Inside Java is a podcast for Java Developers brought to you directly from the people that make Java at Oracle. We'll discuss the language, the JVM, OpenJDK, platform security, innovation projects like Loom and Panama, and everything in between!
Curated by: Java (56 videos)
While Java programs are deployed as bytecode, performance-relevant code will be compiled, at run time, to machine code whose performance rivals that of any other platform. In the HotSpot JVM, this is the job of the just-in-time compilers C1 and C2 and between speculation and traps, inlining and constant folding, escape analysis and scalar replacement (and many more), they apply a number of heuristics, analyses, and transformations to achieve that. This requires expertise, careful research, thorough testing, and regular reevaluations of old assumptions. In this "Ask the Architects" episode of the Inside Java Podcast, recorded during JavaOne 2026, Nicolai Parlog talks to Roberto Castañeda Lozano, compiler engineer at the Java Platform Group at Oracle. "Ask the Architects" is our podcast show, where we talk to experts in OpenJDK about their work on the Java language, API, and runtime. Make sure to check https://inside.java/podcast for more episodes and the https://www.youtube.com/playlist?list=PLX8CzqL3ArzUMVSzm-z_-if8BIB55EGl4 playlist. ~~~ Chapters ~~~ 0:00 Intro 0:49 Big Picture 4:56 Tiered Compilation 10:11 Speculation & Traps 14:28 Deoptimization 16:42 Hoisting & Sinking 17:39 Heuristics 20:56 Inlining 24:21 Code Quality 27:48 Constant Folding 31:42 Escape Analysis & Scalar Replacement 36:10 Value Types 38:45 Outside Contribution 40:26 Intrinsics 42:48 Working on Compilers Tags: #Java #OpenJDK #Performance