IntelliJ IDEA Messaging infrastructure with return Value

Hi, how can i use the IntelliJ IDEA Messaging infrastructure with return Value?

When i try to pass some value thru it ends up with:

[   9980]  ERROR - com.intellij.ide.IdeEventQueue - Error during dispatching of java.awt.event.MouseEvent[MOUSE_RELEASED,(86,506),absolute(2531,655),button=1,modifiers=Button1,clickCount=1] on win0 
java.lang.ClassCastException: java.lang.Object cannot be cast to [Ljavax.swing.tree.TreePath;
     at com.sun.proxy.$Proxy82.getTreePath(Unknown Source)
     at TFS.actions.SetPropertyAction.actionPerformed(SetPropertyAction.java:54)
     at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:256)
     at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:892)
     at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:114)
     at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:227)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
     at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:101)
     at com.intellij.ui.plaf.beg.BegMenuItemUI.a(BegMenuItemUI.java:512)
     at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:44)
     at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:532)
     at java.awt.Component.processMouseEvent(Component.java:6505)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
     at java.awt.Component.processEvent(Component.java:6270)
     at java.awt.Container.processEvent(Container.java:2229)
     at java.awt.Component.dispatchEventImpl(Component.java:4861)
     at java.awt.Container.dispatchEventImpl(Container.java:2287)
     at java.awt.Component.dispatchEvent(Component.java:4687)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
     at java.awt.Container.dispatchEventImpl(Container.java:2273)
     at java.awt.Window.dispatchEventImpl(Window.java:2719)
     at java.awt.Component.dispatchEvent(Component.java:4687)
     at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
     at java.awt.EventQueue.access$200(EventQueue.java:103)
     at java.awt.EventQueue$3.run(EventQueue.java:688)
     at java.awt.EventQueue$3.run(EventQueue.java:686)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
     at java.awt.EventQueue$4.run(EventQueue.java:702)
     at java.awt.EventQueue$4.run(EventQueue.java:700)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
     at com.intellij.ide.IdeEventQueue.d(IdeEventQueue.java:685)
     at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:506)
     at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:333)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
[   9982]  ERROR - com.intellij.ide.IdeEventQueue - PyCharm 2.7.1  Build #PY-125.92 
[   9982]  ERROR - com.intellij.ide.IdeEventQueue - JDK: 1.7.0_21 
[   9982]  ERROR - com.intellij.ide.IdeEventQueue - VM: OpenJDK 64-Bit Server VM 
[   9982]  ERROR - com.intellij.ide.IdeEventQueue - Vendor: Oracle Corporation 
[   9982]  ERROR - com.intellij.ide.IdeEventQueue - OS: Linux 

Here my code, everything is compileable and seems legit for me:

public interface GetTreePathNotifier {
  Topic<GetTreePathNotifier> GET_TREE_PATH_NOTIFIER_TOPIC = Topic.create("GetTreePath", GetTreePathNotifier.class);
  TreePath[] getTreePath();
}

    MessageBus bus =  ProjectManager.getInstance().getDefaultProject().getMessageBus();
    final GetTreePathNotifier c = bus.syncPublisher(GetTreePathNotifier.GET_TREE_PATH_NOTIFIER_TOPIC);


    for(TreePath p :(TreePath[])c.getTreePath())
    {
      DefaultMutableTreeNode DMTN = (DefaultMutableTreeNode) p.getLastPathComponent();
      System.out.println(DMTN.getUserObject().toString());
    }

    connection.subscribe(GetTreePathNotifier.GET_TREE_PATH_NOTIFIER_TOPIC,new GetTreePathNotifier() {
      @Override
      public TreePath[] getTreePath()
      {
        return myTree.getCheckingPaths();
      }
    });