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Compressed OOPs in the JVM 1. Overview The JVM manages memory for us. This removes the memory management burden from the developers, so we don’t need to manipulate object pointers manually, which is proven to be time consuming and error-prone. Under the hood, the JVM incorporates a lot of nifty… Continue Reading jvm-compressed-oops
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Check If a String Is Numeric in Java 1. Introduction Oftentimes while operating upon Strings, we need to figure out whether a String is a valid number or not. In this tutorial, we’ll explore multiple ways to detect if the given String is numeric, first using plain Java, then regular expressions and finally… Continue Reading java-check-string-number
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Quick Use of FilenameFilter 1. Introduction Java has had functional interfaces before the addition of the informative annotation, @FunctionalInterface. FilenameFilter is one such interface. We’ll be taking a brief look at its usage and understand where it fits in the world of Java today. 2. FilenameFilter Since this is a… Continue Reading java-filename-filter
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Copying Sets in Java 1. Overview Simply put, a Set is a collection that contains no duplicate elements. In Java, Set is an interface that extends the Collection interface. In this quick tutorial, we’ll go through different ways of copying sets in Java. 2. Copy Constructor One way of copying… Continue Reading java-copy-sets
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Spring Session with JDBC 1. Overview In this quick tutorial, we’ll learn how to use the Spring session JDBC to persist session information to a database. For demonstration purposes, we’ll be using an in-memory H2 database. 2. Configuration Options The easiest and fastest way to create our sample project is… Continue Reading spring-session-jdbc
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ETL with Spring Cloud Data Flow 1. Overview Spring Cloud Data Flow is a cloud-native toolkit for building real-time data pipelines and batch processes. Spring Cloud Data Flow is ready to be used for a range of data processing use cases like simple import/export, ETL processing, event streaming, and predictive analytics. In… Continue Reading spring-cloud-data-flow-etl
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Java Web Weekly, Issue 142 At the very beginning of last year, I decided to track my reading habits and share the best stuff here, on Baeldung. Haven’t missed a review since. Here we go… 1. Java and Spring ===== >> Redmonk Analyzes Java Framework Popularity [infoq.com] Quick and very… Continue Reading java-web-weekly-142
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A Guide to Unirest 1. Overview Unirest is a lightweight HTTP client library from Mashape. Along with Java, it’s also available for Node.js, .Net, Python, Ruby, etc. Before we jump in, note that we’ll use mocky.io for all our HTTP requests here. 2. Maven Setup To get started, let’s add… Continue Reading unirest
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Building DSLs in Kotlin 1. Overview In this tutorial, we’ll see how powerful Kotlin language features can be used for building type-safe DSLs. For our example, we’ll create a simple tool for constructing SQL queries, just big enough to illustrate the concept. The general idea is to use statically-typed user-provided… Continue Reading kotlin-dsl
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Jackson – Working with Maps and nulls 1. Overview In this quick article, we’re going to look at a more advanced use-case of using Jackson – working with Maps that contain null values or null keys. 2. Ignore Nulls Values in a Map Jackson has a simple but useful way… Continue Reading jackson-map-null-values-or-null-key
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