7 @@ public class Migrate {
         String url = "jdbc:h2:" + file.getAbsolutePath();
         url = url.substring(0, url.length() - ".data.db".length());
         exec(new String[] {
-                "java",
+                pathToJavaExe,
                 "-Xmx128m",
                 "-cp", OLD_H2_FILE.getAbsolutePath(),
                 "org.h2.tools.Script",
@@ -92,6 +93,20 @@ public class Migrate {
         new File(TEMP_SCRIPT).delete();
     }
 
+    private String getJavaExecutablePath() {
+        String pathToJava;
+        if (File.separator.equals("\\")) {
+            pathToJava = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java.exe";
+        } else {
+            pathToJava = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";
+        }
+        if (!new File(pathToJava).exists()) {
+            // Fallback to old behaviour
+            pathToJava = "java";
+        }
+        return pathToJava;
+    }
+
     private void download(String target, String fileURL, String sha1Checksum) {
         File targetFile = new File(target);
         if (targetFile.exists()) {