Program: 54915
Project: 54915
Buggy source:
@Override public void init(){
  super.init();
  contactService=new InMemoryContactService();
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      System.out.println("String_Node_Str" + request.getUri());
      chain.next();
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      if (request.getSession().getAttribute("String_Node_Str") == null) {
        request.getSession().setAttribute("String_Node_Str",request.getUri());
        request.getSession().setAttribute("String_Node_Str","String_Node_Str");
        response.redirect("String_Node_Str");
      }
 else {
        chain.next();
      }
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      response.redirect("String_Node_Str");
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      Map<String,Object> model=new HashMap<String,Object>();
      model.put("String_Node_Str",contactService.getContacts());
      response.render("String_Node_Str",model);
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      int id=request.getParameter("String_Node_Str").toInt(0);
      String action=request.getParameter("String_Node_Str").toString("String_Node_Str");
      if ("String_Node_Str".equals(action)) {
        contactService.delete(id);
        response.redirect("String_Node_Str");
        return;
      }
      Contact contact=(id > 0) ? contactService.getContact(id) : new Contact();
      Map<String,Object> model=new HashMap<String,Object>();
      model.put("String_Node_Str",contact);
      StringBuilder editAction=new StringBuilder();
      editAction.append("String_Node_Str");
      if (id > 0) {
        editAction.append("String_Node_Str");
        editAction.append(id);
      }
      model.put("String_Node_Str",editAction);
      model.put("String_Node_Str","String_Node_Str");
      response.render("String_Node_Str",model);
    }
  }
);
  POST("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      String action=request.getParameter("String_Node_Str").toString();
      if ("String_Node_Str".equals(action)) {
        Contact contact=new Contact();
        contact.setId(request.getParameter("String_Node_Str").toInt(-1));
        contact.setName(request.getParameter("String_Node_Str").toString());
        contact.setPhone(request.getParameter("String_Node_Str").toString());
        contact.setAddress(request.getParameter("String_Node_Str").toString());
        contactService.save(contact);
        response.redirect("String_Node_Str");
      }
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      Map<String,Object> model=new HashMap<String,Object>();
      String error=(String)request.getSession().getAttribute("String_Node_Str");
      request.getSession().removeAttribute("String_Node_Str");
      if (error != null) {
        model.put("String_Node_Str",error);
      }
      response.render("String_Node_Str",model);
    }
  }
);
  POST("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      String username=request.getParameter("String_Node_Str").toString();
      String password=request.getParameter("String_Node_Str").toString();
      if (authenticate(username,password)) {
        request.getSession().setAttribute("String_Node_Str",username);
        String originalDestination=(String)request.getSession().getAttribute("String_Node_Str");
        response.redirect(originalDestination != null ? originalDestination : "String_Node_Str");
      }
 else {
        request.getSession().setAttribute("String_Node_Str","String_Node_Str");
        response.redirect("String_Node_Str");
      }
    }
    private boolean authenticate(    String username,    String password){
      return !username.isEmpty() && !password.isEmpty();
    }
  }
);
}

Fixed version (ground truth):
@Override public void init(){
  super.init();
  contactService=new InMemoryContactService();
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      System.out.println("String_Node_Str" + request.getUri());
      chain.next();
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      if (request.getSession().getAttribute("String_Node_Str") == null) {
        request.getSession().setAttribute("String_Node_Str",request.getUri());
        response.redirect("String_Node_Str");
      }
 else {
        chain.next();
      }
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      response.redirect("String_Node_Str");
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      Map<String,Object> model=new HashMap<String,Object>();
      model.put("String_Node_Str",contactService.getContacts());
      response.render("String_Node_Str",model);
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      int id=request.getParameter("String_Node_Str").toInt(0);
      String action=request.getParameter("String_Node_Str").toString("String_Node_Str");
      if ("String_Node_Str".equals(action)) {
        contactService.delete(id);
        response.redirect("String_Node_Str");
        return;
      }
      Contact contact=(id > 0) ? contactService.getContact(id) : new Contact();
      Map<String,Object> model=new HashMap<String,Object>();
      model.put("String_Node_Str",contact);
      StringBuilder editAction=new StringBuilder();
      editAction.append("String_Node_Str");
      if (id > 0) {
        editAction.append("String_Node_Str");
        editAction.append(id);
      }
      model.put("String_Node_Str",editAction);
      model.put("String_Node_Str","String_Node_Str");
      response.render("String_Node_Str",model);
    }
  }
);
  POST("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      String action=request.getParameter("String_Node_Str").toString();
      if ("String_Node_Str".equals(action)) {
        Contact contact=new Contact();
        contact.setId(request.getParameter("String_Node_Str").toInt(-1));
        contact.setName(request.getParameter("String_Node_Str").toString());
        contact.setPhone(request.getParameter("String_Node_Str").toString());
        contact.setAddress(request.getParameter("String_Node_Str").toString());
        contactService.save(contact);
        response.redirect("String_Node_Str");
      }
    }
  }
);
  GET("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      Map<String,Object> model=new HashMap<String,Object>();
      String error=(String)request.getSession().getAttribute("String_Node_Str");
      request.getSession().removeAttribute("String_Node_Str");
      if (error != null) {
        model.put("String_Node_Str",error);
      }
      response.render("String_Node_Str",model);
    }
  }
);
  POST("String_Node_Str",new RouteHandler(){
    @Override public void handle(    Request request,    Response response,    RouteHandlerChain chain){
      String username=request.getParameter("String_Node_Str").toString();
      String password=request.getParameter("String_Node_Str").toString();
      if (authenticate(username,password)) {
        request.getSession().setAttribute("String_Node_Str",username);
        String originalDestination=(String)request.getSession().getAttribute("String_Node_Str");
        response.redirect(originalDestination != null ? originalDestination : "String_Node_Str");
      }
 else {
        request.getSession().setAttribute("String_Node_Str","String_Node_Str");
        response.redirect("String_Node_Str");
      }
    }
    private boolean authenticate(    String username,    String password){
      return !username.isEmpty() && !password.isEmpty();
    }
  }
);
}