Issue #3413 was fixed.

server/src/main/java/com/orientechnologies/orient/server/OServer.java

@@ -114,9 +114,17 @@ public class OServer {
   private Map<String, Object>                              variables              = new HashMap<String, Object>();
   private String                                           serverRootDirectory;
   private String                                           databaseDirectory;
+  private final boolean                                    shutdownEngineOnExit;
 
   public OServer() throws ClassNotFoundException, MalformedObjectNameException, NullPointerException,
       InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException {
+    this(true);
+  }
+
+  public OServer(boolean shutdownEngineOnExit) throws ClassNotFoundException, MalformedObjectNameException, NullPointerException,
+      InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException {
+    this.shutdownEngineOnExit = shutdownEngineOnExit;
+
     serverRootDirectory = OSystemVariableResolver.resolveSystemVariables("${" + Orient.ORIENTDB_HOME + "}", ".");
 
     OLogManager.installCustomFormatter();
@@ -347,7 +355,7 @@ public boolean shutdown() {
       lock.unlock();
     }
 
-    if (!Orient.isRegisterDatabaseByPath())
+    if (shutdownEngineOnExit && !Orient.isRegisterDatabaseByPath())
       try {
         OLogManager.instance().info(this, "Shutting down databases:");
         Orient.instance().shutdown();

server/src/main/java/com/orientechnologies/orient/server/OServerMain.java

@@ -1,38 +1,43 @@
 /*
-      *
-      *  *  Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
-      *  *
-      *  *  Licensed under the Apache License, Version 2.0 (the "License");
-      *  *  you may not use this file except in compliance with the License.
-      *  *  You may obtain a copy of the License at
-      *  *
-      *  *       http://www.apache.org/licenses/LICENSE-2.0
-      *  *
-      *  *  Unless required by applicable law or agreed to in writing, software
-      *  *  distributed under the License is distributed on an "AS IS" BASIS,
-      *  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-      *  *  See the License for the specific language governing permissions and
-      *  *  limitations under the License.
-      *  *
-      *  * For more information: http://www.orientechnologies.com
-      *
-      */
+ *
+ *  *  Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
+ *  *
+ *  *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  *  you may not use this file except in compliance with the License.
+ *  *  You may obtain a copy of the License at
+ *  *
+ *  *       http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  *  Unless required by applicable law or agreed to in writing, software
+ *  *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  *  See the License for the specific language governing permissions and
+ *  *  limitations under the License.
+ *  *
+ *  * For more information: http://www.orientechnologies.com
+ *
+ */
 package com.orientechnologies.orient.server;
 
 public class OServerMain {
-   private static OServer instance;
+  private static OServer instance;
 
-   public static OServer create() throws Exception {
-     instance = new OServer();
-     return instance;
-   }
+  public static OServer create() throws Exception {
+    instance = new OServer();
+    return instance;
+  }
 
-   public static OServer server() {
-     return instance;
-   }
+  public static OServer create(boolean shutdownEngineOnExit) throws Exception {
+    instance = new OServer(shutdownEngineOnExit);
+    return instance;
+  }
 
-   public static void main(final String[] args) throws Exception {
-     instance = OServerMain.create();
-     instance.startup().activate();
-   }
- }
+  public static OServer server() {
+    return instance;
+  }
+
+  public static void main(final String[] args) throws Exception {
+    instance = OServerMain.create();
+    instance.startup().activate();
+  }
+}

server/src/main/java/com/orientechnologies/orient/server/OServerShutdownHook.java

@@ -22,10 +22,10 @@
 import com.orientechnologies.orient.core.Orient;
 
 public class OServerShutdownHook extends Thread {
-   private OServer server;
+   private final OServer server;
 
-   protected OServerShutdownHook(final OServer iServer) {
-     server = iServer;
+   protected OServerShutdownHook(final OServer server) {
+     this.server = server;
      Orient.instance().removeShutdownHook();
      Runtime.getRuntime().addShutdownHook(this);
    }