JVM bytecode engineering 101

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JVM bytecode engineering 101

Kees Jan Koster
kjkoster@java-monitor.com
Wednesday, November 6, 13

Wednesday, November 6, 13

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http://java-monitor.com/livedemo.html

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free, on-line service
up and running in 5 minutes
access server stats from your mobile
get help in the integrated forum

Wednesday, November 6, 13

java-monitor
probe
java-monitor
probe

java-monitor
probe
java-monitor
server
java-monitor
plugin

java-monitor
probe

java-monitor
probe

Wednesday, November 6, 13

Wednesday, November 6, 13

Wednesday, November 6, 13

Wednesday, November 6, 13

Wednesday, November 6, 13

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workflow and toolchain
JVM architecture
instruction set basics

Wednesday, November 6, 13

write in
java
compile
to .class
decompile

tweak
bootstrap
recompile
to .class
debug

Wednesday, November 6, 13

CA FE BA BE 00 04 AD 00 DA 00 .. .. ..

verifier

class loader

class

JVM

Wednesday, November 6, 13

CA FE BA BE 00 04 AD 00 DA 00 .. .. ..
0xCAFEBABE

version #

constant pool
e.g. strings

access flags
class info
fields
methods
attributes
Wednesday, November 6, 13

CA FE BA BE 00 04 AD 00 DA 00 .. .. ..
0xCAFEBABE

version #

constant pool

Transformer

e.g. strings

access flags
class info
fields
methods
attributes
Wednesday, November 6, 13

static final Logger __log = new ...

__log.info(…);

__log.info(…);

CA FE BA BE 00 04 AD 00 DA 00 .. .. ..

Transformer
CA FE BA BE 00 04 AD 00 BE 45 76 .. .. ..

verifier

class loader

class

JVM

Wednesday, November 6, 13

AspectJ

Spring

http://www.slideshare.net/tcurdt/no-dark-magic-byte-code-engineering-in-the-real-world
Wednesday, November 6, 13

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operand stack
local variables
• this pointer
stack frames and invoking methods
constant pool
atomic vs object types
exceptions

Wednesday, November 6, 13

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push 1
push 2
iadd
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Wednesday, November 6, 13

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push 1
push 2
iadd
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Wednesday, November 6, 13

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push 1
push 2
iadd
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push 1
push 2
iadd

2
1
...
...

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push 1
push 2
iadd
3
...
...

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write in
java
javap
ASMifier
bytecode plugin

compile
to .class
decompile

tweak
bootstrap
recompile
to .class
debug

Wednesday, November 6, 13

write in
java
compile
to .class
decompile

tweak
bootstrap
recompile
to .class

ASM CheckClassAdapter
debug

Wednesday, November 6, 13

nobody forced you

Wednesday, November 6, 13

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Performance van Java 8 en verder - Jeroen Borgers

Performance van Java 8 en verder - Jeroen Borgers

Introduction to Reactive with Play and Akka - Markus Jura

Introduction to Reactive with Play and Akka - Markus Jura

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Web-scale op basis van Hadoop en Akka Reactive Streams - Johan Tillema, Rene ...

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Workshop angular dart presentatie - Atos

Workshop spring boot presentatie - Atos

Workshop spring boot presentatie - Atos

Workshop spring boot presentatie - Atos

Cultivating the jenkins job jungle with groovy - Patrick van Dissel

Cultivating the jenkins job jungle with groovy - Patrick van Dissel

Cultivating the jenkins job jungle with groovy - Patrick van Dissel

Rethink your architecture - Marten Deinum

Rethink your architecture - Marten Deinum

Rethink your architecture - Marten Deinum

Evolutionary Algorithms: the key to solving complex Java puzzles! - Bas knopper

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Modularity and Domain Driven Design; a killer Combination? - Tom de Wolf & St...

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Apache Wicket: 10 jaar en verder - Martijn Dashorst

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Apache Wicket: 10 jaar en verder - Martijn Dashorst

Opening - Bert Ertman

Opening - Bert Ertman

Opening - Bert Ertman

Returning the right results - Jettro Coenradie

Returning the right results - Jettro Coenradie

Returning the right results - Jettro Coenradie

Reactive programming met Java 8 en Java EE 7 - Martijn Blankestijn

Reactive programming met Java 8 en Java EE 7 - Martijn Blankestijn

Reactive programming met Java 8 en Java EE 7 - Martijn Blankestijn

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The Raspberry Pi 5 was announced on October 2023. This new version of the popular embedded device comes with a new iteration of Broadcom’s VideoCore GPU platform, and was released with a fully open source driver stack, developed by Igalia. The presentation will discuss some of the major changes required to support this new Video Core iteration, the challenges we faced in the process and the solutions we provided in order to deliver conformant OpenGL ES and Vulkan drivers. The talk will also cover the next steps for the open source Raspberry Pi 5 graphics stack. (c) Embedded Open Source Summit 2024 April 16-18, 2024 Seattle, Washington (US) https://events.linuxfoundation.org/embedded-open-source-summit/ https://eoss24.sched.com/event/1aBEx

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In this session, we will delve into strategic approaches for optimizing knowledge management within Microsoft 365, amidst the evolving landscape of Copilot. From leveraging automatic metadata classification and permission governance with SharePoint Premium, to unlocking Viva Engage for the cultivation of knowledge and communities, you will gain actionable insights to bolster your organization's knowledge-sharing initiatives. In this session, we will also explore how to facilitate solutions to enable your employees to find answers and expertise within Microsoft 365. You will leave equipped with practical techniques and a deeper understanding of how there is more to effective knowledge management than just enabling Copilot, but building actual solutions to prepare the knowledge that Copilot and your employees can use.

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Enterprise Knowledge’s Urmi Majumder, Principal Data Architecture Consultant, and Fernando Aguilar Islas, Senior Data Science Consultant, presented "Driving Behavioral Change for Information Management through Data-Driven Green Strategy" on March 27, 2024 at Enterprise Data World (EDW) in Orlando, Florida. In this presentation, Urmi and Fernando discussed a case study describing how the information management division in a large supply chain organization drove user behavior change through awareness of the carbon footprint of their duplicated and near-duplicated content, identified via advanced data analytics. Check out their presentation to gain valuable perspectives on utilizing data-driven strategies to influence positive behavioral shifts and support sustainability initiatives within your organization. In this session, participants gained answers to the following questions: - What is a Green Information Management (IM) Strategy, and why should you have one? - How can Artificial Intelligence (AI) and Machine Learning (ML) support your Green IM Strategy through content deduplication? - How can an organization use insights into their data to influence employee behavior for IM? - How can you reap additional benefits from content reduction that go beyond Green IM?

Driving Behavioral Change for Information Management through Data-Driven Gree...

Driving Behavioral Change for Information Management through Data-Driven Gree...

Driving Behavioral Change for Information Management through Data-Driven Gree...

Enterprise Knowledge

Scaling API-first – The story of a global engineering organization

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Scaling API-first – The story of a global engineering organization

Explore 'The Codex of Business: Writing Software for Real-World Solutions,' a compelling SlideShare presentation that delves into digital transformation in healthcare. Discover through a detailed case study how Agile methodologies empower healthcare providers to develop, iterate, and refine digital solutions that address real-world challenges. Learn how strategic planning, user feedback, and continuous improvement drive success in deploying technologies that enhance patient care and operational efficiency. Ideal for healthcare professionals, IT specialists, and digital transformation advocates seeking actionable insights and practical examples of technology making a real difference.

The Codex of Business Writing Software for Real-World Solutions 2.pptx

The Codex of Business Writing Software for Real-World Solutions 2.pptx

The Codex of Business Writing Software for Real-World Solutions 2.pptx

Malak Abu Hammad

What is a good lead in your organisation? Which leads are priority? What happens to leads? When sales and marketing give different answers to these questions, or perhaps aren't sure of the answers at all, frustrations build and opportunities are left on the table. Join us for an illuminating session with Cian McLoughlin, HubSpot Principal Customer Success Manager, as we look at that crucial piece of the customer journey in which leads are transferred from marketing to sales.

04-2024-HHUG-Sales-and-Marketing-Alignment.pptx

04-2024-HHUG-Sales-and-Marketing-Alignment.pptx

04-2024-HHUG-Sales-and-Marketing-Alignment.pptx

GenCyber Cyber Security Day Presentation

GenCyber Cyber Security Day Presentation

GenCyber Cyber Security Day Presentation

Michael W. Hawkins

Microsoft's Threat Matrix for Kubernetes helps organizations understand the attack surface a Kubernetes deployment introduces to their environments. This ensures that adequate detections and mitigations are in place. By covering over 40 different attacker techniques, defenders can learn about Kubernetes-specific mitigations and controls to deploy to their environments. In this session, we will explore the MS-TA9013 Host Path Mount technique, which is commonly used by attackers to perform privilege escalation in a Kubernetes cluster. Attendees will learn how attackers and defenders can: * Escape the container's host volume mount to gain persistence on an underlying node * Move laterally from the underlying node into the customer's cloud environment * Analyze Kubernetes audit logs to detect pods deployed with a hostPath mount * Deploy an admission controller that prevents new pods from using a hostPath mount

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Puma Security, LLC

The presentation explores the development and application of artificial intelligence (AI) from its inception to its current status in the modern world. The term "artificial intelligence" was first coined by John McCarthy in 1956 to describe efforts to develop computer programs capable of performing tasks that typically require human intelligence. This concept was first introduced at a conference held at Dartmouth College, where programs demonstrated capabilities such as playing chess, proving theorems, and interpreting texts. In the early stages, Alan Turing contributed to the field by defining intelligence as the ability of a being to respond to certain questions intelligently, proposing what is now known as the Turing Test to evaluate the presence of intelligent behavior in machines. As the decades progressed, AI evolved significantly. The 1980s focused on machine learning, teaching computers to learn from data, leading to the development of models that could improve their performance based on their experiences. The 1990s and 2000s saw further advances in algorithms and computational power, which allowed for more sophisticated data analysis techniques, including data mining. By the 2010s, the proliferation of big data and the refinement of deep learning techniques enabled AI to become mainstream. Notable milestones included the success of Google's AlphaGo and advancements in autonomous vehicles by companies like Tesla and Waymo. A major theme of the presentation is the application of generative AI, which has been used for tasks such as natural language text generation, translation, and question answering. Generative AI uses large datasets to train models that can then produce new, coherent pieces of text or other media. The presentation also discusses the ethical implications and the need for regulation in AI, highlighting issues such as privacy, bias, and the potential for misuse. These concerns have prompted calls for comprehensive regulations to ensure the safe and equitable use of AI technologies. Artificial intelligence has also played a significant role in healthcare, particularly highlighted during the COVID-19 pandemic, where it was used in drug discovery, vaccine development, and analyzing the spread of the virus. The capabilities of AI in healthcare are vast, ranging from medical diagnostics to personalized medicine, demonstrating the technology's potential to revolutionize fields beyond just technical or consumer applications. In conclusion, AI continues to be a rapidly evolving field with significant implications for various aspects of society. The development from theoretical concepts to real-world applications illustrates both the potential benefits and the challenges that come with integrating advanced technologies into everyday life. The ongoing discussion about AI ethics and regulation underscores the importance of managing these technologies responsibly to maximize their their benefits while minimizing potential harms.

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As privacy and data protection regulations evolve rapidly, organizations operating in multiple jurisdictions face mounting challenges to ensure compliance and safeguard customer data. With state-specific privacy laws coming up in multiple states this year, it is essential to understand what their unique data protection regulations will require clearly. How will data privacy evolve in the US in 2024? How to stay compliant? Our panellists will guide you through the intricacies of these states' specific data privacy laws, clarifying complex legal frameworks and compliance requirements. This webinar will review: - The essential aspects of each state's privacy landscape and the latest updates - Common compliance challenges faced by organizations operating in multiple states and best practices to achieve regulatory adherence - Valuable insights into potential changes to existing regulations and prepare your organization for the evolving landscape

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Choosing the right accounts payable services provider is a strategic decision that can significantly impact your business's financial performance and operational efficiency. By considering factors such as expertise, range of services, technology infrastructure, scalability, cost, and reputation, businesses can make informed decisions and select a provider that aligns with their unique needs and objectives. Partnering with the right provider can streamline accounts payable processes, drive cost savings, and position your business for long-term success. https://katprotech.com/accounts-payable-and-purchase-order-automation/

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In an era where artificial intelligence (AI) stands at the forefront of business innovation, Information Architecture (IA) is at the core of functionality. See “There’s No AI Without IA” – (from 2016 but even more relevant today) Understanding and leveraging how Information Architecture (IA) supports AI synergies between knowledge engineering and prompt engineering is critical for senior leaders looking to successfully deploy AI for internal and externally facing knowledge processes. This webinar be a high-level overview of the methodologies that can elevate AI-driven knowledge processes supporting both employees and customers. Core Insights Include: Strategic Knowledge Engineering: Delve into how structuring AI's knowledge base is required to prevent hallucinations, enable contextual retrieval of accurate information. This will include discussion of gold standard libraries of use cases support testing various LLMs and structures and configurations of knowledge base. Precision in Prompt Engineering: Learn the art of crafting prompts that direct AI to deliver targeted, relevant responses, thereby optimizing customer experiences and business outcomes. Unified Approach for Enhanced AI Performance: Explore the intersection of knowledge and prompt engineering to develop AI systems that are not only more responsive but also aligned with overarching business strategies. Guiding Principles for Implementation: Equip yourself with best practices, ethical guidelines, and strategic considerations for embedding these technologies into your business ecosystem effectively. This webinar is designed to empower business and technology leaders with the knowledge to harness the full potential of AI, ensuring their organizations not only keep pace with digital transformation but lead the charge. Join us to map a roadmap to fully leverage Information Architecture (IA) and AI chart a course towards a future where AI is a key pillar of strategic innovation and business success.

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Earley Information Science

Real Time Object Detection Using Open CV

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The Digital Insurer

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Strategies for Unlocking Knowledge Management in Microsoft 365 in the Copilot...

Strategies for Unlocking Knowledge Management in Microsoft 365 in the Copilot...

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The Codex of Business Writing Software for Real-World Solutions 2.pptx

The Codex of Business Writing Software for Real-World Solutions 2.pptx

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GenCyber Cyber Security Day Presentation

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Artificial Intelligence: Facts and Myths

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JVM bytecode engineering 101

1. JVM bytecode engineering 101 Kees Jan Koster kjkoster@java-monitor.com Wednesday, November 6, 13

2. Wednesday, November 6, 13

3. • http://java-monitor.com/livedemo.html • • • • free, on-line service up and running in 5 minutes access server stats from your mobile get help in the integrated forum Wednesday, November 6, 13

4. java-monitor probe java-monitor probe java-monitor probe java-monitor server java-monitor plugin java-monitor probe java-monitor probe Wednesday, November 6, 13

5. Wednesday, November 6, 13

6. Wednesday, November 6, 13

7. Wednesday, November 6, 13

8. Wednesday, November 6, 13

9. • • • workflow and toolchain JVM architecture instruction set basics Wednesday, November 6, 13

10. write in java compile to .class decompile tweak bootstrap recompile to .class debug Wednesday, November 6, 13

11. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. verifier class loader class JVM Wednesday, November 6, 13

12. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. 0xCAFEBABE version # constant pool e.g. strings access flags class info fields methods attributes Wednesday, November 6, 13

13. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. 0xCAFEBABE version # constant pool Transformer e.g. strings access flags class info fields methods attributes Wednesday, November 6, 13 static final Logger __log = new ... __log.info(…); __log.info(…);

14. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. Transformer CA FE BA BE 00 04 AD 00 BE 45 76 .. .. .. verifier class loader class JVM Wednesday, November 6, 13

15. AspectJ Spring http://www.slideshare.net/tcurdt/no-dark-magic-byte-code-engineering-in-the-real-world Wednesday, November 6, 13

16. • • • • • • operand stack local variables • this pointer stack frames and invoking methods constant pool atomic vs object types exceptions Wednesday, November 6, 13

17. • • • push 1 push 2 iadd ... ... Wednesday, November 6, 13

18. • • • push 1 push 2 iadd ... ... Wednesday, November 6, 13

19. • • • push 1 push 2 iadd 1 ... ... Wednesday, November 6, 13

20. • • • push 1 push 2 iadd 2 1 ... ... Wednesday, November 6, 13

21. • • • push 1 push 2 iadd 3 ... ... Wednesday, November 6, 13

22. write in java javap ASMifier bytecode plugin compile to .class decompile tweak bootstrap recompile to .class debug Wednesday, November 6, 13

23. write in java compile to .class decompile tweak bootstrap recompile to .class ASM CheckClassAdapter debug Wednesday, November 6, 13

24. nobody forced you Wednesday, November 6, 13