You’re Running Java Apps Wrong: Why Simply java -jar Is Not Enough

Most teams run Java apps with a simple java -jar app.jar and call it a day.
But the JVM is a powerful runtime with a huge set of production features that can improve performance, startup time, memory usage, diagnostics, observability, and overall stability.
In this livestream, Catherine is joined by Bruno Borges, Principal Product Manager at Microsoft, to discuss why the default way of running JVM-based applications is often not enough for real production workloads. We’ll explore which JVM settings, runtime features, and deployment practices can help you get more out of your Java apps without blindly throwing more CPU and memory at the problem.

Try out jaz: https://learn.microsoft.com/en-us/java/jaz/
Connect with Bruno: https://www.linkedin.com/in/brunocborges/

00:00 – Welcome & Introductions
00:35 – What Does Microsoft Have to Do with Java?
04:07 – The Problem with java -jar in Production
06:18 – JVM Default Ergonomics: Why 25% Heap Is a Problem
09:36 – Introducing Jaz: A Smarter JVM Launcher
12:57 – Jaz Is an Abstraction — and That's the Point
14:02 – Real Data: 20% of Production Workloads Misconfigured
17:01 – Q&A: Can Java Achieve Sub-Millisecond Latency?
18:49 – Q&A: Is It Safe to Change JVM Defaults Without Looking at Code?
21:22 – Which JVM Metrics to Check First
23:46 – Diagnostics & Observability: JFR, VisualVM, GC Toolkit
24:29 – Can AI Tune the JVM?
26:32 – Fast Startup + Low Latency + High Throughput: All Three?
27:41 – Project Leyden, AppCDS & AOT Caching Explained
30:10 – Kubernetes: CPU Boost at Startup
37:14 – The Hardcoded Xmx Problem & How Jaz Solves It
42:55 – Benchmark Results: Jaz vs. java -jar
47:16 – Jaz Roadmap: AppCDS, AI-Driven Tuning, Project Leyden
48:30 – Live Demo: java -jar vs. jaz Side by Side
55:35 – Better JVM Settings = Stop Throwing Money at Replicas
59:04 – The Developer's Role in the AI Era
1:02:24 – Rapid-Fire Round with Bruno
1:03:57 – Wrap-Up

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