Laurentiu Spilca

Learn how to quickly work out what your Java code is doing so you can understand when and why it misbehaves. Searching for bugs, detangling messy legacy code, or evaluating your codebase for new features sucks up much of a developer's time. Effectively reading and understanding existing code is a true superpower Troubleshooting Java, Second Edition teaches you to efficiently analyze and debug Java applications using time-tested tools and new AI-powered techniques. In Troubleshooting Java, Second Edition you'll learn: - Efficiently use debuggers to quickly understand complex code - Utilize AI-driven tools to automate log analysis, trace execution, and predict problems - Correctly implement and interpret application logs - Identify performance bottlenecks and optimize slow execution paths - Profile SQL queries to diagnose and optimize database interactions - Evaluate heap dumps to detect and fix memory leaks - Analyze thread dumps to resolve deadlocks and concurrency issues - Navigate the intricacies of service-oriented and microservices systems In Troubleshooting Java, Second Edition Java veteran Laurentiu Spilca shares techniques for reading, profiling, debugging, and optimizing Java code that he's honed over years working with high-stakes systems. This fully-revised second edition, updates coverage for new Java tools and adds methods for saving time and effort using AI. You'll master techniques to identify memory leaks, optimize database queries, and resolve threading issues with ease. The code samples are in Java, but the skills you learn in this guide can be applied to any JVM language. About the technology Whether you're working with legacy systems or using AI to generate fresh programs, you'll spend more time reading and fixing code than writing it from scratch. Troubleshooting is a messy art, and efficient profiling, logging, debugging, and optimization will save you hours of time and countless headaches. About the book Troubleshooting Java, Second Edition teaches practical techniques to diagnose, debug, and optimize Java applications. You'll learn to uncover hidden dependencies, diagnose crashes, and resolve performance issues using tools like IntelliJ IDEA Debugger, VisualVM, and Heap Dump Analyzer. This revised and updated second edition introduces AI-powered troubleshooting tools, along with techniques for modern Java and cloud-native apps. What's inside - Use debuggers to quickly understand complex code - Automate code analysis with AI tools - Implement and interpret application logs - Identify performance bottlenecks About the reader For intermediate Java developers. About the author Laurentiu Spilca is a skilled Java and Spring developer and an experienced technology instructor. He is the author of Spring Start Here and Spring Security in Action. Table of Contents Part 1 1 Starting to know your apps 2 Understanding your app's logic through debugging techniques 3 Finding problem root causes using advanced debugging techniques 4 Making the most of logs: Auditing an app's behavior Part 2 5 Identifying resource consumption problems using profiling techniques 6 Finding hidden problems using profiling techniques 7 Investigating locks in multithreaded architectures 8 Investigating deadlocks with thread dumps Part 3 9 Profiling memory-related problems 10 Investigating memory problems with heap dumps 11 Analyzing potential JVM problems with GC logs Part 4 12 Uncovering system-level failures and service communication problems 13 Measuring data consistency and transactions A Tools you'll need B Opening a project C Recommended further reading D Understanding Java threads E Memory management in Java apps Get a free eBook (PDF or ePub) from Manning as well as access to the online liveBook format (and its AI assistant that will answer your questions in any language) when you purchase the print book.

Design and develop Spring applications that are secure right from the start. In Spring Security in Action, Second Edition you will learn essential security skills including how to: Implement and customize authentication and authorizationSet up all components of an OAuth 2/OpenID Connect systemUtilize CRSF and CORS configurationsSecure Spring reactive applicationsWrite tests for security configurations About the technology Spring Security is essential for any Java developer looking to master authentication and authorization in Spring apps. By adopting "secure by design" principles with Spring Security's out-of-the-box features, you can protect your apps from data theft and unauthorized intrusions.

Effectively reading and understanding existing code is a developer's superpower. In this book, you'll master techniques for code profiling, advanced debugging, and log evaluation to find and fix bugs and performance problems. In How To Read Java: Understanding, debugging, and optimizing JVM applications you will learn how to: Determine what code does the first time you see itExpose code logic problemsEvaluate heap dumps to find memory leaksMonitor CPU consumption to optimize executionUse thread dumps to find and solve deadlocksEasily follow a service-oriented or microservices systemProperly use logging to better understand Java app executionUse Java debuggers efficiently How To Read Java: Understanding, debugging, and optimizing JVM applications teaches code investigation techniques that will help you understand how Java apps work, optimize them, and fix the bugs that break them. You'll go from the basics of debugging to advanced methods for locating problems in microservices architectures. Each new technique is explained with lively illustrations and engaging real-world examples. about the technology Tasks like searching for bugs, working through messy legacy code, and analyzing an application's readiness to support new features consume a lot of developer time. In fact, most developers spend more time trying to read and understand code than they do writing it! In this unique guide, you'll learn techniques like resolving deadlocks by examining thread dumps and locating memory leaks by inspecting the heap that will radically improve your efficiency when working with existing code in JVM languages like Java, Scala, and Kotlin.

Spring is a massive ecosystem and a must-learn tool for Java developers. Spring Start Here introduces you to Java development with Spring by concentrating on the core concepts you'll use in every application you build. You'll learn how to refactor an existing application to Spring, how to use Spring tools to make SQL database requests and REST calls, and how to secure your projects with Spring Security. Spring Start Here teaches you how to build professional-quality applications using Spring and Spring Boot. You'll start with the core components of the framework and then learn how features like Spring Boot simplify the tedious repetitive tasks you face in every project. When you're done, you'll be able to create Spring apps, secure them with authentication and authorization, and move on to the next exciting steps of your Spring journey. Spring Framework is packed with features to make your applications fast, maintainable, robust and secure. This extensive ecosystem of tools for cloud computing, microservices, and more have made it the de facto choice for building enterprise Java applications.

Spring Security in Action shows you how to use Spring Security to create applications you can be confident will withstand even the most dedicated attacks. Starting with essential “secure by design” principles, you’ll learn common software vulnerabilities and how to avoid them right from the design stage. Through hands-on projects, you’ll learn to manage system users, configure secure endpoints, and use, OAuth2 and OpenID Connect for authentication and authorization. As you go, you’ll learn how to adapt Spring Security to different architectures, such as configuring Spring Security for Reactive applications and container-based applications orchestrated with Kubernetes. When you’re done, you’ll have a complete understanding of how to use Spring Security to protect your Java enterprise applications from common threats and attacks. Key Features · The principles of secure by design · The architecture of Spring Security · Spring Security contracts for password encoding, cryptography, and authentication · Applying Spring Security to different architecture styles For experienced Java developers with knowledge of other Spring tools. About the technology Your applications, along with the data they manage, are one of your organization’s most valuable assets. No company wants their applications easily cracked by malicious attackers or left vulnerable by avoidable errors. The specialized Spring Security framework reduces the time and manpower required to create reliable authorization, authentication, and other security features for your Java enterprise software. Thanks to Spring Security, you can easily bake security into your applications, from design right through to implementation. Laurentiu Spilca is a dedicated development lead and trainer at Endava, where he leads the development of a project in the financial market of European Nordic countries. He has over ten years experience as a Java developer and technology teacher.