bytedeco/javacv

OpenCV manual instalation issue

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#1,539 opened on Nov 30, 2020

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bughelp wanted

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Description

I'm using the jar files manually (because: reasons). With the previous version I had (1.4.x) it worked fine with having just OpenCV jars, but with the new one, after wasting some time, I figured out that I also needed OpenBLAS.

Why it's weird is because no unsatisfied link error is reported when not having OpenBLAS in the classpath, it simply freezes on first OpenCV call (in my case on new Mat()). There's no crash, no nothing. Probably a good idea to add some sanity checks for each module to report situations like this one.

Contributor guide

Research direction
Investigate why OpenCV freezes when OpenBLAS is missing instead of throwing an error, and add proper dependency checks or error messages for missing native libraries.
Tech stack
java
Domain
developer experience
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60