Program: 95243
Project: 95243
Buggy source:
public void handleSubscribeRequest(final ID fromID,IPresence presence){
  Display.getDefault().syncExec(new Runnable(){
    public void run(){
      try {
        IWorkbenchWindow ww=PlatformUI.getWorkbench().getActiveWorkbenchWindow();
        AuthorizeRequest authRequest=new AuthorizeRequest(ww.getShell(),fromID.getName(),localUser.getName());
        authRequest.open();
        int res=authRequest.getButtonPressed();
        if (res == AuthorizeRequest.AUTHORIZE_AND_ADD) {
          if (presenceSender != null) {
            presenceSender.sendPresenceUpdate(localUser,fromID,new Presence(IPresence.Type.SUBSCRIBED));
            if (rosterView != null) {
              String[] groupNames=rosterView.getGroupNames();
            }
            presenceSender.sendPresenceUpdate(localUser,fromID,new Presence(IPresence.Type.SUBSCRIBE));
          }
        }
 else         if (res == AuthorizeRequest.AUTHORIZE_ID) {
          if (presenceSender != null) {
            presenceSender.sendPresenceUpdate(localUser,fromID,new Presence(IPresence.Type.SUBSCRIBED));
          }
        }
 else         if (res == AuthorizeRequest.REFUSE_ID) {
          System.out.println("String_Node_Str");
        }
 else {
          System.out.println("String_Node_Str");
        }
      }
 catch (      Exception e) {
        IStatus status=new Status(IStatus.ERROR,ClientPlugin.PLUGIN_ID,IStatus.OK,"String_Node_Str",e);
        ClientPlugin.getDefault().getLog().log(status);
      }
    }
  }
);
}

Fixed version (ground truth):
public void handleSubscribeRequest(final ID fromID,IPresence presence){
  Display.getDefault().syncExec(new Runnable(){
    public void run(){
      try {
        IWorkbenchWindow ww=PlatformUI.getWorkbench().getActiveWorkbenchWindow();
        ReceiveAuthorizeRequestDialog authRequest=new ReceiveAuthorizeRequestDialog(ww.getShell(),fromID.getName(),localUser.getName());
        authRequest.setBlockOnOpen(true);
        authRequest.open();
        int res=authRequest.getButtonPressed();
        if (res == ReceiveAuthorizeRequestDialog.AUTHORIZE_AND_ADD) {
          if (presenceSender != null) {
            presenceSender.sendPresenceUpdate(localUser,fromID,new Presence(IPresence.Type.SUBSCRIBED));
            if (rosterView != null) {
              String[] groupNames=rosterView.getGroupNames();
              List g=Arrays.asList(groupNames);
              String selectedGroup=rosterView.getSelectedGroupName();
              int selected=(selectedGroup == null) ? -1 : g.indexOf(selectedGroup);
              AddBuddyDialog sg=new AddBuddyDialog(ww.getShell(),fromID.getName(),groupNames,selected);
              sg.open();
              if (sg.getReturnCode() == Window.OK) {
                String group=sg.getGroup();
                String user=sg.getUser();
                String nickname=sg.getNickname();
                sg.close();
                if (!g.contains(group)) {
                  rosterView.addGroup(group);
                }
                presenceSender.sendRosterAdd(localUser,user,nickname,new String[]{group});
              }
            }
          }
        }
 else         if (res == ReceiveAuthorizeRequestDialog.AUTHORIZE_ID) {
          if (presenceSender != null) {
            presenceSender.sendPresenceUpdate(localUser,fromID,new Presence(IPresence.Type.SUBSCRIBED));
          }
        }
 else         if (res == ReceiveAuthorizeRequestDialog.REFUSE_ID) {
          System.out.println("String_Node_Str");
        }
 else {
          System.out.println("String_Node_Str");
        }
      }
 catch (      Exception e) {
        IStatus status=new Status(IStatus.ERROR,ClientPlugin.PLUGIN_ID,IStatus.OK,"String_Node_Str",e);
        ClientPlugin.getDefault().getLog().log(status);
      }
    }
  }
);
}