Native Image Committer and Community Meeting 2025-11-20

[wirthi]

List of all past and upcoming meetings: #3933

The meeting after this one is planned for December 18th, 2025 (a week earlier to avoid conflicting with the Christmas break). The meeting will typically be on the last Thursday of each month.

New and Noteworthy

(the list includes changes merged between ~ Oct 1st and Nov 20)

• Native Image Layers and Analysis improvements

  • [GR-70846] Ensure core types can be treated as closed #12517
    • [GR-70915] Check saturation of receiver when assigning invoke profiles. #12450
    • [GR-70018] Record virtual call targets in FactoryMethods #12302
    • [GR-70633] Ensure invokes in core methods can be devirtualized in open type world #12376
  • Infrastructure
    • [GR-71035] [GR-71036] Move DynamicHub logic to common place. #12548
    • [GR-71027] Remove ObjectToConstantFieldValueTransformer. #12460
    • [GR-66215] [GR-60254] Introduce Layered Field Value Transformer. #12291
    • [GR-71228] Reuse and extend the Standalone Analysis infrastructure #12519
    • [GR-70562] [GR-70350] Load instantiated subtypes of all base layer types #12421
    • [GR-66797] Remove LayeredImageSingleton. #12388
    • [GR-70614] Add annotation for layered compilation behavior. #12381
    • [GR-70674] Improve shadow heap scanning reason tracking. #12347
    • [GR-70085] Track fields of tracked types across layers #12343
    • [GR-67167] Add onTypeCreated analysis callback. #12322
    • [GR-69135] Second batch of singleton labeling #12304
    • [GR-69257] Cleanup field handling in points-to analysis #12282
    • [GR-66794] Switch MultiLayer ImageSingletons to Use Traits. #12268
    • [GR-65623] Implement layer compatibility check for class and module-path entries. #12264
  • Singletons and Compatibility
    • [GR-70149] Singleton labeling third batch #12530
    • [GR-66792] Switch all singletons with persist actions to SingletonTraits. #12368
    • [GR-70779] Switch AutomaticallyRegisteredImageSingletonProcessor to use SingletonTraits. #12367
    • [GR-69085] Make IsolateArgumentParser layer aware. #12307
    • [GR-70312] Get OpenTypeWorldHubLayout to pass gates. #12443
    • [GR-70014] Make native libraries layer aware #12387
    • [GR-70310] Make SingletonLayeredCallbacks use generics. #12315

• Crema

  • [GR-70201] [GR-68576] Crema: Add support for invokedynamic. #12405
    • [GR-71252] Crema: invokedynamic fixes. #12528
    • [GR-60111] Support MethodHandle & MethodType entries in crema constant pool. #12279
  • Miscellaneous
    • [GR-70623] Fix unique proxy name for unnamed package. #12498
    • [GR-71131] Fixes for Crema. #12491
    • [GR-71157] [GR-71158] Fix some exceptions during type resolution #12480
    • [GR-69628] Add new UnsupportedPlatformException For Crema. #12391
    • [GR-70691] [GR-70692] Improve JRTFS and CodeSource for native image. #12349
    • [GR-70246] Implement classData and hidden classes in crema #12317
    • [GR-70261] Crema: Fix various issues around invocation. #12310

• Terminus Project Terminus: Self-hosting Native Image #12236
  [GR-70940] Replace AnnotatedElement usages with Annotated-based access in SVM #12424
  [GR-71117] [GR-71118] [GR-71119] Migrate SubstrateGraphBuilderPlugins, Jmx*Feature and ScalaFeature to JVMCI Reflection #12512
  [GR-71092] Introduce reflective access API using JVMCI types #12476
  [GR-71224] Move JVMCI reachability API to com.oracle.svm.util #12518
  [GR-71040] Minor clean-ups related to Project Terminus #12457
  [GR-70903] Migrate DebuggerFeature from core reflection to JVMCI #12437
  [GR-70176] [GR-66234] Refactor standalone points-to analysis feature for project Terminus #12351

• Streamline reachability metadata

  • Overhaul of the reachability metadata repo
    • Overhaul of the metadata repo(10+ PRs) for GenAI test coverage.
    • Automatic tracking of new versions and corresponding tickets.
    • Ticket templates to request new libraries from GenAI
    • Migration to the new metadata format planned for 21st January 2026
  • Miscellaneous
    • [GR-71152] Remove JNIRuntimeAccess #12479
    • [GR-70564] Fix native-image-configure to properly register types from JNI sections as JNI accessed #12334

Note: please try (and test) your projects with --future-defaults=all. If need be adjust your framework with the following system properties: org.graalvm.nativeimage.future-defaults.complete-reflection-types,org.graalvm.nativeimage.future-defaults.run-time-initialize-file-system-providers, org.graalvm.nativeimage.future-defaults.run-time-initialize-security-providers.

• Usability
  [GR-70727] Add dynamic access metadata JSON file schema #12499
  [GR-68320] Track preserved elements. #12420
  [GR-69740] Move SSLContext and SSLAlgorithm to a run time. #12337
  [GR-69972] Add tracking of JDK internal methods that might require metadata to the DynamicAccessDetectionPhase #12311

• Monitoring / Tooling / Debugging
  [GR-71287] Reduce image size when using JFR. #12514 (IBM)
  [GR-71288] Reduce default JFR global buffer size to lower footprint. #12510 (IBM)
  [GR-71288] Conditionally reduce JFR global buffer defaults to lower footprint #12502 (IBM)
  [GR-71287] Reduce JFR RSS contribution by substituting method tracing and timing classes #12500 (IBM)
  [GR-70360] Fix JFR memory leak in Java event TLBs. #12295 (IBM)

• Garbage Collector / Memory Management
  [GR-71216] [GR-71222] Cleanups, refactorings, and fixes for the layouting and walking of the image heap. #12511
  [GR-71401] Verify that objects in the young generation don't have a remembered set bit. #12542
  [GR-71361] Fixes and cleanups for TLAB-related options. #12541
  [GR-54021] Do not forfeit memory for compaction due to sweeping. #12539
  [GR-71271] Don't do an incremental GC before a forced full GC with CompactingOldGen. #12513
  [GR-71223] Mark boxed primitives such as java.lang.Integer immutable. #12509
  [GR-71175] Improve error messages. #12484
  [GR-71015] Unset mark status of all objects in fixup phase. #12477
  [GR-70868] Fix wrong signature in NativeGCStackWalker. #12386
  [GR-63365] Fix GC policy timers and enable timer assertions. #12374
  [GR-70171] Add common infrastructure for native GCs such as G1. #12366
  [GR-70729] Split object arrays in ranges for marking. #12359
  [GR-70675] Fix memory leak in HeapBreakDownEntry. #12340
  [GR-70641] Use LibC.free(...) when freeing native memory that was allocated by the libc or other native code. #12326
  [GR-70010] Only call updateSizeParameters() if DynamicCollectionPolicy is used. #12265
  [GR-69717] [GR-70648] Native image: shared arena support improvements. #12383

• Other & fixes
  [GR-69116] Rename native-image-configure tool to native-image-utils. #12481
  [GR-70087] Remove support for darwin/amd64 CI jobs. #12464
  [GR-71047] Fix encoding mismatch when handling argv on Windows. #12552
  [GR-71005] Fix Encoding mismatch in JVM_GetTemporaryDirectory on Windows. #12465
  [GR-70983] Make sure StrengthenGraphsCounters are collected by the benchmarking infrastructure #12461
  [GR-70876] Add missing substitutions for scoped vector API methods. #12456
  [GR-70998] Fix shim exports for AWT on Windows. #12448
  [GR-68906] Intercept up-/downcall requests for error reporting. #12410
  [GR-65022] Economic collections. #12399
  [GR-70729] Split object arrays in ranges for marking. #12359
  [GR-70276] Fix segfault in ReleasePrimitiveArrayCritical. #12332
  [GR-70046] Cleanup code from running the image builder on classpath. #12395

Questions

Deep Dive: David Kozak: Transitive Effect Summary Analysis (TESA)

• [GR-48178] Transitive Effect Summary Analysis #12559