Added the Version method to executor

client/driver/java.go

@@ -254,6 +254,8 @@ func (d *JavaDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, erro
 		return nil, fmt.Errorf("error connecting to plugin: %v", merrs.ErrorOrNil())
 	}
 
+	d.logger.Printf("[DEBUG] driver.java: version of executor: %v", exec.Version())
+
 	// Return a driver handle
 	h := &javaHandle{
 		pluginClient:    pluginClient,