In order to share session cookies between subdomains in your Java web application hosted with Apache Tomcat, you need to make a simple configuration change. What you simply need to do is to make a small change to your web application’s context. You might have more than one context if you have more than one… read more
This is going to be a quick one. I just want to show you how one can define a bean in Spring Framework for multiple profiles. That is, the bean will be “active” if the active profile is one in a given list. This is for example useful if you want different beans to be available at… read more
If you try to bind JSON to an object in Spring MVC with Jackson, then you might have seen the below error before. Could not read JSON: Unrecognized field \”something\” (class com.codingexplained.user.dto.account), not marked as ignorable […] This error occurs whenever an unknown field is encountered in the JSON; that is, a field specified in the JSON is not… read more
If you wish to deploy your application to Amazon’s Elastic Beanstalk, then you can customize your server setup by placing configuration files within a .ebextensions directory within the root of your .war file (for web applications). These files can then contain various kinds of instructions. One can install packages with package managers such as yum or… read more
If you have packaged a web application within a .war file, then you might want to check the contents of it for various reasons. There are a number of tools that can do this, but I am going to show you a simple command that can display the contents of the war file within the… read more
Need to pass a date as a java.util.Date instance in a Spring MVC controller action? Then you have come to the right place. You might have tried the below approach and encountered a good old 404 Not Found error. @Controller public class CompanyController { @RequestMapping("/company/added-since/{since}") public String showAddedSince(@PathVariable("since") Date since) { return "companies-added-since"; } }… read more
There are quite a few approaches to validating whether or not a given value already exists in a data store or not. In this article, I will show my solution to this problem by using Hibernate Validator in combination with Spring Framework. As you will see, the latter is solely used for injecting a dependency into… read more
If you are trying to bind a Spring MVC form to a bean, then you might have come across the below exception. Neither BindingResult nor plain target object for bean name ‘mybean’ available as request attribute Some tutorials claim that you can do like this: @Controller public class PersonController { @RequestMapping(value = "/person/add", method =… read more
Sometimes you may want to return an empty JSON object from a Spring Framework controller action, be it in a REST API or just a regular controller action. This could for example be the case if you are issuing an AJAX request from jQuery; if you specify the data type to be JSON, the success handler… read more
Generally speaking, view helpers should not be used within controllers, as the name suggests. Certain situations may, however, require one to do so. This article shows you just how to do that by fetching the view helper manager from the service manager. It is actually very simple. public function someAction() { $userData = ‘User data… read more