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JDBC with Groovy 1. Introduction In this article, we’re going to look at how to query relational databases with JDBC, using idiomatic Groovy. JDBC, while relatively low-level, is the foundation of most ORMs and other high-level data access libraries on the JVM. And we can use JDBC directly in Groovy,… Continue Reading jdbc-groovy
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PubSub Messaging with Spring Data Redis 1. Overview In this second article from the series exploring Spring Data Redis, we’ll have a look at the pub/sub message queues. In Redis, publishers are not programmed to send their messages to specific subscribers. Rather, published messages are characterized into channels, without knowledge… Continue Reading spring-data-redis-pub-sub
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GridFS in Spring Data MongoDB 1. Overview This tutorial will explore one of the core features of Spring Data MongoDB: interacting with *GridFS*. The GridFS storage spec is mainly used for working with files that exceed the BSON-document size limit of 16MB. And Spring Data provides a GridFsOperations interface and… Continue Reading spring-data-mongodb-gridfs
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Java – Append Data to a File 1. Introduction In this quick tutorial, we’ll see how we use Java to append data to the content of a file – in a few simple ways. Let’s start with how we can do this using core Java’s FileWriter. 2. Using FileWriter Here’s… Continue Reading java-append-to-file
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Context Hierarchy with the Spring Boot Fluent Builder API 1. Overview It’s possible to create separate contexts and organize them in a hierarchy in Spring Boot. A context hierarchy can be defined in different ways in Spring Boot application. In this article, we’ll look at how we can create multiple… Continue Reading spring-boot-context-hierarchy
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Guide to the Java TransferQueue 1. Overview In this article, we’ll be looking at the TransferQueue construct from the standard java.util.concurrent package. Simply put, this queue allows us to create programs according to the producer-consumer pattern, and coordinate messages passing from producers to consumers. The implementation is actually similar to… Continue Reading java-transfer-queue
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Remote Code Execution with XStream 1. Overview In this tutorial, we’ll dissect a Remote Code Execution attack against the XStream XML serialization library. This exploit falls into the untrusted deserialization category of attacks. We’ll learn when XStream is vulnerable to this attack, how the attack works, and how to prevent… Continue Reading java-xstream-remote-code-execution
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Http Message Converters with the Spring Framework 1. Overview This article describes how to Configure HttpMessageConverters in Spring. Simply put, we can use message converters to marshall and unmarshall Java Objects to and from JSON, XML, etc – over HTTP. Further reading: Spring MVC Content Negotiation A guide to configuring… Continue Reading spring-httpmessageconverter-rest
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Java Weekly, Issue 272 Here we go… 1. Spring and Java ===== >> Memory footprint of the JVM [spring.io] A nice write-up on heap vs non-heap memory, native memory areas, challenges of sizing the JVM, and how Spring minimizes its own memory footprint. >> Spring DevTools with Jib and IntelliJ… Continue Reading java-weekly-272
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What is Thread-Safety and How to Achieve it? 1. Overview Java supports multithreading out of the box. This means that by running bytecode concurrently in separate worker threads the JVM is capable of improving the performance in applications. Although multithreading is a powerful feature, it comes at a price. In multithreaded… Continue Reading java-thread-safety
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