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Guide to the Synchronized Keyword in Java 1. Overview This quick article will be an intro to using the synchronized block in Java. Simply put, in a multi-threaded environment, a race condition occurs when two or more threads attempt to update mutable shared data at the same time. Java offers… Continue Reading java-synchronized
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How to Register a Servlet in Java 1. Introduction This article will provide an overview of how to register a servlet within Java EE and Spring Boot. Specifically, we will look at two ways to register a Java Servlet in Java EE — one using a web.xml file, and the… Continue Reading register-servlet
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Java 9 Migration Issues and Resolutions 1. Overview The Java platform used to have a monolithic architecture, bundling all packages as a single unit. In Java 9, this was streamlined with the introduction of the Java Platform Module System (JPMS), or Modules for short. Related packages were grouped under modules,… Continue Reading java-9-migration-issue
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Unsatisfied Dependency in Spring 1. Overview In this quick tutorial, we’ll explain Spring’s UnsatisfiedDependencyException, what causes it, and how to avoid it. 2. Cause of UnsatisfiedDependencyException UnsatisfiedDependencyException gets thrown when, as the name suggests, some bean or property dependency isn’t satisfied. This may happen when Spring application tries to wire a bean and cannot… Continue Reading spring-unsatisfied-dependency
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AWS Lambda Using DynamoDB With Java 1. Introduction AWS Lambda is serverless computing service provided by Amazon Web Services and WS DynamoDB is a NoSQL database service also provided by Amazon. Interestingly, DynamoDB supports both document store and key-value store and is fully managed by AWS. Before we start, note… Continue Reading aws-lambda-dynamodb-java
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Spring Request Parameters with Thymeleaf 1. Introduction In our article Introduction to Using Thymeleaf in Spring, we saw how to bind user input to objects. We used th:object and th:field in the Thymeleaf template and @ModelAttribute in the controller to bind data to a Java object. In this article, we’ll look… Continue Reading spring-thymeleaf-request-parameters
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Counting Sort in Java 1. Overview General-purpose sorting algorithms like Merge Sort make no assumption about the input, so they can’t beat the O(n log n) in the worst case. Counting Sort, on the contrary, has an assumption about the input which makes it a linear time sorting algorithm. In this… Continue Reading java-counting-sort
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Mapping a Dynamic JSON Object with Jackson 1. Introduction Working with predefined JSON data structures with Jackson is straightforward. However, sometimes we need to handle dynamic JSON objects, which have unknown properties. In this short tutorial, we’ll see multiple ways of mapping dynamic JSON objects into Java classes. Note that in… Continue Reading jackson-mapping-dynamic-object
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Configuring a DataSource Programmatically in Spring Boot 1. Overview Spring Boot uses an opinionated algorithm to scan for and configure a DataSource. This allows us to easily get a fully-configured DataSource implementation by default. In addition, Spring Boot automatically configures a lightning-fast connection pool — either HikariCP, Apache Tomcat, or Commons DBCP, in… Continue Reading spring-boot-configure-data-source-programmatic
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Logout in an OAuth Secured Application 1. Overview In this quick tutorial, we’re going to show how we can add logout functionality to an OAuth Spring Security application. We’ll, of course, use the OAuth application described in a previous article – Creating a REST API with OAuth2. 2. Remove the… Continue Reading logout-spring-security-oauth
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