poka.sh

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HPROF

Generated by scripts/gen-format-pages.py from docs/data/format-metadata/, FILE_FORMATS.csv and docs/formats-master.csv. Do not edit by hand: change the source, then run the script.

JVM HPROF Preview.

At a glance
Purpose A JVM heap dump (.hprof): top-level records of strings, classes, stack traces and heap-dump segments.
Extensions .hprof
Poka parser poka-hprof
Viewer poka-tree-viewer
Depth tier Parser with a shared viewer (see Depth tiers)
Breadth tier B4 Summary (see Breadth tiers)

How much Poka reads

B4 Summary. The container and metadata are read and summarised (counts, properties, structure), but the main content is not rendered.

Confidence: medium (the reviewer read the code). Basis: Reviewed 2026-10-26: read parsers/poka-hprof/src/main.rs (395 lines) and plugin.json. No unit tests or tests/samples.rs; the corpus has heapdump-1588683591989.hprof, read by no test. Covers .hprof. The tree reads the header (format, identifier size, capture time) and walks the top-level records, counting them by tag, summing heap-dump sizes and resolving a bounded number of class names. Judgement: B4: the dump's records are summarised, but the heap contents are not decoded.

What Poka does not read

  • Heap-dump segments are not decoded: no instances, arrays or GC roots
  • Object counts and sizes per class are not computed
  • Stack traces and threads are counted, not shown
  • Only a bounded number of class names is resolved

Libraries

Libraries Poka uses or has assessed for this format, with the status, licence and language the registry records.

  • hprof-slurp (candidate; Apache-2.0; Rust; https://github.com/agourlay/hprof-slurp) — Streaming JVM/Android heap dump analyser, mainly a CLI; reads JAVA PROFILE 1.0.1 to 1.0.3.
  • jvm-hprof (candidate; licence unconfirmed; Rust; https://docs.rs/jvm-hprof) — Library for parsing hprof files (parse_hprof); the docs.rs page does not state a licence.
  • google/hprof-parser (candidate; Apache-2.0; Go; https://github.com/google/hprof-parser) — Parses JVM .hprof dumps; author states it handles only the record types in the dumps they had.
  • scrump-format-hprof (candidate; Apache-2.0; Rust; https://github.com/avifenesh/scrump) — Java HPROF heap dump handler for scrump.; v0.1.8, updated 2026-05-20; matched on lib.rs, not tested

Sources

  • parsers/poka-hprof/src/main.rs
  • parsers/poka-hprof/plugin.json